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Assembly Source File | 1992-01-17 | 206KB | 7,178 lines

; Generic assembler routines having to do with video adapter ; ; ---- Video Routines ; ; setvideomode() ; setvideotext() ; getcolor() ; putcolor() ; out_line() ; drawbox() ; home() ; movecursor() ; keycursor() ; putstring() ; setattr() ; scrollup() ; scrolldown() ; putstr() ; loaddac() ; spindac() ; adapter_init ; adapter_detect ; setnullvideo ; ; ---- Help (Video) Support ; ; setfortext() ; setforgraphics() ; setclear() ; findfont() ; ; required for compatibility if Turbo ASM IFDEF ??version MASM51 QUIRKS ENDIF .MODEL medium,c .8086 ; these must NOT be in any segment!! ; this get's rid of TURBO-C fixup errors extrn startvideo:far ; start your-own-video routine extrn readvideo:far ; read your-own-video routine extrn writevideo:far ; write your-own-video routine extrn endvideo:far ; end your-own-video routine extrn readvideopalette:far ; read-your-own-palette routine extrn writevideopalette:far ; write-your-own-palette routine extrn startdisk:far ; start disk-video routine extrn readdisk:far ; read disk-video routine extrn writedisk:far ; write disk-video routine extrn enddisk:far ; end disk-video routine extrn buzzer:far ; nyaah, nyaah message extrn getakey:far ; for keycursor routine extrn keypressed:far ; ... ; TARGA 28 May 80 - j mclain extrn StartTGA :far ; start TARGA extrn ReadTGA :far ; read TARGA extrn WriteTGA :far ; write TARGA extrn EndTGA :far ; end TARGA extrn ReopenTGA :far ; restart TARGA ; TARGA+ Mark Peterson 2-12-91 extrn MatchTPlusMode:far extrn CheckForTPlus:far extrn WriteTPlusBankedPixel:far extrn ReadTPlusBankedPixel:far extrn TPlusLUT:far ; 8514/A routines extrn open8514 :far ; start 8514a extrn reopen8514:far ; restart 8514a extrn close8514 :far ; stop 8514a extrn fr85wdot :far ; 8514a write dot extrn fr85wbox :far ; 8514a write box extrn fr85rdot :far ; 8514a read dot extrn fr85rbox :far ; 8514a read box extrn w8514pal :far ; 8514a pallete update ; Hercules Routines extrn inithgc :far ; Initialize Hercules card graphics mode extrn termhgc :far ; Terminate Hercules card graphics mode extrn writehgc :far ; Hercules write dot extrn readhgc :far ; Hercules read dot ; setforgraphics/setfortext textsafe=save extrn savegraphics :far extrn restoregraphics :far .DATA ; ************************ External variables ***************************** extrn oktoprint: word ; flag: == 1 if printf() will work extrn videoentry:byte ; video table entry flag extrn dotmode: word ; video mode (see the comments ; in front of the internal video ; table for legal dot modes) extrn textsafe2: word ; textsafe over-ride from videotable extrn sxdots:word,sydots:word ; physical screen number of dots extrn sxoffs:word,syoffs:word ; logical screen top left extrn colors:word ; colors extrn cyclelimit:word ; limiting factor for DAC-cycler extrn debugflag:word ; for debugging purposes only extrn boxcount:word ; (previous) box pt counter: 0 if none. extrn boxx:word, boxy:word ; zoom-box save-value locations extrn boxvalues:byte ; zoom-box save-pixel locations extrn xorTARGA:word ; TARGA 3 June 89 j mclain ; flag says xor pixels for box extrn cpu:word ; CPU type (86, 186, 286, or 386) extrn extraseg:word ; location of the EXTRA segment extrn suffix:word ; (safe place during video-mode switches) extrn swaplength:word ; savegraphics/restoregraphics stuff extrn swapoffset:dword ; ... extrn swapvidbuf:dword ; ... extrn swaptotlen:dword ; ... extrn rotate_lo:word, rotate_hi:word extrn bios_palette:word extrn paldata:byte extrn xdots:word extrn ydots:word extrn colors:word extrn NonInterlaced:word extrn PixelZoom:word extrn MaxColorRes:word extrn TPlusFlag:WORD ; TARGA+ Mark Peterson 2-12-91 ; ************************ Public variables ***************************** public andcolor ; used by 'calcmand' public videotable public loadPalette ; flag for loading VGA/TARGA palette from disk public dacbox ; GIF saves use this public daclearn, daccount ; Rotate may want to use this public rowcount ; row-counter for decoder and out_line public gotrealdac ; loaddac worked, really got a dac public reallyega ; "really an EGA" (faking a VGA) flag public diskflag ; disk video active flag public video_type ; video adapter type public svga_type ; SuperVGA video adapter type public mode7text ; for egamono and hgc public textaddr ; text segment public textsafe ; setfortext/setforgraphics logic public boxcolor ; zoom box color public goodmode ; video mode ok? public text_type ; current mode's type of text public textrow ; current row in text mode public textcol ; current column in text mode public textrbase ; textrow is relative to this public textcbase ; textcol is relative to this public color_dark ; darkest color in palette public color_bright ; brightest color in palette public color_medium ; nearest to medbright grey in palette public swapsetup ; for savegraphics/restoregraphics public TPlusInstalled public vesa_detect ; set to 1 to disable VESA-detection ; arrays declared here, used elsewhere ; arrays not used simultaneously are deliberately overlapped ; ************************ Internal variables ***************************** vxdots dw 0 ; virtual scan line length (bytes) goodmode dw 0 ; if non-zero, OK to read/write pixels dotwrite dw 0 ; write-a-dot routine: mode-specific dotread dw 0 ; read-a-dot routine: mode-specific linewrite dw 0 ; write-a-line routine: mode-specific lineread dw 0 ; read-a-line routine: mode-specific swapsetup dd 0 ; setfortext/graphics setup routine andcolor dw 0 ; "and" value used for color selection color db 0 ; the color to set a pixel videoflag db 0 ; special "your-own-video" flag tgaflag db 0 ; TARGA 28 May 89 - j mclain loadPalette db 0 ; TARGA/VGA load palette from disk f85flag db 0 ;flag for 8514a HGCflag db 0 ;flag for Hercules Graphics Adapter TPlusInstalled dw 0 xga_pos_base dw 0 ; MCA Pos Base value xga_cardid dw 0 ; MCA Card ID value xga_reg_base dw -1 ; XGA IO Reg Base (-1 means dunno yet) xga_1mb dd 0 ; XGA 1MB aperture address xga_4mb dd 0 ; XGA 4MB aperture address xga_result dw 0 ; XGA_detect result code xga_isinmode dw 0 ; XGA is in this mode right now xga_iscolors dw 0 ; XGA using this many colors (0=64K) xga_clearvideo db 0 ; set to 80h to prevent video-clearing xga_loaddac db 0 ; set to 1 to load 'dacbox' on modesw xga_xdots dw 0 ; pixels per scan line align 2 tmpbufptr dd 0 color_dark dw 0 ; darkest color in palette color_bright dw 0 ; brightest color in palette color_medium dw 0 ; nearest to medbright grey in palette ; ; Zoom-Box values (2K x 2K screens max) boxcolor dw 0 ; Zoom-Box color reallyega dw 0 ; 1 if its an EGA posing as a VGA gotrealdac dw 0 ; 1 if loaddac has a dacbox diskflag dw 0 ; special "disk-video" flag palettega db 17 dup(0) ; EGA palette registers go here daclearn db 0 ; 0 if "learning" DAC speed dacnorm db 0 ; 0 if "normal" DAC update daccount dw 0 ; DAC registers to update in 1 pass dacbox db 773 dup(0) ; DAC goes here ;;saved_dacreg dw 0ffffh,0,0,0 ; saved DAC register goes here orvideo db 0 ; "or" value for setvideo align 2 rowcount dw 0 ; row-counter for decoder and out_line videomem dw 0a000h ; VGA videomemory videoax dw 0 ; graphics mode values: ax videobx dw 0 ; graphics mode values: bx videocx dw 0 ; graphics mode values: cx videodx dw 0 ; graphics mode values: dx video_type dw 0 ; actual video adapter type: ; 0 = type not yet determined ; 1 = Hercules ; 2 = CGA (assumed if nothing else) ; 3 = EGA ; 4 = MCGA ; 5 = VGA ; 6 = VESA (not yet checked) ; 11 = 8514/A (not yet checked) ; 12 = TIGA (not yet checked) ; 13 = TARGA (not yet checked) svga_type dw 0 ; (forced) SVGA type ; 1 = ahead "A" type ; 2 = ATI ; 3 = C&T ; 4 = Everex ; 5 = Genoa ; 6 = Ncr ; 7 = Oak-Tech ; 8 = Paradise ; 9 = Trident ; 10 = Tseng 3000 ; 11 = Tseng 4000 ; 12 = Video-7 ; 13 = ahead "B" type ; 14 = "null" type (for testing only) mode7text dw 0 ; nonzero for egamono and hgc textaddr dw 0b800h ; b800 for mode 3, b000 for mode 7 textsafe dw 0 ; 0 = default, runup chgs to 1 ; 1 = yes ; 2 = no, use 640x200 ; 3 = bios, yes plus use int 10h-1Ch ; 4 = save, save entire image text_type dw 0 ; current mode's type of text: ; 0 = real text, mode 3 (or 7) ; 1 = 640x200x2, mode 6 ; 2 = some other mode, graphics video_entries dw 0 ; offset into video_entries table video_bankadr dw 0 ; offset of video_banking routine video_bankseg dw 0 ; segment of video_banking routine textrow dw 0 ; for putstring(-1,...) textcol dw 0 ; for putstring(..,-1,...) textrbase dw 0 ; textrow is relative to this textcbase dw 0 ; textcol is relative to this cursortyp dw 0 tandyseg dw ? ;Tandy 1000 video segment address tandyofs dw ? ;Tandy 1000 Offset into video buffer tandyscan dw ? ;Tandy 1000 scan line address pointer ; ******************* "Tweaked" VGA mode variables ************************ ; 704 x 528 mode x704y528 db 704/8 ; number of screen columns db 528/16 ; number of screen rows db 68h, 57h, 58h, 8Bh ; CRTC Registers db 59h, 86h, 3EH,0F0h db 0h, 60h, 0h, 0h db 0h, 0h, 2h, 3Dh db 19h, 8Bh, 0Fh, 2Ch db 0h, 18h, 38h,0E3h db 0FFh ; 720 x 540 mode x720y540 db 720/8 ; number of screen columns db 540/16 ; number of screen rows db 6Ah, 59h, 5Ah, 8Dh ; CRTC Registers db 5Eh, 8Bh, 4AH,0F0h db 0h, 60h, 0h, 0h db 0h, 0h, 2h, 49h db 24h, 86h, 1Bh, 2Dh db 0h, 24h, 44h,0E3h db 0FFh ; 736 x 552 mode x736y552 db 736/8 ; number of screen columns db 552/16 ; number of screen rows db 6Ch, 5Bh, 5Ch, 8Fh ; CRTC Registers db 5Fh, 8Ch, 56H,0F0h db 0h, 60h, 0h, 0h db 0h, 0h, 2h, 55h db 2Bh, 8Dh, 27h, 2Eh db 0h, 30h, 50h,0E3h db 0FFh ; 752 x 564 mode x752y564 db 752/8 ; number of screen columns db 564/16 ; number of screen rows db 6Eh, 5Dh, 5Eh, 91h ; CRTC Registers db 62h, 8Fh, 62H,0F0h db 0h, 60h, 0h, 0h db 0h, 0h, 2h, 61h db 37h, 89h, 33h, 2Fh db 0h, 3Ch, 5Ch,0E3h db 0FFh ; 768 x 576 mode x768y576 db 768/8 ; number of screen columns db 576/16 ; number of screen rows db 70h, 5Fh, 60h, 93h ; CRTC Registers db 66h, 93h, 6EH,0F0h db 0h, 60h, 0h, 0h db 0h, 0h, 2h, 6Dh db 43h, 85h, 3Fh, 30h db 0h, 48h, 68h,0E3h db 0FFh ; 784 x 588 mode x784y588 db 784/8 ; number of screen columns db 588/16 ; number of screen rows db 72h, 61h, 62h, 95h ; CRTC Registers db 69h, 96h, 7AH,0F0h db 0h, 60h, 0h, 0h db 0h, 0h, 2h, 79h db 4Fh, 81h, 4Bh, 31h db 0h, 54h, 74h,0E3h db 0FFh ; 800 x 600 mode x800y600 db 800/8 ; number of screen columns db 600/16 ; number of screen rows db 74h, 63h, 64h, 97h ; CRTC Registers db 68h, 95h, 86H,0F0h db 0h, 60h, 0h, 0h db 0h, 0h, 2h, 85h db 5Bh, 8Dh, 57h, 32h db 0h, 60h, 80h,0E3h db 0FFh x360y480 db 360/8 ; number of screen columns db 480/16 ; number of screen rows db 6bh, 59h, 5ah, 8eh ; CRTC Registers db 5eh, 8ah, 0DH,03Eh db 0h, 40h, 00h, 0h db 0h, 0h, 0h, 31h db 0EAh, 0ACh, 0DFh, 2Dh db 0h,0E7h, 06h,0E3h db 0FFh x320y480 db 320/8 ; number of screen columns db 480/16 ; number of screen rows db 5fh, 4fh, 50h, 82h ; CRTC Registers db 54h, 80h, 0DH,03Eh db 0h, 40h, 00h, 0h db 0h, 0h, 0h, 0h db 0EAh, 0AEh, 0DFh, 28h db 0h,0E7h, 006h,0E3h db 0FFh ; mode x from Michael Abrash x320y240 db 320/8 ; number of screen columns db 240/16 ; number of screen rows db 05fh, 04fh, 050h, 082h db 054h, 080h, 0dh, 03eh db 00h, 041h, 00h, 00h db 00h, 00h, 00h, 00h db 0eah, 0ach, 0dfh, 028h db 00h, 0e7h, 06h, 0e3h db 0ffh x320y400 db 320/8 ; number of screen columns db 400/16 ; number of screen rows db 5fh, 4fh, 50h, 82h ; CRTC Registers db 54h, 80h,0bfh, 1fh db 00h, 40h, 00h, 00h db 00h, 00h, 00h, 00h db 9ch, 8eh, 8fh, 28h db 00h, 96h,0b9h,0E3h db 0FFh x640y400 db 640/8 ; number of screen columns db 400/16 ; number of screen rows db 5eh, 4fh, 50h, 01h ; CRTC Registers db 54h, 9fh,0c0h, 1fh db 00h, 40h, 00h, 00h db 00h, 00h, 00h, 00h db 9ch,08eh, 8fh, 28h db 00h, 95h,0bch,0c3h db 0ffh ;for VGA x400y600 db 400/8 db 600/16 db 74h,63h,64h,97h db 68h,95h,86h,0F0h db 00h,60h,00h,00h db 00h,00h,00h,31h db 5Bh,8Dh,57h,32h db 0h,60h,80h,0E3h db 0FFh ;for VGA x376y564 db 376/8 db 564/16 db 6eh,5dh,5eh,91h db 62h,8fh,62h,0F0h db 00h,60h,00h,00h db 00h,00h,00h,31h db 37h,89h,33h,2fh db 0h,3ch,5ch,0E3h db 0FFh ;for VGA x400y564 db 400/8 db 564/16 db 74h,63h,64h,97h db 68h,95h,62h,0F0h db 00h,60h,00h,00h db 00h,00h,00h,31h db 37h,89h,33h,32h db 0h,3ch,5ch,0E3h db 0FFh testati db 832/8 db 612/16 db 7dh,65h,68h,9fh db 69h,92h,44h,1Fh db 00h,00h,00h,00h db 00h,00h,00h,00h db 34h,86h,37h,34h db 0fh,34h,40h,0E7h db 0FFh align 2 tweaks dw offset x704y528 ; tweak table dw offset x704y528 dw offset x720y540 dw offset x736y552 dw offset x752y564 dw offset x768y576 dw offset x784y588 dw offset x800y600 dw offset x360y480 dw offset x320y400 dw offset x640y400 ; Tseng Super VGA dw offset x400y600 ; new tweak (VGA) dw offset x376y564 ; new tweak (VGA) dw offset x400y564 ; new tweak (VGA) dw offset x720y540 ; ATI Tweak dw offset x736y552 ; ATI Tweak dw offset x752y564 ; ATI Tweak dw offset testati ; ATI 832x816 (works!) dw offset x320y480 dw offset x320y240 tweakflag dw 0 ; tweak mode active flag tweaktype dw 0 ; 8 or 9 (320x400 or 360x480) bios_vidsave dw 0 ; for setfortext/graphics .CODE FRAME MACRO regs push bp mov bp, sp IRP reg, <regs> push reg ENDM ENDM UNFRAME MACRO regs IRP reg, <regs> pop reg ENDM pop bp ENDM ; Video Table Entries ; ; The Video Table has been moved to a FARDATA segment to relieve ; some of the pressure on the poor little overloaded 64K DATA segment. .code video_requirements dw 0 ; minimal video_type req'd dw 1, 3, 4, 5, 5, 5, 5, 5, 1, 1 ; dotmodes 1 - 10 dw 1, 5, 2, 1, 5, 5, 5, 5, 1, 5 ; dotmodes 11 - 20 dw 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 ; dotmodes 21 - 30 videotable label byte ; video table actually starts on the NEXT byte ; Feel free to add your favorite video adapter to FRACTINT.CFG. ; The entries hard coded here are repeated from fractint.cfg in case ; it gets lost/destroyed, so a user can still have some modes. ; Currently available Video Modes are (use the BIOS as a last resort) ; 1) use the BIOS (INT 10H, AH=12/13, AL=color) ((SLOW)) ; 2) pretend it's a (perhaps super-res) EGA/VGA ; 3) pretend it's an MCGA ; 4) SuperVGA 256-Color mode using the Tseng Labs Chipset ; 5) SuperVGA 256-Color mode using the Paradise Chipset ; 6) SuperVGA 256-Color mode using the Video-7 Chipset ; 7) Non-Standard IBM VGA 360 x 480 x 256-Color mode ; 8) SuperVGA 1024x768x16 mode for the Everex Chipset ; 9) TARGA video modes ; 10) HERCULES video mode ; 11) Non-Video [disk or RAM] "video" ; 12) 8514/A video modes ; 13) CGA 320x200x4-color and 640x200x2-color modes ; 14) Tandy 1000 video modes ; 15) SuperVGA 256-Color mode using the Trident Chipset ; 16) SuperVGA 256-Color mode using the Chips & Tech Chipset ; 17) SuperVGA 256-Color mode using the ATI VGA Wonder Chipset ; 18) SuperVGA 256-Color mode using the Everex Chipset ; 19) Roll-Your-Own video, as defined in YOURVID.C ; 20) SuperVGA 1024x768x16 mode for the ATI VGA Wonder Chipset ; 21) SuperVGA 1024x768x16 mode for the Tseng Labs Chipset ; 22) SuperVGA 1024x768x16 mode for the Trident Chipset ; 23) SuperVGA 1024x768x16 mode for the Video 7 Chipset ; 24) SuperVGA 1024x768x16 mode for the Paradise Chipset ; 25) SuperVGA 1024x768x16 mode for the Chips & Tech Chipset ; 26) SuperVGA 1024x768x16 mode for the Everex Chipset ; 27) SuperVGA Auto-Detect mode ; 28) VESA modes ; 29) True Color Auto-Detect ; (Several entries have been commented out - they should/did work, ; but are handled by alternative entries. Where multiple SuperVGA ; entries are covered by a single SuperVGA Autodetect mode, the ; individual modes have been commented out. Where a SuperVGA ; Autodetect mode covers only one brand of adapter, the Autodetect ; mode has been commented out to avoid confusion.) ; |--Adapter/Mode-Name------|-------Comments-----------| ; |------INT 10H------|Dot-|--Resolution---| ; |key|--AX---BX---CX---DX|Mode|--X-|--Y-|Color| db "IBM 16-Color EGA ",0,"Standard EGA hi-res mode ",0 dw 1060, 10h, 0, 0, 0, 2, 640, 350, 16 db "IBM 256-Color VGA/MCGA ",0,"Quick and LOTS of colors ",0 dw 1061, 13h, 0, 0, 0, 3, 320, 200, 256 db "IBM 16-Color VGA ",0,"Nice high resolution ",0 dw 1062, 12h, 0, 0, 0, 2, 640, 480, 16 db "IBM 4-Color CGA ",0,"(Ugh - Yuck - Bleah) ",0 dw 1063, 4h, 0, 0, 0, 13, 320, 200, 4 db "IBM Hi-Rez B&W CGA ",0,"('Hi-Rez' Ugh - Yuck) ",0 dw 1064, 6h, 0, 0, 0, 13, 640, 200, 2 db "IBM B&W EGA ",0,"(Monochrome EGA) ",0 dw 1065, 0fh, 0, 0, 0, 2, 640, 350, 2 db "IBM B&W VGA ",0,"(Monochrome VGA) ",0 dw 1066, 11h, 0, 0, 0, 2, 640, 480, 2 db "IBM Low-Rez EGA ",0,"Quick but chunky ",0 dw 1067, 0dh, 0, 0, 0, 2, 320, 200, 16 db "IBM VGA (non-std) ",0,"Register Compatibles ONLY",0 dw 1068, 0h, 0, 0, 9, 7, 320, 400, 256 db "IBM VGA (non-std) ",0,"Register Compatibles ONLY",0 dw 1084, 0h, 0, 0, 8, 7, 360, 480, 256 db "SuperVGA/VESA Autodetect ",0,"Works with most SuperVGA ",0 dw 1085, 0, 0, 0, 0, 27, 800, 600, 16 db "SuperVGA/VESA Autodetect ",0,"Works with most SuperVGA ",0 dw 1086, 0, 0, 0, 0, 27,1024, 768, 16 db "SuperVGA/VESA Autodetect ",0,"Works with most SuperVGA ",0 dw 1087, 0, 0, 0, 0, 27, 640, 400, 256 db "SuperVGA/VESA Autodetect ",0,"Works with most SuperVGA ",0 dw 1088, 0, 0, 0, 0, 27, 640, 480, 256 db "SuperVGA/VESA Autodetect ",0,"Works with most SuperVGA ",0 dw 1089, 0, 0, 0, 0, 27, 800, 600, 256 db "SuperVGA/VESA Autodetect ",0,"Works with most SuperVGA ",0 dw 1090, 0, 0, 0, 0, 27,1024, 768, 256 db "VESA Standard interface ",0,"OK: Andy Fu - Chips&Tech ",0 dw 1091,4f02h,106h, 0, 0, 28,1280,1024, 16 db "VESA Standard interface ",0,"OK: Andy Fu - Chips&Tech ",0 dw 1092,4f02h,107h, 0, 0, 28,1280,1024, 256 db "8514/A Low Res ",0,"Requires IBM's HDILOAD ",0 dw 1093, 3h, 0, 0, 1, 12, 640, 480, 256 db "8514/A High Res ",0,"Requires IBM's HDILOAD ",0 dw 1094, 3h, 0, 0, 1, 12,1024, 768, 256 db "8514/A Low W/Border ",0,"Requires IBM's HDILOAD ",0 dw 1095, 3h, 0, 0, 1, 12, 632, 474, 256 db "8514/A High W/Border ",0,"Requires IBM's HDILOAD ",0 dw 1096, 3h, 0, 0, 1, 12,1016, 762, 256 db "IBM Med-Rez EGA ",0,"(Silly but it's there!) ",0 dw 1097, 0eh, 0, 0, 0, 2, 640, 200, 16 db "IBM VGA (non-std) ",0,"Register Compatibles ONLY",0 dw 1098, 0h, 0, 0, 18, 7, 320, 480, 256 db "Hercules Graphics ",0,"OK: Timothy Wegner ",0 dw 1099, 8h, 0, 0, 0, 10, 720, 348, 2 db "Tandy 1000 ",0,"OK: Joseph Albrecht ",0 dw 1100, 9h, 0, 0, 0, 14, 320, 200, 16 db "Pdise/AST/COMPAQ VGA ",0,"OK: Phil Wilson ",0 dw 1101, 59h, 0, 0, 0, 1, 800, 600, 2 db 140 dup(0) ; 2 unused slots here default table db "Disk/RAM 'Video' ",0,"Full-Page L-Jet @ 75DPI ",0 dw 1104, 3h, 0, 0, 0, 11, 800, 600, 2 db "Disk/RAM 'Video' ",0,"Full-Page L-Jet @ 150DPI ",0 dw 1105, 3h, 0, 0, 0, 11,1600,1200, 2 db "Disk/RAM 'Video' ",0,"Full-Page Epson @ 120DPI ",0 dw 1106, 3h, 0, 0, 0, 11, 768, 960, 2 db "Disk/RAM 'Video' ",0,"Full-Page Paintjet 90DPI ",0 dw 1107, 3h, 0, 0, 0, 11, 960, 720, 256 db "Disk/RAM 'Video' ",0,"For Background Fractals ",0 dw 1108, 3h, 0, 0, 0, 11, 800, 600, 256 db "Disk/RAM 'Video' ",0,"For Background Fractals ",0 dw 1109, 3h, 0, 0, 0, 11,2048,2048, 256 db 280 dup(0) ; 4 unused slots here default table db 70 dup(0) ; 1 slot reserved for unassigned current mode bios_savebuf db 256 dup(0) ; enough for 4 blocks (64 bytes/block) .code ; XGA Graphics mode setup values ; (the first two entries in each line ; indicate where the table values are to be stored) ; ; 1024x768x256 vvv ; 1024x768x16 -----vvvv ; 640x480x256 -----------vvvv ; 640x480x65536 ----------------vvvv ; 800x600x16 -----------------------vvvv ; 800x600x256 -----------------------------vvvv ; 800x600x65536 ----------------------------------vvvv xga_twidth dw 9 ; width of these tables xga_requir dw 0, 0, 0dh, 05h, 01h, 09h, 01h, 01h, 09h ; adapter requirements xga_colors dw 0, 0, 256, 16, 256, 0, 16, 256, 0 ; 0 means 64K colors xga_swidth dw 0, 0, 1024, 512, 640, 1280, 400, 800, 1600 ; bytes / scan line xga_val db 004h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; interrupt enable db 005h, 000h, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh ; interrupt status db 000h, 000h, 004h, 004h, 004h, 004h, 004h, 004h, 004h ; operating mode db 00ah, 064h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; palette mask db 001h, 000h, 001h, 001h, 001h, 001h, 001h, 001h, 001h ; vid mem aper cntl db 008h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; vid mem aper indx db 006h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; virt mem ctl db 009h, 000h, 003h, 002h, 003h, 004h, 002h, 003h, 004h ; mem access mode db 00ah, 050h, 001h, 001h, 001h, 001h, 001h, 001h, 001h ; disp mode 1 db 00ah, 050h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; disp mode 1 db 00ah, 010h, 09dh, 09dh, 063h, 063h, 088h, 088h, 088h ; horiz tot lo. db 00ah, 011h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; horiz tot hi. db 00ah, 012h, 07fh, 07fh, 04fh, 04fh, 063h, 063h, 063h ; hor disp end lo db 00ah, 013h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; hor disp end hi db 00ah, 014h, 080h, 080h, 050h, 050h, 064h, 064h, 064h ; hor blank start lo db 00ah, 015h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; hor blank start hi db 00ah, 016h, 09ch, 09ch, 062h, 062h, 087h, 087h, 087h ; hor blank end lo db 00ah, 017h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; hor blank end hi db 00ah, 018h, 087h, 087h, 055h, 055h, 06ah, 06ah, 06ah ; hor sync start lo db 00ah, 019h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; hor sync start hi db 00ah, 01ah, 09ch, 09ch, 061h, 061h, 084h, 084h, 084h ; hor sync end lo db 00ah, 01bh, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; hor sync end hi db 00ah, 01ch, 040h, 040h, 000h, 000h, 000h, 000h, 000h ; hor sync pos db 00ah, 01eh, 004h, 004h, 000h, 000h, 000h, 000h, 000h ; hor sync pos db 00ah, 020h, 030h, 030h, 00ch, 00ch, 086h, 086h, 086h ; vert tot lo db 00ah, 021h, 003h, 003h, 002h, 002h, 002h, 002h, 002h ; vert tot hi db 00ah, 022h, 0ffh, 0ffh, 0dfh, 0dfh, 057h, 057h, 057h ; vert disp end lo db 00ah, 023h, 002h, 002h, 001h, 001h, 002h, 002h, 002h ; vert disp end hi db 00ah, 024h, 000h, 000h, 0e0h, 0e0h, 058h, 058h, 058h ; vert blank start lo db 00ah, 025h, 003h, 003h, 001h, 001h, 002h, 002h, 002h ; vert blank start hi db 00ah, 026h, 02fh, 02fh, 00bh, 00bh, 085h, 085h, 085h ; vert blank end lo db 00ah, 027h, 003h, 003h, 002h, 002h, 002h, 002h, 002h ; vert blank end hi db 00ah, 028h, 000h, 000h, 0eah, 0eah, 058h, 058h, 058h ; vert sync start lo db 00ah, 029h, 003h, 003h, 001h, 001h, 002h, 002h, 002h ; vert sync start hi db 00ah, 02ah, 008h, 008h, 0ech, 0ech, 06eh, 06eh, 06eh ; vert sync end db 00ah, 02ch, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh ; vert line comp lo db 00ah, 02dh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh ; vert line comp hi db 00ah, 036h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; sprite cntl db 00ah, 040h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; start addr lo db 00ah, 041h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; start addr me db 00ah, 042h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; start addr hi db 00ah, 043h, 080h, 040h, 050h, 0a0h, 032h, 064h, 0c8h ; pixel map width lo db 00ah, 044h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; pixel map width hi db 00ah, 054h, 00dh, 00dh, 000h, 000h, 001h, 001h, 001h ; clock sel db 00ah, 051h, 003h, 002h, 003h, 004h, 002h, 003h, 004h ; display mode 2 db 00ah, 070h, 000h, 000h, 000h, 000h, 080h, 080h, 080h ; ext clock sel db 00ah, 050h, 00fh, 00fh, 0c7h, 0c7h, 007h, 007h, 007h ; display mode 1 db 00ah, 055h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; Border Color db 00ah, 060h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; Sprite Pal Lo db 00ah, 061h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; Sprite Pal hi db 00ah, 062h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; Sprite Pre Lo db 00ah, 063h, 000h, 000h, 000h, 000h, 000h, 000h, 000h ; Sprite Pre hi db 00ah, 064h, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh ; Palette Mask db 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh ; end of the list xga_newbank proc ; XGA-specific bank-switching routine cmp xga_isinmode,2 ; are we in an XGA-specific mode? jl return ; nope. bail out. mov curbk,ax ; save the new current bank value mov dx,xga_reg_base ; Select Page add dx,08h out dx,al ; assumes bank number is in al return: ret xga_newbank endp xga_16linewrite proc near ; 16-color Line Write mov bx,ax ; calculate the # of columns sub bx,cx mov ax,xga_xdots ; this many dots / line mul dx ; times this many lines - ans in dx:ax push cx ; save the X-value for a tad shr cx,1 ; and adjust for two bits per pixel add ax,cx ; plus this many x-dots adc dx,0 ; answer in dx:ax - dl=bank, ax=offset mov di,ax ; save offset in DI pop cx ; restore the X-value mov ax,dx ; xga_newbank expects bank in al new_bank: call far ptr xga_newbank same_bank: mov ah,es:[di] ; grab the old byte value mov al,[si] ; and the new color value and al,0fh ; isolate the bits we want test cx,1 ; odd pixel address? jnz xga_sk1 ; yup and ah,0f0h ; isolate the low-order jmp short xga_sk2 xga_sk1:and ah,0fh ; isolate the high-order shl al,1 shl al,1 shl al,1 shl al,1 xga_sk2:or al,ah ; combine the two nibbles mov es:[di],al ; write the dot inc si ; increment the source addr dec bx ; more to go? jz done ; nope inc cx ; next pixel test cx,1 ; odd pixel? jnz same_bank ; yup inc di ; increment the destination cmp di,0 ; segment wrap? jnz same_bank ; nope mov ax,curbk ; update the bank cvalue inc ax jmp new_bank done: ret xga_16linewrite endp xga_super16addr proc near ; can be put in-line but shared by ; read and write routines clc ; clear carry flag push ax ; save this for a tad mov ax,xga_xdots ; this many dots / line mul dx ; times this many lines - ans in dx:ax push cx ; save the X-value for a tad shr cx,1 ; and adjust for two bits per pixel add ax,cx ; plus this many x-dots adc dx,0 ; answer in dx:ax - dl=bank, ax=offset pop cx ; restore the X-value mov bx,ax ; save this in BX cmp dx,curbk ; see if bank changed je same_bank ; jump if old bank ok mov ax,dx ; xga_newbank expects bank in al call far ptr xga_newbank same_bank: pop ax ; restore AX ret xga_super16addr endp xga_16write proc near ; XGA 256 colors write-a-dot call xga_super16addr ; calculate address and switch banks mov ah,es:[bx] ; grab the old byte value and al,0fh ; isolate the bits we want test cx,1 ; odd pixel address? jnz xga_sk1 ; yup and ah,0f0h ; isolate the low-order jmp short xga_sk2 xga_sk1:and ah,0fh ; isolate the high-order shl al,1 shl al,1 shl al,1 shl al,1 xga_sk2:or al,ah ; combine the two nibbles mov es:[bx],al ; write the dot ret ; we done. xga_16write endp xga_16read proc near ; XGA 256 colors read-a-dot call xga_super16addr ; calculate address and switch banks mov al,es:[bx] ; read the dot test cx,1 ; odd number of pixels? jz xga_sk1 ; nope shr ax,1 ; adjust for odd pixel count shr ax,1 shr ax,1 shr ax,1 xga_sk1:and ax,0fh ; isolate the byte value ret ; we done. xga_16read endp xga_clear proc uses es si di ; clear the XGA memory cmp xga_clearvideo,0 ; should we really do this? jne return ; nope. skip it. mov bx,xga_result ; find out how much memory we have and bx,08h ; in 64K pages add bx,08h mov ax,0a000h ; set up to clear 0a0000-0affff push ax pop es xloop: mov ax,bx ; initialize the bank addr call xga_newbank mov ax,0 mov cx,16384 ; clear out 32K mov di,0 rep stosw mov cx,16384 ; clear out 32K rep stosw dec bx ; another page? cmp bx,0 jge xloop return: ret xga_clear endp xga_setpalette proc uses es si di, palette:word ; set the XGA palette cmp xga_isinmode,2 ; are we in an XGA graphics mode? jl return ; nope mov dx,xga_reg_base ; wait for a retrace add dx,5 mov al,1 ; clear the start-of-blanking out dx,al bloop: in al,dx test al,01h ; blanking started? jz bloop ; nope - try again mov dx,xga_reg_base ; set up for a palette load add dx,0ah mov ax,0064h ; make invisible out dx,ax mov ax,0055h ; border color out dx,ax mov ax,0066h ; palette mode out dx,ax mov ax,0060h ; start at palette 0 out dx,ax mov ax,0061h out dx,ax mov si,palette mov cx,768 mov ax,065h ; palette update out dx,al inc dx ; palette data .186 rep outsb .8086 dec dx mov ax,0ff64h ; make visible out dx,ax return: ret xga_setpalette endp xga_detect proc uses es di si cmp xga_reg_base,-2 ; has the XGA detector already failed? jne xga_sk1 ; ne = not yet jmp xga_notfound ; e = yes, fail again xga_sk1:cmp xga_reg_base,-1 ; have we already found the XGA? je xga_loc ; e = no jmp xga_found ; yes, process it xga_loc:mov ah,35h ; DOS get interrupt vector mov al,15h ; Int 15h int 21h ; returns vector in es:bx mov ax,es ; segment part or ax,ax ; undefined vector? jnz xga_sk2 ; nz = no, OK so far jmp xga_notfound ; z = yes - not an MCA machine xga_sk2:mov dx,-1 ; start with an invalid POS address mov ax,0c400h ; look for POS base address int 15h ; (Microchannel machines only) jnc xga_sk3 ; nc = success jmp xga_notfound ; error - not an MC machine xga_sk3:mov xga_pos_base,dx ; save pos_base_address xor cx,cx ; check all MCA slots & motherboard cmp dx,-1 ; do we have a good POS? jne xga_lp1 ; ne = yes, proceed with MCA checks jmp xga_notfound ; no, fail xga_lp1:cli ; no interrupts, please cmp cx,0 ; treat the motherboard differently? jne xga_sk4 ; ne = yes mov al,0dfh ; enable the motherboard for setup mov dx,94h out dx,al jmp short xga_sk5 xga_sk4:mov ax,0c401h ; enable an MCA slot for setup mov bx,cx ; this slot int 15h xga_sk5:mov dx,xga_pos_base ; get pos record for the slot ID in ax,dx mov xga_cardid,ax add dx,2 ; compute IO Res Base in al,dx ; get POS data byte1 mov byte ptr xga_1mb,al ; save it temporarily inc dx ; switch to byte 2 in al,dx ; get POS data mov byte ptr xga_1mb+1,al ; save it temporarily inc dx ; switch to byte 3 in al,dx ; get POS data mov byte ptr xga_1mb+2,al ; save it temporarily inc dx ; switch to byte 4 in al,dx ; get POS data mov byte ptr xga_1mb+3,al ; save it temporarily cmp cx,0 ; treat the motherboard differently jne xga_sk6 ; ne = yes mov al,0ffh ; enable the motherboard for normal out 094h,al jmp short xga_sk7 xga_sk6:mov ax,0c402h ; enable the MCA slot for normal mov bx,cx ; this slot int 15h xga_sk7:sti ; interrupts on again mov ax,xga_cardid ; is an XGA adapter on this slot? cmp ax,08fd8h jae xga_sk8 ; ae = yes jmp xga_lp2 ; try another slot xga_sk8:cmp ax,08fdbh ; still within range? jbe xga_sk9 ; be = yes jmp xga_lp2 ; no, try another slot xga_sk9:mov al,byte ptr xga_1mb ; restore POS data byte 1 and ax,0eh ; muck about with it to get reg base shl ax,1 shl ax,1 shl ax,1 add ax,2100h mov xga_reg_base,ax mov dx,xga_reg_base ; is there a monitor on this slot? add dx,0ah mov al,052h out dx,al mov dx,xga_reg_base add dx,0bh in al,dx and al,0fh cmp al,00h ; illegal value, returned under Win 3.0 je xga_lp2 cmp al,0fh jne xga_isthere ; ne = yes xga_lp2:inc cx ; try another adapter? cmp cx,9 ; done all slots? ja xga_ska ; a = yes jmp xga_lp1 ; no, try another slot xga_ska:jmp xga_notfound ; forget it - no XGA here xga_isthere: and ax,06h ; strip off the low & high bit xor ax,05h ; reverse the 3rd & low bits mov xga_result,ax ; save the result flag mov dx,xga_reg_base ; is this XGA in VGA mode? in al,dx test al,1 jnz xga_skb ; nz = yes - single-monitor setup or xga_result,10h ; dual-monitor setup xga_skb: mov ah,byte ptr xga_1mb+2 ; retrieve POS data byte 3 and ax,0fe00h ; eliminate the low-order bits mov bl,byte ptr xga_1mb ; retrieve POS data byte 1 and bx,0eh ; strip it down to the IODA mov cx,5 ; shift it up 5 bits shl bx,cl or ax,bx ; compute the 4MB aperture value mov word ptr xga_4mb+2,ax ; save the result mov al, byte ptr xga_1mb+3 ; retrieve POS data byte 4 and ax,0fh ; select the 1MB aperture bits mov cx,4 ; shift it up 4 bits shl ax,cl mov word ptr xga_1mb+2,ax ; save the result mov ax,0 mov word ptr xga_1mb,ax mov dx,xga_reg_base ; Interrupt Disable add dx,4 xor al,al out dx,al mov dx,xga_reg_base ; Switch to Extended Mode ;; add dx,00h mov al,4 out dx,al mov dx,xga_reg_base ; Aperture Control add dx,01h mov al,1 out dx,al mov dx,xga_reg_base ; disable Palette Mask add dx,0ah mov ax,0064h out dx,ax mov xga_isinmode,2 ; pretend we're already in graphics mov al,12 ; select page 12 call xga_newbank push es ; see if this page has any memory mov ax,0a000h push ax pop es mov ah,000a5h mov es:0,al mov es:1,ah cmp es:0,al jne xga_512 add xga_result,8 ; 1MB RAM found xga_512:pop es mov al,0 ; select page 0 call xga_newbank mov xga_isinmode,0 ; replace the "in-graphics" flag mov dx,xga_reg_base ; Palette Mask add dx,0ah mov ax,0ff64h out dx,ax test xga_result,10h ; dual monitor setup? jnz xga_found ; yup - don't restore as a VGA mov dx,xga_reg_base ; Switch to VGA Mode ;; add dx,00h mov al,1 out dx,al mov dx,03c3h ; Enable VGA Address Code mov al,1 out dx,al jmp short xga_found xga_notfound: mov xga_reg_base,-2 ; set failure flag xga_found: mov ax,xga_result ; return the result ret xga_detect endp xga_mode proc uses es di si, mode:word mov curbk,-1 ; preload impossible bank number call xga_detect ; is an XGA adapter present? cmp ax,0 jne whichmode jmp nope ; nope whichmode: mov bx,mode cmp bx,xga_twidth ; mode number out of range? jb whichmode0 jmp nope ; yup - fail right now. whichmode0: cmp mode,0 ; 80-col VGA text mode? jne whichmode1 jmp mode_0 ; yup whichmode1: cmp mode,1 ; 132-col VGA text mode? jne whichmode2 jmp nope ; Fractint doesn't use this routine whichmode2: mov bx,mode ; locate the table entries add bx,mode mov dx,xga_requir[bx] ; does our setup support this mode? and al,dl cmp al,dl je whichmode3 jmp nope ; nope whichmode3: mov ax,13h ; switch to 320x200x256 mode call maybeor ; maybe or AL or (for Video-7s) BL int 10h push ds ; reset ES==DS pop es mov ax,1017h ; get the DAC values mov bx,0 mov cx,256 mov dx,offset paldata ; a safe place when switching XGA modes int 10h cmp xga_loaddac,0 ; save the palette? je paskip ; (yes, if we want to fake 'loaddac') mov si, offset paldata mov di, offset dacbox mov cx,768/2 rep movsw mov xga_loaddac,0 ; reset the toggle for next time paskip: mov bx,769 ; adjust the palette paloop: dec bx mov ah,paldata[bx] shl ah,1 shl ah,1 mov paldata[bx],ah cmp bx,0 jne paloop mov dx,xga_reg_base ; Palette Mask add dx,0ah mov ax,00064h ; (Disable the XGA palette) out dx,ax mov dx,xga_swidth[bx] ; collect and save the scan-line length mov xga_xdots,dx mov dx,xga_colors[bx] ; how many colors do we have? mov xga_iscolors,dx ; save this mode_3: mov dx,03c3h ; Enable VGA Address Code mov al,1 out dx,al mov si,offset xga_val ; point to start of values table mov bx,mode ; use mode as an offset model1: mov dx,xga_reg_base ; get the base pointer mov ah,0 ; get the increment mov al,cs:0[si] cmp al,0ffh ; end of the table? je model2 ; yup add dx,ax cmp al,0ah ; check for access type je modsk2 mov al,cs:0[si+bx] ; get the value and OUT it out dx,al jmp short modsk3 modsk2: mov al,cs:1[si] ; get the value and OUT it mov ah,cs:0[si+bx] out dx,ax modsk3: add si,xga_twidth ; try another table entry jmp short model1 model2: mov xga_isinmode,2 ; pretend we're already in graphics call xga_clear ; clear out the memory mov curbk,-1 ; reset the bank counter mov dx,xga_reg_base ; set up for final loads add dx,0ah mov bx,mode ; how many colors do we have? add bx,mode cmp xga_colors[bx],0 ; "true color" mode? jne modsk4 ; nope - skip the funny palette load mov ax,0064h ; make invisible out dx,ax mov ax,8055h ; border color out dx,ax mov ax,0066h ; palette mode out dx,ax mov ax,0060h ; start at palette 0 out dx,ax mov ax,0061h ; "" out dx,ax mov cx,0 ; ready to update the palette mov al,065h ; palette update out dx,al inc dx ; palette data model3: mov al,0 ; zero out the... out dx,al ; red value out dx,al ; and the green value mov al,cl ; klooge up the blue value and al,1fh ; convert to 1,2,...1f shl al,1 ; convert to 2,4,...3e shl al,1 ; convert to 4,8,...7c shl al,1 ; convert to 8,16,..fd out dx,al ; blue value inc cx ; another palette value to go? cmp cx,128 jb model3 dec dx ; back to normal mov ax,0ff64h ; make the palette visible out dx,ax jmp ok modsk4: mov bx, offset paldata ; reset the palette push bx mov xga_isinmode,2 call xga_setpalette pop bx jmp ok mode_0: ; Set 80 column mode mov dx,xga_reg_base ; Aperture Control add dx,01h xor al,al ; (disable the XGA 64K aperture) out dx,al mov dx,xga_reg_base ; Interrupt Disable add dx,4 xor al,al out dx,al mov dx,xga_reg_base ; Clear Interrupts add dx,5 mov al,0ffh out dx,al test xga_result,10h ; dual monitor setup? jz mode_0a jmp nope ; yup - don't restore as a VGA mode_0a: mov dx,xga_reg_base ; Palette Mask add dx,0ah mov ax,0ff64h ; (Enable the XGA palette) out dx,ax mov dx,xga_reg_base ; Enable VFB, Prepare for Reset add dx,0ah mov ax,1550h out dx,ax mov dx,xga_reg_base ; Enable VFB, reset CRTC add dx,0ah mov ax,1450h out dx,ax mov dx,xga_reg_base ; Normal Scale Factors add dx,0ah mov ax,0051h out dx,ax mov dx,xga_reg_base ; Select VGA Oscillator add dx,0ah mov ax,0454h out dx,ax mov dx,xga_reg_base ; Ext Oscillator (VGA) add dx,0ah mov ax,7f70h out dx,ax mov dx,xga_reg_base ; Ensure no Vsynch Interrupts add dx,0ah mov ax,202ah out dx,ax mov dx,xga_reg_base ; Switch to VGA Mode ;; add dx,00h mov al,1 out dx,al mov dx,03c3h ; Enable VGA Address Code mov al,1 out dx,al mov ax,1202h ; select 400 scan lines mov bl,30h int 10h mov ax,0+3 ; set video mode 3 or al,xga_clearvideo ; (might supress video-clearing) cmp xga_clearvideo,0 ; clear the video option set? je mode_0b mov ax,08eh ; ugly klooge: VGA graphics, no clear mode_0b: int 10h jmp ok ; we're done nope: mov xga_isinmode,0 mov ax,0 ; return failure ret ok: mov ax,mode ; remember the mode we're in mov xga_isinmode,ax mov ax,1 ; return OK ret xga_mode endp ; **************** internal Read/Write-a-dot routines *********************** ; ; These Routines all assume the following register values: ; ; AL = The Color (returned on reads, sent on writes) ; CX = The X-Location of the Pixel ; DX = The Y-Location of the Pixel nullwrite proc near ; "do-nothing" write ret nullwrite endp nullread proc near ; "do-nothing" read mov ax,0 ; "return" black pixels ret nullread endp normalwrite proc near ; generic write-a-dot routine mov ah,12 ; write the dot (al == color) mov bx,0 ; this page push bp ; some BIOS's don't save this int 10h ; do it. pop bp ; restore the saved register ret ; we done. normalwrite endp normalread proc near ; generic read-a-dot routine mov ah,13 ; read the dot (al == color) mov bx,0 ; this page push bp ; some BIOS's don't save this int 10h ; do it. pop bp ; restore the saved register ret ; we done. normalread endp mcgawrite proc near ; MCGA 320*200, 246 colors xchg dh,dl ; bx := 256*y mov bx,cx ; bx := x add bx,dx ; bx := 256*y + x shr dx,1 shr dx,1 ; dx := 64*y add bx,dx ; bx := 320*y + x mov es:[bx],al ; write the dot ret ; we done. mcgawrite endp mcgaread proc near ; MCGA 320*200, 246 colors xchg dh,dl ; dx := 256*y mov bx,cx ; bx := x add bx,dx ; bx := 256*y + x shr dx,1 shr dx,1 ; dx := 64*y add bx,dx ; bx := 320*y + x mov al,es:[bx] ; retrieve the previous value ret ; we done. mcgaread endp ; These routines are for bit-plane 16 color modes, including bank ; switched superVGA varieties such as the Tseng 1024x768x16 mode. ; Tim Wegner ; vgawrite proc near ; bank-switched EGA/VGA write mode 0 mov bh,al ; save the color value for a bit mov ax,vxdots ; this many dots / line mul dx ; times this many lines add ax,cx ; plus this many x-dots adc dx,0 ; DX:AX now holds the pixel count mov cx,ax ; save this for the bit mask and cx,7 ; bit-mask shift calculation xor cl,7 ; ... mov si,ax ; set up for the address shift shr dx,1 ; (ugly) 32-bit shift-by-3 logic rcr si,1 ; ((works on ANY 80x6 processor)) shr dx,1 ; ... rcr si,1 ; ... shr dx,1 ; ... rcr si,1 ; ... cmp dx,curbk ; see if bank changed je vgasame_bank ; jump if old bank ok mov ax,dx ; newbank expects bank in al call far ptr newbank ; switch banks vgasame_bank: mov dx,03ceh ; graphics controller address mov ax,0108h ; set up controller bit mask register shl ah,cl ; ... out dx,ax ; ... mov ah,bh ; set set/reset registers mov al,0 ; ... out dx,ax ; ... mov ax,0f01h ; enable set/reset registers out dx,ax ; ... or es:[si],al ; update all bit planes ret ; we done. vgawrite endp vgaread proc near ; bank-switched EGA/VGA read mode 0 mov ax,vxdots ; this many dots / line mul dx ; times this many lines add ax,cx ; plus this many x-dots adc dx,0 ; DX:AX now holds the pixel count mov cx,ax ; save this for the bit mask and cx,7 ; bit-mask shift calculation xor cl,7 ; ... mov si,ax ; set up for the address shift shr dx,1 ; (ugly) 32-bit shift-by-3 logic rcr si,1 ; ((works on ANY 80x6 processor)) shr dx,1 ; ... rcr si,1 ; ... shr dx,1 ; ... rcr si,1 ; ... cmp dx,curbk ; see if bank changed je vgasame_bank ; jump if old bank ok mov ax,dx ; newbank expects bank in al call far ptr newbank ; switch banks vgasame_bank: mov ch,01h ; bit mask to shift shl ch,cl ; ... mov bx,0 ; initialize bits-read value (none) mov dx,03ceh ; graphics controller address mov ax,0304h ; set up controller address register vgareadloop: out dx,ax ; do it mov bh,es:[si] ; retrieve the old value and bh,ch ; mask one bit neg bh ; set bit 7 correctly rol bx,1 ; rotate the bit into bl dec ah ; go for another bit? jge vgareadloop ; sure, why not. mov al,bl ; returned pixel value ret ; we done. vgaread endp outax8bit proc near ; convert OUT DX,AX to push ax ; several OUT DX,ALs out dx,al ; (leaving registers intact) inc dx mov al,ah out dx,al dec dx pop ax ret outax8bit endp ; -------------------------------------------------------------------------- ; new Tandy and CGA code from Joseph Albrecht align 2 ;Scan line address table for 16K video memory scan16k dw 0000h,2000h,0050h,2050h,00A0h,20A0h,00F0h,20F0h dw 0140h,2140h,0190h,2190h,01E0h,21E0h,0230h,2230h dw 0280h,2280h,02D0h,22D0h,0320h,2320h,0370h,2370h dw 03C0h,23C0h,0410h,2410h,0460h,2460h,04B0h,24B0h dw 0500h,2500h,0550h,2550h,05A0h,25A0h,05F0h,25F0h dw 0640h,2640h,0690h,2690h,06E0h,26E0h,0730h,2730h dw 0780h,2780h,07D0h,27D0h,0820h,2820h,0870h,2870h dw 08C0h,28C0h,0910h,2910h,0960h,2960h,09B0h,29B0h dw 0A00h,2A00h,0A50h,2A50h,0AA0h,2AA0h,0AF0h,2AF0h dw 0B40h,2B40h,0B90h,2B90h,0BE0h,2BE0h,0C30h,2C30h dw 0C80h,2C80h,0CD0h,2CD0h,0D20h,2D20h,0D70h,2D70h dw 0DC0h,2DC0h,0E10h,2E10h,0E60h,2E60h,0EB0h,2EB0h dw 0F00h,2F00h,0F50h,2F50h,0FA0h,2FA0h,0FF0h,2FF0h dw 1040h,3040h,1090h,3090h,10E0h,30E0h,1130h,3130h dw 1180h,3180h,11D0h,31D0h,1220h,3220h,1270h,3270h dw 12C0h,32C0h,1310h,3310h,1360h,3360h,13B0h,33B0h dw 1400h,3400h,1450h,3450h,14A0h,34A0h,14F0h,34F0h dw 1540h,3540h,1590h,3590h,15E0h,35E0h,1630h,3630h dw 1680h,3680h,16D0h,36D0h,1720h,3720h,1770h,3770h dw 17C0h,37C0h,1810h,3810h,1860h,3860h,18B0h,38B0h dw 1900h,3900h,1950h,3950h,19A0h,39A0h,19F0h,39F0h dw 1A40h,3A40h,1A90h,3A90h,1AE0h,3AE0h,1B30h,3B30h dw 1B80h,3B80h,1BD0h,3BD0h,1C20h,3C20h,1C70h,3C70h dw 1CC0h,3CC0h,1D10h,3D10h,1D60h,3D60h,1DB0h,3DB0h dw 1E00h,3E00h,1E50h,3E50h,1EA0h,3EA0h,1EF0h,3EF0h ;Scan line address table for 32K video memory scan32k dw 0000h,2000h,4000h,6000h,00a0h,20a0h,40a0h,60a0h dw 0140h,2140h,4140h,6140h,01e0h,21e0h,41e0h,61e0h dw 0280h,2280h,4280h,6280h,0320h,2320h,4320h,6320h dw 03c0h,23c0h,43c0h,63c0h,0460h,2460h,4460h,6460h dw 0500h,2500h,4500h,6500h,05a0h,25a0h,45a0h,65a0h dw 0640h,2640h,4640h,6640h,06e0h,26e0h,46e0h,66e0h dw 0780h,2780h,4780h,6780h,0820h,2820h,4820h,6820h dw 08c0h,28c0h,48c0h,68c0h,0960h,2960h,4960h,6960h dw 0a00h,2a00h,4a00h,6a00h,0aa0h,2aa0h,4aa0h,6aa0h dw 0b40h,2b40h,4b40h,6b40h,0be0h,2be0h,4be0h,6be0h dw 0c80h,2c80h,4c80h,6c80h,0d20h,2d20h,4d20h,6d20h dw 0dc0h,2dc0h,4dc0h,6dc0h,0e60h,2e60h,4e60h,6e60h dw 0f00h,2f00h,4f00h,6f00h,0fa0h,2fa0h,4fa0h,6fa0h dw 1040h,3040h,5040h,7040h,10e0h,30e0h,50e0h,70e0h dw 1180h,3180h,5180h,7180h,1220h,3220h,5220h,7220h dw 12c0h,32c0h,52c0h,72c0h,1360h,3360h,5360h,7360h dw 1400h,3400h,5400h,7400h,14a0h,34a0h,54a0h,74a0h dw 1540h,3540h,5540h,7540h,15e0h,35e0h,55e0h,75e0h dw 1680h,3680h,5680h,7680h,1720h,3720h,5720h,7720h dw 17c0h,37c0h,57c0h,77c0h,1860h,3860h,5860h,7860h dw 1900h,3900h,5900h,7900h,19a0h,39a0h,59a0h,79a0h dw 1a40h,3a40h,5a40h,7a40h,1ae0h,3ae0h,5ae0h,7ae0h dw 1b80h,3b80h,5b80h,7b80h,1c20h,3c20h,5c20h,7c20h dw 1cc0h,3cc0h,5cc0h,7cc0h,1d60h,3d60h,5d60h,7d60h dw 1e00h,3e00h,5e00h,7e00h,1ea0h,3ea0h,5ea0h,7ea0h ;Scan line address table for 64K video memory scan64k dw 00000h,00140h,00280h,003c0h,00500h,00640h,00780h,008c0h dw 00a00h,00b40h,00c80h,00dc0h,00f00h,01040h,01180h,012c0h dw 01400h,01540h,01680h,017c0h,01900h,01a40h,01b80h,01cc0h dw 01e00h,01f40h,02080h,021c0h,02300h,02440h,02580h,026c0h dw 02800h,02940h,02a80h,02bc0h,02d00h,02e40h,02f80h,030c0h dw 03200h,03340h,03480h,035c0h,03700h,03840h,03980h,03ac0h dw 03c00h,03d40h,03e80h,03fc0h,04100h,04240h,04380h,044c0h dw 04600h,04740h,04880h,049c0h,04b00h,04c40h,04d80h,04ec0h dw 05000h,05140h,05280h,053c0h,05500h,05640h,05780h,058c0h dw 05a00h,05b40h,05c80h,05dc0h,05f00h,06040h,06180h,062c0h dw 06400h,06540h,06680h,067c0h,06900h,06a40h,06b80h,06cc0h dw 06e00h,06f40h,07080h,071c0h,07300h,07440h,07580h,076c0h dw 07800h,07940h,07a80h,07bc0h,07d00h,07e40h,07f80h,080c0h dw 08200h,08340h,08480h,085c0h,08700h,08840h,08980h,08ac0h dw 08c00h,08d40h,08e80h,08fc0h,09100h,09240h,09380h,094c0h dw 09600h,09740h,09880h,099c0h,09b00h,09c40h,09d80h,09ec0h dw 0a000h,0a140h,0a280h,0a3c0h,0a500h,0a640h,0a780h,0a8c0h dw 0aa00h,0ab40h,0ac80h,0adc0h,0af00h,0b040h,0b180h,0b2c0h dw 0b400h,0b540h,0b680h,0b7c0h,0b900h,0ba40h,0bb80h,0bcc0h dw 0be00h,0bf40h,0c080h,0c1c0h,0c300h,0c440h,0c580h,0c6c0h dw 0c800h,0c940h,0ca80h,0cbc0h,0cd00h,0ce40h,0cf80h,0d0c0h dw 0d200h,0d340h,0d480h,0d5c0h,0d700h,0d840h,0d980h,0dac0h dw 0dc00h,0dd40h,0de80h,0dfc0h,0e100h,0e240h,0e380h,0e4c0h dw 0e600h,0e740h,0e880h,0e9c0h,0eb00h,0ec40h,0ed80h,0eec0h dw 0f000h,0f140h,0f280h,0f3c0h,0f500h,0f640h,0f780h,0f8c0h ; ; ***** CGA Video Routines ***** ; ;plot a point on 320x200x4 color graphics screen plotcga4 proc near mov bx,0b800h ;point es at video buffer mov es,bx ; .. mov bx,dx ;get scan line address shl bx,1 ; .. mov bx,cs:scan16k[bx] ; .. mov ah,cl ;save low byte of column shr cx,1 ;get column offset shr cx,1 ; .. add bx,cx ;add column offset to address not ah ;get shift count and ah,3 ; .. shl ah,1 ; .. mov cl,ah ; .. and al,3 ;mask off unwanted bits rol al,cl ;get or mask mov ah,0fch ;get and mask rol ah,cl ; .. mov cl,es:[bx] ;plot the point and cl,ah ; .. or cl,al ; .. mov es:[bx],cl ; .. ret plotcga4 endp ;return a point from 320x200x4 color graphics screen getcga4 proc near mov bx,0b800h ;point es at video buffer mov es,bx ; .. mov bx,dx ;get scan line address shl bx,1 ; .. mov bx,cs:scan16k[bx] ; .. mov ax,cx ;save column shr ax,1 ;get column offset shr ax,1 ; .. add bx,ax ;add column offset to address not cl ;get shift count and cl,3 ; .. shl cl,1 ; .. mov al,es:[bx] ;return the point ror al,cl ; .. and ax,3 ; .. ret getcga4 endp ;plot a point on 640x200x2 color graphics screen plotcga2 proc near mov bx,0b800h ;point es at video buffer mov es,bx ; .. mov bx,dx ;get scan line address shl bx,1 ; .. mov bx,cs:scan16k[bx] ; .. mov ah,cl ;save low order byte of column shr cx,1 ;get column offset shr cx,1 ; .. shr cx,1 ; .. add bx,cx ;add column offset to address not ah ;get shift count and ah,7 ; .. mov cl,ah ; .. and al,1 ;mask off unwanted bits rol al,cl ;get or mask mov ah,0feh ;get and mask rol ah,cl ; .. mov cl,es:[bx] ;plot the point and cl,ah ; .. or cl,al ; .. mov es:[bx],cl ; .. ret plotcga2 endp ;return a point from 640x200x2 color graphics screen getcga2 proc near mov bx,0b800h ;point es at video buffer mov es,bx ; .. mov bx,dx ;get scan line address shl bx,1 ; .. mov bx,cs:scan16k[bx] ; .. mov ax,cx ;save column shr ax,1 ;get column offset shr ax,1 ; .. shr ax,1 ; .. add bx,ax ;add column offset to address not cl ;get shift count and cl,7 ; .. mov al,es:[bx] ;return the point ror al,cl ; .. and ax,1 ; .. ret getcga2 endp ; ; ***** Tandy 1000 Video Routines ***** ; ;plot a point on tandy 1000 640x200x4 color graphics screen plottandy4 proc near mov bx,0b800h ;point es at video segment mov es,bx ; .. mov bx,dx ;get scan line address shl bx,1 ; .. mov bx,cs:scan32k[bx] ; .. mov dx,cx ;save column shr dx,1 ;get column offset shr dx,1 ; .. and dl,0feh ; .. add bx,dx ;add column offset to address not cl ;get shift count and cl,7 ; .. mov ah,al ;get or mask shr ah,1 ; .. and ax,101h ; .. rol ax,cl ; .. mov dx,0fefeh ;get and mask rol dx,cl ; .. mov cx,es:[bx] ;plot the point and cx,dx ; .. or cx,ax ; .. mov es:[bx],cx ; .. ret plottandy4 endp ;return a point from tandy 1000 640x200x4 color graphics screen gettandy4 proc near mov bx,0b800h ;point es at video segment mov es,bx ; .. mov bx,dx ;get scan line address shl bx,1 ; .. mov bx,cs:scan32k[bx] ; .. mov ax,cx ;save column shr ax,1 ;get column offset shr ax,1 ; .. and al,0feh ; .. add bx,ax ;add column offset to address not cl ;get shift count and cl,7 ; .. mov ax,es:[bx] ;return the point ror ax,cl ; .. and ax,101h ; .. rol ah,1 ; .. or al,ah ; .. and ax,3 ; .. ret gettandy4 endp ;plot a point on tandy 1000 16 color graphics screen plottandy16 proc near mov es,tandyseg ;point es at video buffer mov bx,dx ;get scan line address shl bx,1 ; .. add bx,tandyscan ; .. mov bx,cs:[bx] ; .. mov ah,0f0h ;set mask for odd pixel mov dx,cx ;save x shr dx,1 ;get column offset jc plottandy16a ;check for odd/even pixel not ah ;set mask for even pixel mov cl,4 ;move color to proper pobxtion shl al,cl ; .. plottandy16a: add bx,dx ;add column offset to address mov dl,es:[bx] ;plot the point and dl,ah ; .. or dl,al ; .. mov es:[bx],dl ; .. ret plottandy16 endp ;return a point from tandy 1000 16 color graphics mode gettandy16 proc near mov es,tandyseg ;point es at video buffer mov bx,dx ;get scan line address shl bx,1 ; .. add bx,tandyscan ; .. mov bx,cs:[bx] ; .. mov dx,cx ;save x shr cx,1 ;add column offset to address add bx,cx ; .. mov al,es:[bx] ;get pixel test dl,1 ;check for odd/even pixel jnz gettandy16a ; .. mov cl,4 ;move color to proper position shr al,cl ; .. gettandy16a: and ax,0fh ;mask off unwanted bits ret gettandy16 endp ;setup tandy 1000 640x200x16 color mode tandysetup proc near mov dx,03d4h ; write to this address mov ax,07100h ; write to this register and value call tandyport ; do it. mov ax,05001h ; write to this register and value call tandyport ; do it. mov ax,05a02h ; write to this register and value call tandyport ; do it. mov ax,00e03h ; write to this register and value call tandyport ; do it. mov ax,0ff04h ; write to this register and value call tandyport ; do it. mov ax,00605h ; write to this register and value call tandyport ; do it. mov ax,0c806h ; write to this register and value call tandyport ; do it. mov ax,0e207h ; write to this register and value call tandyport ; do it. mov ax,00009h ; write to this register and value call tandyport ; do it. mov ax,0000ch ; write to this register and value call tandyport ; do it. mov ax,01810h ; write to this register and value call tandyport ; do it. mov ax,04612h ; write to this register and value call tandyport ; do it. mov dx,03d8h ; new port mov al,01bh ; and value out dx,al ; do it. mov dx,03d9h ; new port mov al,000h ; and value out dx,al ; do it. mov dx,03ddh ; new port mov al,000h ; and value out dx,al ; do it. mov dx,03dfh ; new port mov al,024h ; and value out dx,al ; do it. mov dx,03dah ; new port mov al,001h ; and value out dx,al ; do it. mov dx,03deh ; new port mov al,00fh ; and value out dx,al ; do it. mov dx,03dah ; new port mov al,002h ; and value out dx,al ; do it. mov dx,03deh ; new port mov al,000h ; and value out dx,al ; do it. mov dx,03dah ; new port mov al,003h ; and value out dx,al ; do it. mov dx,03deh ; new port mov al,010h ; and value out dx,al ; do it. mov dx,03dah ; new port mov al,005h ; and value out dx,al ; do it. mov dx,03deh ; new port mov al,001h ; and value out dx,al ; do it. mov dx,03dah ; new port mov al,008h ; and value out dx,al ; do it. mov dx,03deh ; new port mov al,002h ; and value out dx,al ; do it. ;set color palette registers to default state mov cx,16 ;reset colors 0-15 to default state xor bh,bh ;set initial color xor bl,bl ;set initial paletter register mov di,2 ;reset border color call settandypal ; .. tandysetup1: mov di,16 ;port offset for palette registers call settandypal ;set palette register inc bl ;bump up to next palette register inc bh ;bump up to next color loop tandysetup1 ;do remaining palette registers cmp orvideo,0 ; are we supposed to clear RAM? jne tandysetup2 ; (nope) push es ; save ES for a tad mov ax,0a000h ; clear the memory mov es,ax ; ... cld ; string ops forward mov cx,07d00h ; this many words mov di,0 ; starting here mov ax,0 ; clear out to zero rep stosw ; do it. pop es ; restore ES tandysetup2: mov oktoprint,0 ; no printing in this mode ret tandysetup endp ;write data to 6845 registers tandyport proc near out dx,al ;write 6845 reg number to port 3d4 mov al,ah ;write 6845 reg data to port 3d5 inc dx ; .. out dx,al ; .. dec dx ;point back to port 3d4 ret tandyport endp ;subroutine to set a Tandy 1000 palette register settandypal proc near mov dx,3dah ;address & status register cli ;disable interrupts settandypal2: in al,dx ;get status register and al,8 ;look for bit 3 jz settandypal2 ;wait for vertical retrace mov al,bl ;get palette number cbw ; .. add ax,di ;add offset for palette register out dx,al ;set palette mov al,bh ;get color to store mov dx,3deh ;palette data register out dx,al ;set palette color mov dx,3dah ;address & status register xor ax,ax ;al = 0 to reset address register out dx,al ;reset it sti ;re-enable interrupts ret settandypal endp ; ----------------------------------------------------------------------------- ; The 360x480 mode draws heavily on Michael Abrash's article in ; the January/February 1989 "Programmer's Journal" and files uploaded ; to Compuserv's PICS forum by Dr. Lawrence Gozum - integrated here ; by Timothy Wegner ; Michael Abrash equates. Not all used, but I'll leave for reference. VGA_SEGMENT EQU 0A000h SC_INDEX EQU 3C4h ;Sequence Controller Index register GC_INDEX EQU 3CEh ;Graphics Controller Index register CRTC_INDEX EQU 3D4h ;CRT Controller Index register MAP_MASK EQU 2 ;Map Mask register index in SC MEMORY_MODE EQU 4 ;Memory Mode register in SC MAX_SCAN_LINE EQU 9 ;Maximum Scan Line reg index in CRTC ;Use 9 for 2 pages of 320x400 ;MAX_SCAN_LINE EQU 1 ;Use 1 for 4 pages of 320x200 START_ADD_HIGH EQU 0Ch ;Start Address High reg index in CRTC UNDERLINE EQU 14h ;Underline Location reg index in CRTC MODE_CONTROL EQU 17h ;Mode Control reg index in CRTC READ_MAP EQU 4 ;Read Mask register index in SC GRAPHICS_MODE EQU 5 ;Graphics Mode register index in SC MISC EQU 6 ;Miscellaneous register index in SC WORD_OUTS_OK EQU 1 ;set to 0 to assemble for computers ;that can't handle word outs to indexed ;VGA registers ; ;Macro to output a word value to a port ; OUT_WORD MACRO IF WORD_OUTS_OK OUT DX,AX ELSE OUT DX,AL INC DX XCHG AH,AL OUT DX,AL DEC DX XCHG AH,AL ENDIF ENDM ;Macro to ouput a constant value to an indexed VGA register CONSTANT_TO_INDEXED_REGISTER MACRO ADDRESS,INDEX,VALUE MOV DX,ADDRESS MOV AX,(VALUE SHL 8)+INDEX OUT_WORD ENDM tweak256read proc near uses si ; Tweaked-VGA ...x256 color mode mov ax,vxdots ;; shr ax,1 ;; shr ax,1 ; now ax = vxdots/4 mul dx ;Point to start of desired row push cx ;Save X coordinate for later shr cx,1 ;There are 4 pixels at each address shr cx,1 ;so divide X by 4 add ax,cx ;Point to pixels address mov si,ax pop ax ;Retrieve X coordinate and al,3 ;Get the plane number of the pixel mov ah,al mov al,READ_MAP mov dx,GC_INDEX OUT_WORD ;Set to write to the proper plane for the ;pixel xor ax,ax lods byte ptr es:[si] ;Read the pixel ret tweak256read endp tweak256write proc near uses di ; Tweaked-VGA ...x256 color mode mov bl,al ; color mov ax,vxdots ;; shr ax, 1 ;; shr ax, 1 ; now ax = vxdots/4 mul dx ;Point to start of desired row push cx ;Save X coordinate for later shr cx,1 ;There are 4 pixels at each address shr cx,1 ;so divide X by 4 add ax,cx ;Point to pixels address mov di,ax pop cx ;Retrieve X coordinate and cl,3 ;Get the plane number of the pixel mov ah,1 shl ah,cl ;Set the bit corresponding to the plane ;the pixel is in mov al,MAP_MASK mov dx,SC_INDEX OUT_WORD ;Set to write to the proper plane for the ;pixel mov es:[di],bl ;Draw the pixel ret tweak256write endp ; The following ATI 1024x768x16 mode is courtesy of Mark Peterson ati1024read proc near ; ATI 1024x768x16 read call ati1024addr ; calculate the address mov al,es:[bx] ; get the byte the pixel is in cmp xga_isinmode,0 ; say, is this really XGA-style I/O? je notxga ; nope test cl,1 ; is X odd? jnz atireadhigh ; Yup. Use the high bits jmp short atireadlow ; else use the low bits notxga: test cl,1 ; is X odd? jz atireadhigh ; Nope. Use the high bits atireadlow: and ax,0fh ; zero out the high-order bits ret atireadhigh: and ax,0f0h ; zero out the low-order bits mov cl,4 ; shift the results shr al,cl ; ... ret ati1024read endp ati1024write proc near ; ATI 1024x768x16 write call ati1024addr ; calculate the address mov dl,es:[bx] ; get the byte the pixel is in and al,00fh ; zero out the high-order color bits cmp xga_isinmode,0 ; say, is this really XGA-style I/O? je notxga ; nope test cl,1 ; is X odd? jnz atiwritehigh ; Yup. Use the high bits jmp short atiwritelow ; else use the low bits notxga: test cl,1 ; is X odd? jz atiwritehigh ; Nope. Use the high bits atiwritelow: and dl,0f0h ; zero out the low-order video bits or dl,al ; add the two together mov es:[bx],dl ; and write the results ret atiwritehigh: mov cl,4 ; shift the color bits shl al,cl ; ... and dl,0fh ; zero out the high-order video bits or dl,al ; add the two together mov es:[bx],dl ; and write the results ret ati1024write endp ati1024addr proc near ; modification of TIW's Super256addr clc ; clear carry flag push ax ; save this for a tad mov ax,vxdots ; this many dots / line mul dx ; times this many lines - ans in dx:ax add ax,cx ; plus this many x-dots adc dx,0 ; answer in dx:ax shr dx,1 ; shift the answer right one bit rcr ax,1 ; .. in the 32-bit DX:AX combo mov bx,ax ; save this in BX cmp dx,curbk ; see if bank changed je atisame_bank ; jump if old bank ok mov ax,dx ; newbank expects bank in al call far ptr newbank atisame_bank: pop ax ; restore AX ret ati1024addr endp ; ; The following 'Super256' code is courtesy of Timothy Wegner. ; super256write proc near ; super-VGA ...x256 colors write-a-dot call super256addr ; calculate address and switch banks mov es:[bx],al ; write the dot ret ; we done. super256write endp super256read proc near ; super-VGA ...x256 colors read-a-dot call super256addr ; calculate address and switch banks mov al,es:[bx] ; read the dot ret ; we done. super256read endp super256addr proc near ; can be put in-line but shared by ; read and write routines clc ; clear carry flag push ax ; save this for a tad mov ax,vxdots ; this many dots / line mul dx ; times this many lines - ans in dx:ax add ax,cx ; plus this many x-dots adc dx,0 ; answer in dx:ax - dl=bank, ax=offset mov bx,ax ; save this in BX cmp dx,curbk ; see if bank changed je same_bank ; jump if old bank ok mov ax,dx ; newbank expects bank in al call far ptr newbank same_bank: pop ax ; restore AX ret super256addr endp ; ; BANKS.ASM was used verbatim except: ; 1) removed ".model small" ; 2) deleted "end" ; Integrated by Tim Wegner 8/15/89 ; (switched to John's 9/7/89 version on 9/10/89 - Bert) ; (switched to John's 1/5/90 version on 1/9/90 - Bert) ; (switched to John's version 3 on 4/27/90 - Bert) ; (added logic for various resolution on 9/10/90 - Bert) ; (upgraded to John's version 3.5 on 5/14/91 - Bert) ; ; .MODEL medium,c ; ; Copyright 1988,89,90,91 John Bridges ; Free for use in commercial, shareware or freeware applications ; ; SVGAMODE.ASM ; .data OSEG equ SS: ;segment override for variable access bankadr dw offset $nobank if @CodeSize bankseg dw seg $nobank endif vesa_bankswitch dd $vesa_nullbank ; initially, do-nothing vesa_mapper dd $nobank vesa_detect dw 1 ; set to 0 to disable VESA-detection vesa_gran_offset dw 0 vesa_low_window dw 0 vesa_high_window dw 1 vesa_granularity db 0 ; BDT VESA Granularity value public curbk align 2 curbk dw 0 public vga512, vga1024 vga512 dw 0 vga1024 dw 0 public cirrus,everex,paradise,tseng,trident,t8900 public ativga,aheada,aheadb,oaktech,video7 public chipstech,tseng4,genoa,ncr,compaq,vesa public vesa ; Bert vesa dw 0 ; Bert cirrus dw 0 video7 dw 0 tseng dw 0 tseng4 dw 0 paradise dw 0 chipstech dw 0 trident dw 0 ativga dw 0 everex dw 0 aheada dw 0 aheadb dw 0 oaktech dw 0 t8900 dw 0 genoa dw 0 ncr dw 0 compaq dw 0 xga dw 0 done_detect dw 0 ;flag to call adapter_detect & whichvga once ; this part is new - Bert .code vesa_entries dw 0 dw 640, 400,256, 4f02h,100h dw 640, 480,256, 4f02h,101h dw 800, 600, 16, 4f02h,102h dw 800, 600,256, 4f02h,103h dw 1024, 768, 16, 4f02h,104h dw 1024, 768,256, 4f02h,105h dw 1280,1024, 16, 4f02h,106h dw 1280,1024,256, 4f02h,107h ahead_entries dw 0 dw 800, 600, 16, 06ah,0 dw 800, 600, 16, 071h,0 dw 1024, 768, 16, 074h,0 dw 640, 400,256, 060h,0 dw 640, 480,256, 061h,0 dw 800, 600,256, 062h,0 dw 1024, 768,256, 063h,0 ati_entries dw 0 dw 800, 600, 16, 054h,0 dw 1024, 768, 16, 065h,0ffh ; (non-standard mode flag) dw 640, 400,256, 061h,0 dw 640, 480,256, 062h,0 dw 800, 600,256, 063h,0 dw 1024, 768,256, 064h,0 chips_entries dw 0 dw 800, 600, 16, 070h,0 dw 1024, 768, 16, 072h,0 dw 640, 400,256, 078h,0 dw 640, 480,256, 079h,0 dw 800, 600,256, 07bh,0 compaq_entries dw 0 dw 640, 480,256, 02eh,0fdh ; (non-standard mode flag) everex_entries dw 0 dw 752, 410, 16, 070h,01h dw 800, 600, 16, 070h,02h dw 1280, 350, 4, 070h,11h dw 1280, 600, 4, 070h,12h dw 640, 350,256, 070h,13h dw 640, 400,256, 070h,14h dw 512, 480,256, 070h,15h dw 1024, 768, 16, 070h,20h dw 640, 480,256, 070h,30h dw 800, 600,256, 070h,31h genoa_entries dw 0 dw 1024, 768, 4, 07fh,0 dw 720, 512, 16, 059h,0 dw 800, 600, 16, 079h,0 dw 1024, 768, 16, 05fh,0 dw 640, 350,256, 05bh,0 dw 640, 400,256, 07eh,0 dw 640, 480,256, 05ch,0 dw 720, 512,256, 05dh,0 dw 800, 600,256, 05eh,0 ncr_entries dw 0 dw 1024, 768, 2, 5ah,0 dw 800, 600, 16, 58h,0 dw 1024, 768, 16, 5dh,0 dw 640, 400,256, 5eh,0 dw 640, 480,256, 5fh,0 dw 800, 600,256, 5ch,0 dw 0 oaktech_entries dw 0 dw 800, 600, 16, 52h,0 dw 640, 480,256, 53h,0 dw 800, 600,256, 54h,0 dw 1024, 768, 16, 56h,0 dw 0 paradise_entries dw 0 dw 800, 600, 2, 059h,0 dw 800, 600, 16, 058h,0 dw 640, 400,256, 05eh,0 dw 640, 480,256, 05fh,0 dw 1024, 768, 16, 05dh,0 dw 800, 600,256, 05ch,0 ; Chuck Ebbert, 910524 trident_entries dw 0 dw 1024, 768, 4, 060h,0 dw 800, 600, 16, 05bh,0 dw 1024, 768, 16, 05fh,0 dw 640, 400,256, 05ch,0 dw 640, 480,256, 05dh,0 dw 800, 600,256, 05eh,0 dw 1024, 768,256, 062h,0 tseng_entries dw 0 dw 800, 600, 16, 029h,0 dw 1024, 768, 16, 037h,0 dw 640, 350,256, 02dh,0 dw 640, 400,256, 0,0feh ; (non-standard mode flag) dw 640, 480,256, 02eh,0 dw 720, 512,256, 02fh,0 dw 800, 600,256, 030h,0 dw 1024, 768,256, 038h,0 tseng4_entries dw 0 dw 800, 600, 16, 29h,0 dw 1024, 768, 16, 37h,0 dw 640, 350,256, 2dh,0 dw 640, 400,256, 2fh,0 dw 640, 480,256, 2eh,0 dw 800, 600,256, 30h,0 dw 1024, 768,256, 38h,0 video7_entries dw 0 dw 752, 410, 16, 6f05h,60h dw 720, 540, 16, 6f05h,61h dw 800, 600, 16, 6f05h,62h dw 1024, 768, 2, 6f05h,63h dw 1024, 768, 4, 6f05h,64h dw 1024, 768, 16, 6f05h,65h dw 640, 400,256, 6f05h,66h dw 640, 480,256, 6f05h,67h dw 720, 540,256, 6f05h,68h dw 800, 600,256, 6f05h,69h xga_entries dw 0 dw 1024, 768,256,0ffffh,02h dw 1024, 768, 16,0ffffh,03h dw 640, 400,256,0ffffh,04h dw 640, 480,256,0ffffh,04h dw 800, 600, 16,0ffffh,06h dw 800, 600,256,0ffffh,07h no_entries dw 0 dw 320, 200,256, 13h,0 dw 640, 480, 16, 12h,0 dw 0 .code newbank proc ;bank number is in AX cli mov OSEG[curbk],ax if @CodeSize call dword ptr OSEG[bankadr] else call word ptr OSEG[bankadr] endif ret newbank endp $tseng proc ;Tseng push ax push dx and al,7 mov ah,al shl ah,1 shl ah,1 shl ah,1 or al,ah or al,01000000b mov dx,3cdh out dx,al sti pop dx pop ax ret $tseng endp $tseng4 proc ;Tseng 4000 series push ax push dx mov ah,al mov dx,3bfh ;Enable access to extended registers mov al,3 out dx,al mov dl,0d8h mov al,0a0h out dx,al and ah,15 mov al,ah shl al,1 shl al,1 shl al,1 shl al,1 or al,ah mov dl,0cdh out dx,al sti pop dx pop ax ret $tseng4 endp $trident proc ;Trident push ax push dx mov dx,3ceh ;set page size to 64k mov al,6 out dx,al inc dl in al,dx dec dl or al,4 mov ah,al mov al,6 out dx,ax mov dl,0c4h ;switch to BPS mode mov al,0bh out dx,al inc dl in al,dx dec dl mov ah,byte ptr OSEG[curbk] xor ah,2 mov dx,3c4h mov al,0eh out dx,ax sti pop dx pop ax ret $trident endp $video7 proc ;Video 7 push ax push dx push cx ; Video-7 1024x768x16 mode patch (thanks to Frank Lozier 11/8/89). cmp colors,16 jne video7xx shl ax,1 shl ax,1 video7xx: and ax,15 mov ch,al mov dx,3c4h mov ax,0ea06h out dx,ax mov ah,ch and ah,1 mov al,0f9h out dx,ax mov al,ch and al,1100b mov ah,al shr ah,1 shr ah,1 or ah,al mov al,0f6h out dx,al inc dx in al,dx dec dx and al,not 1111b or ah,al mov al,0f6h out dx,ax mov ah,ch mov cl,4 shl ah,cl and ah,100000b mov dl,0cch in al,dx mov dl,0c2h and al,not 100000b or al,ah out dx,al sti pop cx pop dx pop ax ret $video7 endp $paradise proc ;Paradise push ax push dx mov dx,3ceh mov ax,50fh ;turn off write protect on VGA registers out dx,ax mov ah,byte ptr OSEG[curbk] shl ah,1 shl ah,1 shl ah,1 shl ah,1 mov al,9 out dx,ax mov ax,000Fh ;reprotect registers, 910512 out dx,ax sti pop dx pop ax ret $paradise endp $chipstech proc ;Chips & Tech push ax push dx mov dx,46e8h ;place chip in setup mode mov ax,1eh out dx,ax mov dx,103h ;enable extended registers mov ax,0080h ; (patched per JB's msg - Bert) out dx,ax mov dx,46e8h ;bring chip out of setup mode mov ax,0eh out dx,ax mov ah,byte ptr OSEG[curbk] shl ah,1 ;change 64k bank number into 16k bank number shl ah,1 mov al,10h mov dx,3d6h out dx,ax sti pop dx pop ax ret $chipstech endp $ativga proc ;ATI VGA Wonder push ax push dx mov ah,al mov dx,1ceh mov al,0b2h out dx,al inc dl in al,dx shl ah,1 and al,0e1h or ah,al mov al,0b2h dec dl out dx,ax sti pop dx pop ax ret $ativga endp $everex proc ;Everex push ax push dx push cx mov cl,al mov dx,3c4h mov al,8 out dx,al inc dl in al,dx dec dl shl al,1 shr cl,1 rcr al,1 mov ah,al mov al,8 out dx,ax mov dl,0cch in al,dx mov dl,0c2h and al,0dfh shr cl,1 jc nob2 or al,20h nob2: out dx,al sti pop cx pop dx pop ax ret $everex endp $aheada proc push ax push dx push cx mov ch,al mov dx,3ceh ;Enable extended registers mov ax,200fh out dx,ax mov dl,0cch ;bit 0 in al,dx mov dl,0c2h and al,11011111b shr ch,1 jnc temp_1 or al,00100000b temp_1: out dx,al mov dl,0cfh ;bits 1,2,3 mov al,0 out dx,al inc dx in al,dx dec dx and al,11111000b or al,ch mov ah,al mov al,0 out dx,ax sti pop cx pop dx pop ax ret $aheada endp $aheadb proc push ax push dx push cx mov ch,al mov dx,3ceh ;Enable extended registers mov ax,200fh out dx,ax mov ah,ch mov cl,4 shl ah,cl or ah,ch mov al,0dh out dx,ax sti pop cx pop dx pop ax ret $aheadb endp $oaktech proc ;Oak Technology Inc OTI-067 push ax push dx and al,15 mov ah,al shl al,1 shl al,1 shl al,1 shl al,1 or ah,al mov al,11h mov dx,3deh out dx,ax sti pop dx pop ax ret $oaktech endp $genoa proc ;GENOA GVGA push ax push dx mov ah,al shl al,1 shl al,1 shl al,1 or ah,al mov al,6 or ah,40h mov dx,3c4h out dx,ax sti pop dx pop ax ret $genoa endp $ncr proc ;NCR 77C22E push ax push dx shl al,1 ;change 64k bank number into 16k bank number shl al,1 mov ah,al mov al,18h mov dx,3c4h out dx,ax mov ax,19h out dx,ax sti pop dx pop ax ret $ncr endp $compaq proc ;Compaq push ax push dx mov dx,3ceh mov ax,50fh ;unlock extended registers out dx,ax mov ah,byte ptr OSEG[curbk] shl ah,1 ;change 64k bank number into 4k bank number shl ah,1 shl ah,1 shl ah,1 mov al,45h out dx,ax sti pop dx pop ax ret $compaq endp ; ; Read/Write 64K pages ; $vesa1 proc ; VESA bank switching push ax push bx push dx mul vesa_granularity ; Adjust for the granularity factor mov dx,ax ; Select window position mov bx,0 ; select window (bank) sub-command call dword ptr vesa_bankswitch ; do it! pop dx pop bx pop ax sti ret $vesa1 endp ; ; Read-only/Write-only 64K pages ; $vesa2 proc ; VESA bank switching push ax push bx push dx mul vesa_granularity ; Adjust for the granularity factor mov dx,ax ; Select window position push dx mov bx,0 ; select window (bank) sub-command call dword ptr vesa_bankswitch ; do it! pop dx inc bx call dword ptr vesa_bankswitch pop dx pop bx pop ax sti ret $vesa2 endp ; ; Read/Write 32K pages ; $vesa3 proc ; VESA bank switching push ax push bx push dx mul vesa_granularity ; Adjust for the granularity factor mov dx,ax ; Select window position push dx mov bx,vesa_low_window ; select window (bank) sub-command call dword ptr vesa_bankswitch ; do it! pop dx add dx,vesa_gran_offset ; 2nd window is at 32K offset from 1st mov bx,vesa_high_window call dword ptr vesa_bankswitch pop dx pop bx pop ax sti ret $vesa3 endp $vesa_nullbank proc ; null routine for vesa_bankswitch when unknown ret $vesa_nullbank endp $nobank proc sti ret $nobank endp bkadr macro flag,func,entries ; Bert mov video_entries, offset entries ; Bert mov [flag],1 mov [bankadr],offset func if @CodeSize mov [bankseg],seg func endif endm nojmp macro local lbl jmp lbl lbl: endm whichvga proc near push bp ; save it around all the int 10s cmp svga_type,0 ; was a SuperVGA adapter forced? jne type1_forced ; yup - wade through the options jmp not_forced ; nope - skip this section type1_forced: cmp svga_type,1 jne type2_forced bkadr aheada,$aheada,ahead_entries type2_forced: cmp svga_type,2 jne type3_forced bkadr ativga,$ativga,ati_entries type3_forced: cmp svga_type,3 jne type4_forced bkadr chipstech,$chipstech,chips_entries type4_forced: cmp svga_type,4 jne type5_forced bkadr everex,$everex,everex_entries type5_forced: cmp svga_type,5 jne type6_forced bkadr genoa,$genoa,genoa_entries type6_forced: cmp svga_type,6 jne type7_forced bkadr ncr,$ncr,ncr_entries type7_forced: cmp svga_type,7 jne type8_forced bkadr oaktech,$oaktech,oaktech_entries type8_forced: cmp svga_type,8 jne type9_forced bkadr paradise,$paradise,paradise_entries type9_forced: cmp svga_type,9 jne type10_forced bkadr trident,$trident,trident_entries type10_forced: cmp svga_type,10 jne type11_forced bkadr tseng,$tseng,tseng_entries type11_forced: cmp svga_type,11 jne type12_forced bkadr tseng4,$tseng4,tseng4_entries type12_forced: cmp svga_type,12 jne type13_forced bkadr video7,$video7,video7_entries type13_forced: cmp svga_type,13 jne type14_forced bkadr aheadb,$aheadb,ahead_entries type14_forced: jmp fini not_forced: cmp vesa_detect,0 ; is VESA-detection disabled? je notvesa ; yup - skip this mov ax,4f00h ; check for VESA adapter push ds ; set ES == DS pop es ; ... mov di, offset dacbox ; answer goes here (a safe place) int 10h ; do it. cmp ax,004fh ; successful response? jne notvesa ; nope. Not a VESA adapter cmp byte ptr 0[di],'V' ; string == 'VESA'? jne notvesa ; nope. Not a VESA adapter cmp byte ptr 1[di],'E' ; string == 'VESA'? jne notvesa ; nope. Not a VESA adapter cmp byte ptr 2[di],'S' ; string == 'VESA'? jne notvesa ; nope. Not a VESA adapter cmp byte ptr 3[di],'A' ; string == 'VESA'? jne notvesa ; nope. Not a VESA adapter bkadr vesa,$vesa_nullbank, vesa_entries jmp fini notvesa: call xga_detect ; XGA Adapter? cmp ax,0 je notxga ; nope bkadr xga,xga_newbank, xga_entries jmp fini notxga: mov si,1 mov ax,0c000h mov es,ax cmp word ptr es:[40h],'13' jnz noati bkadr ativga,$ativga,ati_entries ; Bert cli mov dx,1ceh mov al,0bbh out dx,al inc dl in al,dx sti and al,20h jz no512 mov [vga512],1 no512: jmp fini noati: mov ax,7000h ;Test for Everex xor bx,bx cld int 10h cmp al,70h jnz noev bkadr everex,$everex, everex_entries ; Bert and ch,11000000b jz temp_2 mov [vga512],1 temp_2: and dx,0fff0h cmp dx,6780h jz yeste cmp dx,2360h jnz note yeste: bkadr trident,$trident, everex_entries ; Bert mov everex,0 note: jmp fini noev: mov ax,0bf03h ;Test for Compaq xor bx,bx mov cx,bx int 10h cmp ax,0bf03h jnz nocp test cl,40h ;is 640x480x256 available? ;(??) jz nocp bkadr compaq,$compaq,compaq_entries ; Bert mov [vga512],1 jmp fini nocp: mov dx,3c4h ;Test for NCR 77C22E mov ax,0ff05h call $isport2 jnz noncr mov ax,5 ;Disable extended registers out dx,ax mov ax,0ff10h ;Try to write to extended register 10 call $isport2 ;If it writes then not NCR jz noncr mov ax,105h ;Enable extended registers out dx,ax mov ax,0ff10h call $isport2 jnz noncr ;If it does NOT write then not NCR bkadr ncr,$ncr,ncr_entries ; Bert mov [vga512],1 jmp fini noncr: mov dx,3c4h ;Test for Trident mov al,0bh out dx,al inc dl in al,dx cmp al,06h ja notri cmp al,2 jb notri bkadr trident,$trident, trident_entries ; Bert cmp al,3 jb no89 mov [t8900],1 mov dx,3d5h mov al,1fh out dx,al inc dx in al,dx and al,3 cmp al,1 jb notmem mov [vga512],1 je notmem mov [vga1024],1 notmem: jmp fini no89: mov [vga512],1 jmp fini notri: mov ax,6f00h ;Test for Video 7 xor bx,bx cld int 10h cmp bx,'V7' jnz nov7 bkadr video7,$video7, video7_entries ; Bert mov ax,6f07h cld int 10h and ah,7fh cmp ah,1 jbe temp_3 mov [vga512],1 temp_3: jmp fini nov7: mov dx,3d4h ;Test for GENOA GVGA mov ax,032eh ;check for Herchi Register call $isport2 jnz nogn mov dx,3c4h ;check for memory segment register mov ax,3f06h call $isport2 jnz nogn bkadr genoa,$genoa, genoa_entries ; Bert mov [vga512],1 jmp fini nogn: call $cirrus ;Test for Cirrus cmp [cirrus],0 je noci jmp fini noci: mov dx,3ceh ;Test for Paradise mov al,9 ;check Bank switch register out dx,al inc dx in al,dx dec dx or al,al jnz nopd mov ax,50fh ;turn off write protect on VGA registers out dx,ax mov dx,offset $pdrsub mov cx,1 call $chkbk jc nopd ;if bank 0 and 1 same not paradise bkadr paradise,$paradise, paradise_entries ; Bert mov dx,3ceh mov al,0bh ;512k detect from Bob Berry out dx,al inc dx in al,dx test al,80h ;if top bit set then 512k jz nop512 mov [vga512],1 nop512: jmp fini nopd: mov ax,5f00h ;Test for Chips & Tech xor bx,bx cld int 10h cmp al,5fh jnz noct bkadr chipstech,$chipstech, chips_entries ; Bert cmp bh,1 jb temp_5 mov [vga512],1 temp_5: jmp fini noct: mov ch,0 mov dx,3d4h ;check for Tseng 4000 series mov ax,0f33h call $isport2 jnz not4 mov ch,1 mov dx,3bfh ;Enable access to extended registers mov al,3 out dx,al mov dx,3d8h mov al,0a0h out dx,al jmp short yes4 not4: mov dx,3d4h ;Test for Tseng 3000 or 4000 mov ax,1f25h ;is the Overflow High register there? call $isport2 jnz nots mov al,03fh ;bottom six bits only jmp short yes3 yes4: mov al,0ffh yes3: mov dx,3cdh ;test bank switch register call $isport1 jnz nots bkadr tseng,$tseng, tseng_entries ; Bert cmp ch,0 jnz t4mem mov [vga512],1 jmp fini t4mem: mov dx,3d4h ;Tseng 4000 memory detect 1meg mov al,37h out dx,al inc dx in al,dx test al,1000b ;if using 64kx4 RAMs then no more than 256k jz nomem and al,3 cmp al,1 ;if 8 bit wide bus then only two 256kx4 RAMs jbe nomem mov [vga512],1 cmp al,2 ;if 16 bit wide bus then four 256kx4 RAMs je nomem mov [vga1024],1 ;full meg with eight 256kx4 RAMs nomem: bkadr tseng4,$tseng4, tseng4_entries ; Bert jmp fini nots: mov dx,3ceh ;Test for Above A or B chipsets mov ax,200fh out dx,ax inc dx nojmp in al,dx cmp al,21h jz verb cmp al,20h jnz noab bkadr aheada,$aheada, ahead_entries ; Bert mov [vga512],1 jmp short fini verb: bkadr aheadb,$aheadb, ahead_entries ; Bert mov [vga512],1 jmp short fini noab: mov dx,3deh ;Test for Oak Technology mov ax,0ff11h ;look for bank switch register call $isport2 jnz nooak bkadr oaktech,$oaktech, oaktech_entries ; Bert mov al,0dh out dx,al inc dx nojmp in al,dx test al,80h jz no4ram mov [vga512],1 no4ram: jmp short fini nooak: mov si,0 fini: mov ax,si pop bp ret whichvga endp $cirrus proc near mov dx,3d4h ; assume 3dx addressing mov al,0ch ; screen a start address hi out dx,al ; select index inc dx ; point to data mov ah,al ; save index in ah in al,dx ; get screen a start address hi xchg ah,al ; swap index and data push ax ; save old value push dx ; save crtc address xor al,al ; clear crc out dx,al ; and out to the crtc mov al,1fh ; Eagle ID register dec dx ; back to index out dx,al ; select index inc dx ; point to data in al,dx ; read the id register mov bh,al ; and save it in bh mov cl,4 ; nibble swap rotate count mov dx,3c4h ; sequencer/extensions mov bl,6 ; extensions enable register ror bh,cl ; compute extensions disable value mov ax,bx ; extensions disable out dx,ax ; disable extensions inc dx ; point to data in al,dx ; read enable flag or al,al ; disabled ? jnz exit ; nope, not an cirrus ror bh,cl ; compute extensions enable value dec dx ; point to index mov ax,bx ; extensions enable out dx,ax ; enable extensions inc dx ; point to data in al,dx ; read enable flag cmp al,1 ; enabled ? jne exit ; nope, not an cirrus mov [cirrus],1 mov video_entries, offset no_entries ; Bert mov [bankadr],offset $nobank if @CodeSize mov [bankseg],seg $nobank endif exit: pop dx ; restore crtc address dec dx ; point to index pop ax ; recover crc index and data out dx,ax ; restore crc value ret $cirrus endp $chkbk proc near ;paradise bank switch check mov di,0b800h mov es,di xor di,di mov bx,1234h call $gochk jnz nopd mov bx,4321h call $gochk jnz nopd clc ret nopd: stc ret $chkbk endp $gochk proc near push si mov si,bx mov al,cl call dx xchg bl,es:[di] mov al,ch call dx xchg bh,es:[di] xchg si,bx mov al,cl call dx xor bl,es:[di] mov al,ch call dx xor bh,es:[di] xchg si,bx mov al,ch call dx mov es:[di],bh mov al,cl call dx mov es:[di],bl mov al,0 call dx or si,si pop si ret $gochk endp $pdrsub proc near ;Paradise push dx mov ah,al mov dx,3ceh mov al,9 out dx,ax pop dx ret $pdrsub endp $isport2 proc near push bx mov bx,ax out dx,al mov ah,al inc dx in al,dx dec dx xchg al,ah push ax mov ax,bx out dx,ax out dx,al mov ah,al inc dx in al,dx dec dx and al,bh cmp al,bh jnz noport mov al,ah mov ah,0 out dx,ax out dx,al mov ah,al inc dx in al,dx dec dx and al,bh cmp al,0 noport: pop ax out dx,ax pop bx ret $isport2 endp $isport1 proc near mov ah,al in al,dx push ax mov al,ah out dx,al in al,dx and al,ah cmp al,ah jnz noport mov al,0 out dx,al in al,dx and al,ah cmp al,0 noport: pop ax out dx,al ret $isport1 endp videowrite proc near ; your-own-video write routine mov ah,0 ; clear the high-order color byte push ax ; colors parameter push dx ; 'y' parameter push cx ; 'x' parameter call far ptr writevideo ; let the external routine do it add sp,6 ; pop the parameters ret ; we done. videowrite endp videoread proc near ; your-own-video read routine push dx ; 'y' parameter push cx ; 'x' parameter call far ptr readvideo ; let the external routine do it add sp,4 ; pop the parameters ret ; we done. videoread endp diskwrite proc near ; disk-video write routine push ax ; colors parameter push dx ; 'y' parameter push cx ; 'x' parameter call far ptr writedisk ; let the external routine do it add sp,6 ; pop the parameters ret ; we done. diskwrite endp diskread proc near ; disk-video read routine push dx ; 'y' parameter push cx ; 'x' parameter call far ptr readdisk ; let the external routine do it add sp,4 ; pop the parameters ret ; we done. diskread endp ; *********************************************************************** ; ; TARGA MODIFIED 1 JUNE 89 - j mclain ; tgawrite proc near push ax ; colors parameter push dx ; 'y' parameter push cx ; 'x' parameter call far ptr WriteTGA ; writeTGA( x, y, color ) add sp,6 ; pop the parameters ret tgawrite endp tgaread proc near push dx ; 'y' parameter push cx ; 'x' parameter call far ptr ReadTGA ; readTGA( x, y ) add sp,4 ; pop the parameters ret tgaread endp ; TARGA+ Code 2-11-91, Mark Peterson TPlusWrite PROC NEAR push ax push dx push cx call FAR PTR WriteTPlusBankedPixel add sp, 6 ret TPlusWrite ENDP TPlusRead PROC NEAR push dx push cx call FAR PTR ReadTPlusBankedPixel add sp, 4 ret TPlusRead ENDP f85start proc near call far ptr open8514 ret f85start endp f85end proc near call far ptr close8514 ret f85end endp f85write proc near call far ptr fr85wdot ret f85write endp f85read proc near call far ptr fr85rdot ret f85read endp hgcwrite proc near mov ah,0 ; clear the high-order color byte push ax ; colors parameter push dx ; 'y' parameter push cx ; 'x' parameter call far ptr writehgc ; let the Herc. Write dot routine do it add sp,6 ; pop the parameters ret hgcwrite endp hgcread proc near push dx ; 'y' parameter push cx ; 'x' parameter call far ptr readhgc ; call the Hercules Read dot routine add sp,4 ; pop the parameters ret hgcread endp hgcstart proc near ; hercules start routine call far ptr inithgc ; let the external routine do it ret ; we done. hgcstart endp hgcend proc near ; hercules end routine call far ptr termhgc ; let the external routine do it ret ; we done. hgcend endp ; **************** video adapter initialization ******************* ; ; adapter_init: ; called from general.asm once per run adapter_init proc far ; initialize the video adapter (to VGA) mov ax,[bankadr] ; Initialize the bank-switching mov video_bankadr,ax ; logic to the do-nothing routine mov ax,[bankseg] ; ... mov video_bankseg,ax ; ... mov bx,0 ; clear out all of the 256-mode flags mov tseng,bx ; ... mov trident,bx ; ... mov video7,bx ; ... mov paradise,bx ; ... mov chipstech,bx ; ... mov ativga,bx ; ... mov everex,bx ; ... mov cirrus,bx ; ... mov aheada,bx ; ... mov aheadb,bx ; ... mov tseng4,bx ; ... mov oaktech,bx ; ... mov [bankadr],offset $nobank mov [bankseg],seg $nobank mov video_entries, offset no_entries ; ... ret adapter_init endp ; adapter_detect: ; This routine performs a few quick checks on the type of ; video adapter installed. ; It sets variables video_type and textsafe, ; and fills in a few bank-switching routines. adapter_detect proc uses di si es push bp ; some bios's don't save during int 10h cmp done_detect,0 ; been called already? je adapter_detect2 ; nope jmp adapter_ret ; yup, do nothing adapter_detect2: inc done_detect ; don't get called again cmp video_type,0 ; video_type preset by command line arg? jne go_adapter_set ; yup, use what we're told cmp TPlusFlag, 0 je NotTPlus call far ptr CheckForTPlus or ax, ax jz NotTPlus mov TPlusInstalled, 1 ; flag it and check for primary adapter NotTPlus: mov ax,1a00h ; start by trying int 10 func 1A int 10h ; ... cmp al,1ah ; was AL modified? je adapter_detect_4 ; yup. go decode what we got mov ax,1200h ; try this vga-only function mov bl,34h ; enable cursor emulation int 10h ; ... cmp al,12h ; did it work? je adapter_detect_vga ; yup, vga mov ah,12h ; look for an EGA mov bl,10h ; by using an EGA-specific call int 10h ; ... cmp bl,10h ; was BL modified? je adapter_detect_notega ; nope, < EGA mov video_type,3 ; set the video type: EGA cmp bh,1 ; monochrome monitor? jne go_adapter_set ; nope mov mode7text,1 ; yup, use mode 7 for text jmp short go_adapter_set ; We done. adapter_detect_4: cmp bl,1 ; =1? jne adapter_detect_4a ; nope jmp adapter_detect_hgc ; MDA, assume HGC (nothing else works) adapter_detect_4a: mov video_type,2 ; set the video type: CGA cmp bl,3 ; <=2? jb go_adapter_set ; exit with type CGA mov video_type,3 ; set the video type: EGA cmp bl,5 ; =5? jne adapter_detect_5 ; nope mov mode7text,1 ; yup, monochrome monitor, mode 7 text go_adapter_set: jmp adapter_set adapter_detect_5: cmp bl,6 ; <=5? jb go_adapter_set ; exit with type EGA cmp bl,10 ; <=9? jb adapter_detect_vga ; vga, go check which kind mov video_type,4 ; set the video type: MCGA cmp bl,13 ; <=12? jb go_adapter_set ; exit with type MCGA adapter_detect_vga: mov video_type,5 ; set the video type: VGA call whichvga ; autodetect which VGA is there mov ax,[bankadr] ; save the results mov video_bankadr,ax ; ... mov ax,[bankseg] ; ... mov video_bankseg,ax ; ... jmp adapter_set adapter_detect_notega: mov video_type,2 ; set the video type: CGA ; HGC detect code from book by Richard Wilton follows mov dx,3B4h ; check for MDA, use MDA CRTC address mov al,0Fh ; select 6845 reg 0Fh (Cursor Low) out dx,al inc dx in al,dx ; AL := current Cursor Low value mov ah,al ; preserve in AH mov al,66h ; AL := arbitrary value out dx,al ; try to write to 6845 mov cx,200h mdalp: loop mdalp ; wait for 6845 to respond in al,dx ; read cursor low again xchg ah,al out dx,al ; restore original value cmp ah,66h ; test whether 6845 responded jne adapter_set ; nope, exit with type CGA mov dl,0BAh ; DX := 3BAh (status port) in al,dx and al,80h mov ah,al ; AH := bit 7 (vertical sync on HGC) mov cx,8000h ; do this 32768 times mdalp2: in al,dx and al,80h ; isolate bit 7 cmp ah,al loope mdalp2 ; wait for bit 7 to change je adapter_set ; didn't change, exit with type CGA ;; in al,dx ;; and al,01100000b ; mask off bits 5 and 6 ;; Next line probably backwards but doesn't matter, the test in this area ;; distinguishes HGC/HGC+/InColor, which we don't care about anyway. ;; jnz adapter_set ; not hgc/hgc+, exit with type CGA adapter_detect_hgc: mov video_type,1 ; HGC mov mode7text,1 ; use mode 7 for text adapter_set: ; ensure a nice safe standard state mov ax,3 ; set 80x25x16 text mode, clear screen cmp mode7text,0 ; use mode 7 for text? je adapter_set2 ; nope mov ax,7 ; set mono text mode, clear screen adapter_set2: int 10h ; set text mode mov ax,0500h ; select display page zero int 10h ; ... ; now the color text stuff cmp textsafe,2 ; command line textsafe=no? je adapter_go_ret ; yup, believe the user cmp video_type,3 ; >= ega? jae adapter_setup ; yup mov textsafe,2 ; textsafe=no adapter_go_ret: ; a label for some short jumps jmp adapter_ret ; to the exit adapter_setup: ; more standard state, ega and up stuff mov ax,1003h ; top attribute bit means blink mov bl,01h ; ... int 10h ; ... mov ax,1103h ; font block 0, 256 chars (not 512) mov bl,00h ; ... int 10h ; ... mov ax,1202h ; 400 scan lines in text mode (vga) mov bl,30h ; ... int 10h ; ... mov ax,1200h ; cga cursor emulation (vga) mov bl,34h ; ... int 10h ; ... mov ax,1200h ; enable default palette loading mov bl,31h ; ... int 10h ; ... cmp textsafe,0 ; were we told textsafe=yes|bios|save? jne adapter_ret ; yup mov textsafe,1 ; set textsafe=yes adapter_ret: cld ; some MSC 6.0 libraries assume this! pop bp ret adapter_detect endp ; select_vga_plane: ; Call this routine with cx = plane number. ; It works for vga and for ega. (I hope.) ; It uses no local variables, caller may have ds register modified. ; On return from this routine, the requested vid mem plane is mapped ; to A0000; this means that the sequencer and graphics controller ; states are not very useful for further real work - before any further ; screen painting, better reset video mode. select_vga_plane proc near ; cl = plane number ; some callers may have ds modified, use no variables in here! mov dx,SC_INDEX ; sequencer controller mov ax,0102h ; select plane shl ah,cl ; bit for desired plane out dx,ax ; ... mov ax,0604h ; no chaining out dx,ax ; ... mov dx,GC_INDEX ; graphics controller mov ax,0001h ; use processor data out dx,ax ; ... mov al, 04h ; select read plane mov ah,cl ; desired plane out dx,ax ; ... mov ax,0005h ; no even/odd, write mode 0 out dx,ax ; ... mov ax,0106h ; map to a000, no chain, graphics out dx,ax ; ... mov ax,0ff08h ; enable 8 bits per write out dx,ax ; ... ret ; all done select_vga_plane endp ; **************** internal Read/Write-a-line routines ********************* ; ; These routines are called by out_line(), put_line() and get_line(). ; They assume the following register values: ; ; si = offset of array of colors for a row (write routines) ; di = offset of array of colors for a row (read routines) ; ; ax = stopping column ; bx = ; cx = starting column ; dx = row ; ; Note: so far have converted only normaline, normalineread, mcgaline, ; mcgareadline, super256line, super256readline -- Tim normaline proc near ; Normal Line normal_line1: push ax ; save stop col mov al,[si] ; retrieve the color xor ah,ah ; MCP 6-7-91 push cx ; save the counter around the call push dx ; save column around the call push si ; save the pointer around the call also call dotwrite ; write the dot via the approved method pop si ; restore the pointer pop dx ; restore the column pop cx ; restore the counter inc si ; bump it up inc cx ; bump it up pop ax ; retrieve number of dots cmp cx,ax ; more to go? jle normal_line1 ; yup. do it. ret normaline endp normalineread proc near ; Normal Line mov bx,videomem mov es,bx normal_lineread1: push ax ; save stop col push cx ; save the counter around the call push dx ; save column around the call push di ; save the pointer around the call also call dotread ; read the dot via the approved method pop di ; restore the pointer pop dx ; restore the column pop cx ; restore the counter mov bx,di ; locate the actual pixel color mov [bx],al ; retrieve the color inc di ; bump it up inc cx ; bump it up pop ax ; retrieve number of dots cmp cx,ax ; more to go? jle normal_lineread1 ; yup. do it. ret normalineread endp mcgaline proc near ; MCGA 320*200, 246 colors sub ax,cx ; last col - first col inc ax ; + 1 xchg dh,dl ; bx := 256*y mov bx,cx ; bx := x add bx,dx ; bx := 256*y + x shr dx,1 shr dx,1 ; dx := 64*y add bx,dx ; bx := 320*y + x mov di,bx ; di = offset of row in video memory mov cx,ax ; move this many bytes rep movsb ; zap line into memory ret mcgaline endp mcgareadline proc near ; MCGA 320*200, 246 colors sub ax,cx ; last col - first col inc ax ; + 1 xchg dh,dl ; bx := 256*y mov bx,cx ; bx := x add bx,dx ; bx := 256*y + x shr dx,1 shr dx,1 ; dx := 64*y add bx,dx ; bx := 320*y + x mov si,bx ; di = offset of row in video memory mov cx,ax ; move this many bytes mov ax,ds ; copy data segment to ... mov es,ax ; ... es mov ax,videomem ; copy video segment to ... mov ds,ax ; ... ds rep movsb ; zap line into memory mov ax,es mov ds,ax ; restore data segement to ds ret mcgareadline endp vgaline proc near ; Bank Switch EGA/VGA line write push cx ; save a few registers push ax ; ... push dx ; ... mov bx,dx ; save the rowcount mov ax,vxdots ; compute # of dots / pass shr ax,1 ; (given 8 passes) shr ax,1 ; ... shr ax,1 ; ... mov di,ax neg di ; temp: to see if line will overflow mul bx ; now calc first video addr cmp dx,curbk ; see if bank changed jne bank_is_changing ; if bank change call normaline cmp ax,di ja bank_is_changing ; if bank WILL change, call normaline mov di,cx ; compute the starting destination shr di,1 ; divide by 8 shr di,1 ; ... shr di,1 ; ... add di,ax ; add the first pixel offset mov dx,03ceh ; set up graphics cntrlr addr mov ax,8008h ; set up for the bit mask and cx,7 ; adjust for the first pixel offset ror ah,cl ; ... pop bx ; flush old DX value pop bx ; flush old AX value pop cx ; flush old CX value sub bx,cx ; convert to a length value add bx,si ; locate the last source locn mov cx,ax ; save the bit mask vgaline1: out dx,ax ; set the graphics bit mask push ax ; save registers for a tad push si ; ... push di ; ... vgaline2: mov ah,ds:[si] ; get the color mov al,0 ; set set/reset registers out dx,ax ; do it. mov ax,0f01h ; enable set/reset registers out dx,ax ; do it. or es:[di],al ; update all bit planes inc di ; set up the next video addr add si,8 ; and the next source addr cmp si,bx ; are we beyond the end? jbe vgaline2 ; loop if more dots this pass pop di ; restore the saved registers pop si ; ... pop ax ; ... inc si ; offset the source 1 byte cmp si,bx ; are we beyond the end? ja vgaline4 ; stop if no more dots this pass ror ah,1 ; alter bit mask value cmp ah,80h ; time to update DI: jne vgaline3 ; nope inc di ; yup vgaline3: cmp ah,ch ; already done all 8 of them? jne vgaline1 ; nope. do another one. vgaline4: ;;; call videocleanup ; else cleanup time. ret ; and we done. bank_is_changing: pop dx ; restore the registers pop ax ; ... pop cx ; ... call normaline ; just calling newbank didn't quite ret ; work. This depends on no bank vgaline endp ; change mid line (ok for 1024 wide) vgareadline proc near ; Bank Switch EGA/VGA line read push cx ; save a few registers push ax ; ... push dx ; ... mov bx,dx ; save the rowcount mov ax,vxdots ; compute # of dots / pass shr ax,1 ; (given 8 passes) shr ax,1 ; ... shr ax,1 ; ... mul bx ; now calc first video addr cmp dx,curbk ; see if bank changed jne bank_is_changing ; if bank change call normaline mov si,cx ; compute the starting destination shr si,1 ; divide by 8 shr si,1 ; ... shr si,1 ; ... add si,ax ; add the first pixel offset and cx,7 ; adjust for the first pixel offset mov ch,cl ; save the original offset value pop bx ; flush old DX value pop bx ; flush old AX value pop ax ; flush old CX value sub bx,ax ; convert to a length value add bx,di ; locate the last dest locn mov ax,0a000h ; EGA/VGA screen starts here mov es,ax ; ... mov dx,03ceh ; set up graphics cntrlr addr vgaline1: push bx ; save BX for a tad mov ch,80h ; bit mask to shift shr ch,cl ; ... mov bx,0 ; initialize bits-read value (none) mov ax,0304h ; set up controller address register vgareadloop: out dx,ax ; do it mov bh,es:[si] ; retrieve the old value and bh,ch ; mask one bit neg bh ; set bit 7 correctly rol bx,1 ; rotate the bit into bl dec ah ; go for another bit? jge vgareadloop ; sure, why not. mov ds:[di],bl ; returned pixel value pop bx ; restore BX inc di ; set up the next dest addr cmp di,bx ; are we beyond the end? ja vgaline3 ; yup. We done. inc cl ; alter bit mask value cmp cl,8 ; time to update SI: jne vgaline2 ; nope inc si ; yup mov cl,0 ; ... vgaline2: jmp short vgaline1 ; do another one. vgaline3: ;;; call videocleanup ; else cleanup time. ret ; and we done. bank_is_changing: pop dx ; restore the registers pop ax ; ... pop cx ; ... call normalineread ; just calling newbank didn't quite ret ; work. This depends on no bank vgareadline endp ; change mid line (ok for 1024 wide) super256lineaddr proc near ; super VGA 256 colors mov ax,vxdots ; this many dots / line mov bx,dx ; rowcount mul bx ; times this many lines push ax ; save pixel address for later cmp dx,curbk ; bank ok? push dx ; save bank je bank_is_ok ; jump if bank ok mov al,dl ; newbank needs bank in al call far ptr newbank bank_is_ok: inc bx ; next row mov ax,vxdots ; this many dots / line mul bx ; times this many lines sub ax,1 ; back up some to the last pixel of the sbb dx,0 ; previous line pop bx ; bank at start of row pop ax ; ax = offset of row in video memory ret super256lineaddr endp super256line proc near ; super VGA 256 colors push ax ; stop col push dx ; row call super256lineaddr ; ax=video,dl=newbank,bl=oldbank mov di,ax ; video offset cmp dl,bl ; did bank change? pop dx ; row pop ax ; stop col jne bank_did_chg add di,cx ; add start col to video address sub ax,cx ; ax = stop - start mov cx,ax ; + start column inc cx ; number of bytes to move rep movsb ; zap line into memory jmp short linedone bank_did_chg: call normaline ; normaline can handle bank change linedone: ret super256line endp super256readline proc near ; super VGA 256 colors push ax ; stop col push dx ; row call super256lineaddr ; ax=video,dl=newbank,bl=oldbank mov si,ax ; video offset cmp dl,bl ; did bank change? pop dx ; row pop ax ; stop col jne bank_did_chg add si,cx ; add start col to video address sub ax,cx ; ax = stop - start mov cx,ax ; + start column inc cx ; number of bytes to move mov ax,ds ; save data segment to es mov es,ax mov ax,videomem ; video segment to es mov ds,ax rep movsb ; zap line into memory mov ax,es ; restore data segment to ds mov ds,ax jmp short linedone bank_did_chg: call normalineread ; normaline can handle bank change linedone: ret super256readline endp tweak256line proc near ; Normal Line: no assumptions local plane:byte mov bx,ax ; bx = stop col sub bx,cx ; bx = stop-start inc bx ; bx = how many pixels to write cmp bx,3 ; less than four points? jg nottoosmall ; algorithm won't work as written call normaline ; - give up and call normaline ret ; we done nottoosmall: ; at least four points - go for it! push bx ; save number of pixels and bx,3 ; pixels modulo 4 = no of extra pts mov ax,vxdots ; width of video row ;; shr ax, 1 ;; shr ax, 1 ; now ax = vxdots/4 mul dx ; ax points to start of desired row push cx ; Save starting column for later shr cx,1 ; There are 4 pixels at each address shr cx,1 ; so divide X by 4 add ax,cx ; Point to pixel's address mov di,ax ; video offset of first point pop cx ; Retrieve starting column and cl,3 ; Get the plane number of the pixel mov ah,1 shl ah,cl ; Set the bit corresponding to the plane ; the pixel is in mov plane,ah ; Save starting plane for ending test mov al,MAP_MASK ; mov dx,SC_INDEX pop cx ; number of pixels to write shr cx,1 shr cx,1 ; cx = number of pixels/4 cmp bx,0 ; extra pixels? je tweak256line1 ; nope - don't add one inc cx ; yup - add one more pixel tweak256line1: OUT DX,AX ; set up VGA registers for plane push cx ; save registers changed by movsb push si ; ... push di ; ... tweak256line2: movsb ; move the next pixel add si,3 ; adjust the source addr (+4, not +1) loop tweak256line2 ; loop if more dots this pass pop di ; restore the saved registers pop si ; ... pop cx ; ... dec bx ; one less extra pixel cmp bx,0 ; out of extra pixels? jne noextra dec cx ; yup - next time one fewer to write noextra: inc si ; offset the source 1 byte shl ah,1 ; set up for the next video plane cmp ah,16 ; at last plane? jne notlastplane mov ah,1 ; start over with plane 0 inc di ; bump up video memory notlastplane: cmp ah,plane ; back to first plane? jne tweak256line1 ; nope. perform another loop. ret tweak256line endp tweak256readline proc near ; Normal Line: no assumptions local plane:byte mov bx,ax ; bx = stop col sub bx,cx ; bx = stop-start inc bx ; bx = how many pixels to write cmp bx,3 ; less than four points? jg nottoosmall ; algorithm won't work as written call normalineread ; - give up and call normalineread ret ; we done nottoosmall: ; at least four points - go for it! push bx ; save number of pixels and bx,3 ; pixels modulo 4 = no of extra pts mov ax,vxdots ; width of video row ;; shr ax, 1 ;; shr ax, 1 ; now ax = vxdots/4 mul dx ; ax points to start of desired row push cx ; Save starting column for later shr cx,1 ; There are 4 pixels at each address shr cx,1 ; so divide X by 4 add ax,cx ; Point to pixel's address mov si,ax pop cx ; Retrieve starting column and cl,3 ; Get the plane number of the pixel mov ah,cl mov plane,ah ; Save starting plane mov al,READ_MAP mov dx,GC_INDEX pop cx ; number of pixels to write shr cx,1 shr cx,1 ; cx = number of pixels/4 cmp bx,0 ; extra pixels? je tweak256line1 ; nope - don't add one inc cx ; yup - add one more pixel tweak256line1: out dx,ax push ax ; save registers push cx ; ... push di ; ... push si ; ... mov ax,ds ; copy data segment to es mov es,ax ; ... mov ax,videomem ; copy video segment to ds mov ds,ax ; ... tweak256line2: movsb ; move the next pixel add di,3 ; adjust the source addr (+4, not +1) loop tweak256line2 ; loop if more dots this pass mov ax,es mov ds,ax ; restore data segement to ds pop si ; restore the saved registers pop di ; ... pop cx ; ... pop ax ; ... dec bx ; one less extra pixel cmp bx,0 ; out of extra pixels? jne noextra dec cx ; yup - next time one fewer to write noextra: inc di ; offset the source 1 byte inc ah ; set up for the next video plane and ah,3 cmp ah,0 ; at last plane? jne notlastplane inc si ; bump up video memory notlastplane: cmp ah,plane ; back to first plane? jne tweak256line1 ; nope. perform another loop. ret tweak256readline endp f85line proc near call fr85wbox ;put out the box ret f85line endp f85readline proc near call fr85rbox ;read the box ret f85readline endp ; ******************** Function videocleanup() ************************** ; Called at the end of any assembler video read/writes to make ; the world safe for 'printf()'s. ; Currently, only ega/vga needs cleanup work, but who knows? ; ;;videocleanup proc near ;; mov ax,dotwrite ; check: were we in EGA/VGA mode? ;; cmp ax,offset vgawrite ; ... ;; jne short videocleanupdone ; nope. no adjustments ;; mov dx,03ceh ; graphics controller address ;; mov ax,0ff08h ; restore the default bit mask ;; out dx,ax ; ... ;; mov ax,0003h ; restore the function select ;; out dx,ax ; ... ;; mov ax,0001h ; restore the enable set/reset ;; out dx,ax ; ... ;;videocleanupdone: ;; ret ;;videocleanup endp ; ******************** Zoombox functions ************************** clearbox proc uses di si es mov xorTARGA,1 ; faster to flag xorTARGA rather ; than check if TARGA is runnin mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; save it here during this routine mov bx,boxcount ; load up a counter: # points to clear dec bx ; switch to an offset value eraseoldbox: shl bx,1 ; switch to a word pointer mov cx,boxx[bx] ; get the (previous) point location mov dx,boxy[bx] ; ... shr bx,1 ; switch back to character pointer mov al,boxvalues[bx] ; get the (previous) color push bx ; save the counter call dotwrite ; adjust the dot. pop bx ; restore the counter dec bx ; are we done yet? jns eraseoldbox ; nope. try again. mov xorTARGA,0 ; in case of TARGA, no more xor ;;; call videocleanup ; perform any video cleanup required ret ; we done. clearbox endp dispbox proc uses di si es mov xorTARGA,1 ; faster to flag xorTARGA rather ; than check if TARGA is runnin mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; save it here during this routine mov bx,boxcount ; load up a counter: # points to draw dec bx ; switch to an offset readnewbox: shl bx,1 ; switch to word counter mov cx,boxx[bx] ; get the (new) point location mov dx,boxy[bx] ; ... shr bx,1 ; switch back to character counter push bx ; save the counter call dotread ; read the (previous) dot value pop bx ; restore the counter mov boxvalues[bx],al ; get the (previous) color dec bx ; are we done yet? jns readnewbox ; nope. try again. mov bx,boxcount ; load up a counter: # points to draw dec bx ; switch to an offset drawnewbox: shl bx,1 ; switch to word counter mov cx,boxx[bx] ; get the (new) point location mov dx,boxy[bx] ; ... shr bx,1 ; switch back to character counter mov ax,colors ; set the (new) box color dec ax and ax,boxcolor cmp colors,2 ; uhh, is this a B&W screen? jne drawnewnotbw ; nope. proceed mov al,1 ; XOR the old color sub al,boxvalues[bx] ; for visibility drawnewnotbw: push bx ; save the counter call dotwrite ; adjust the dot. pop bx ; restore the counter dec bx ; are we done yet? jns drawnewbox ; nope. try again. mov xorTARGA,0 ; in case of TARGA, no more xor ;;; call videocleanup ; perform any video cleanup required ret ; we done. dispbox endp ; ********************** Function setvideotext() ************************ ; Sets video to text mode, using setvideomode to do the work. setvideotext proc sub ax,ax mov dotmode,ax ; make this zero to avoid trouble push ax push ax push ax mov ax,3 push ax call far ptr setvideomode ; (3,0,0,0) add sp,8 ret setvideotext endp ; **************** Function setvideomode(ax, bx, cx, dx) **************** ; This function sets the (alphanumeric or graphic) video mode ; of the monitor. Called with the proper values of AX thru DX. ; No returned values, as there is no particular standard to ; adhere to in this case. ; (SPECIAL "TWEAKED" VGA VALUES: if AX==BX==CX==0, assume we have a ; genuine VGA or register compatable adapter and program the registers ; directly using the coded value in DX) setvideomode proc uses di si es,argax:word,argbx:word,argcx:word,argdx:word mov ax,sxdots ; initially, set the virtual line mov vxdots,ax ; to be the scan line length cmp dotmode, 29 jne NotTrueColorMode jmp TrueColorAuto NotTrueColorMode: cmp diskflag,1 ; is disk video active? jne nodiskvideo ; nope. call far ptr enddisk ; yup, external disk-video end routine nodiskvideo: cmp videoflag,1 ; say, was the last video your-own? jne novideovideo ; nope. call far ptr endvideo ; yup, external your-own end routine mov videoflag,0 ; set flag: no your-own-video jmp short notarga novideovideo: cmp tgaflag,1 ; TARGA MODIFIED 2 June 89 j mclain jne notarga call far ptr EndTGA ; endTGA( void ) mov tgaflag,0 ; set flag: targa cleaned up notarga: cmp xga_isinmode,0 ; XGA in graphics mode? je noxga ; nope mov ax,0 ; pull it out of graphics mode push ax mov xga_clearvideo,al call far ptr xga_mode pop ax noxga: cmp f85flag, 1 ; was the last video 8514? jne no8514 ; nope. call f85end mov f85flag, 0 no8514: cmp HGCflag, 1 ; was last video Hercules jne noHGC ; nope call hgcend mov HGCflag, 0 noHGC: mov oktoprint,1 ; say it's OK to use printf() mov goodmode,1 ; assume a good video mode mov xga_loaddac,1 ; tell the XGA to fake a 'loaddac' mov ax,video_bankadr ; restore the results of 'whichvga()' mov [bankadr],ax ; ... mov ax,video_bankseg ; ... mov [bankseg],ax ; ... mov ax,argax ; load up for the interrupt call mov bx,argbx ; ... mov cx,argcx ; ... mov dx,argdx ; ... mov videoax,ax ; save the values for future use mov videobx,bx ; ... mov videocx,cx ; ... mov videodx,dx ; ... call setvideo ; call the internal routine first cmp goodmode,0 ; is it still a good video mode? jne videomodeisgood ; yup. mov ax,offset nullwrite ; set up null write-a-dot routine mov bx,offset mcgaread ; set up null read-a-dot routine mov cx,offset normaline ; set up normal linewrite routine mov dx,offset mcgareadline ; set up normal linewrite routine mov si,offset swapnormread ; set up the normal swap routine jmp videomode ; return to common code videomodeisgood: mov bx,dotmode ; set up for a video table jump cmp bx,30 ; are we within the range of dotmodes? jbe videomodesetup ; yup. all is OK mov bx,0 ; nope. use dullnormalmode videomodesetup: shl bx,1 ; switch to a word offset mov bx,cs:videomodetable[bx] ; get the next step jmp bx ; and go there videomodetable dw offset dullnormalmode ; mode 0 dw offset dullnormalmode ; mode 1 dw offset vgamode ; mode 2 dw offset mcgamode ; mode 3 dw offset tseng256mode ; mode 4 dw offset paradise256mode ; mode 5 dw offset video7256mode ; mode 6 dw offset tweak256mode ; mode 7 dw offset everex16mode ; mode 8 dw offset targaMode ; mode 9 dw offset hgcmode ; mode 10 dw offset diskmode ; mode 11 dw offset f8514mode ; mode 12 dw offset cgamode ; mode 13 dw offset tandymode ; mode 14 dw offset trident256mode ; mode 15 dw offset chipstech256mode ; mode 16 dw offset ati256mode ; mode 17 dw offset everex256mode ; mode 18 dw offset yourownmode ; mode 19 dw offset ati1024mode ; mode 20 dw offset tseng16mode ; mode 21 dw offset trident16mode ; mode 22 dw offset video716mode ; mode 23 dw offset paradise16mode ; mode 24 dw offset chipstech16mode ; mode 25 dw offset everex16mode ; mode 26 dw offset VGAautomode ; mode 27 dw offset VESAmode ; mode 28 dw offset TrueColorAuto ; mode 29 dw offset dullnormalmode ; mode 30 dw offset dullnormalmode ; mode 31 tandymode: ; from Joseph Albrecht mov tandyseg,0b800h ; set video segment address mov tandyofs,0 ; set video offset address mov ax,offset plottandy16 ; set up write-a-dot mov bx,offset gettandy16 ; set up read-a-dot mov cx,offset normaline ; set up the normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si,offset swapnormread ; set up the normal swap routine cmp videoax,8 ; check for 160x200x16 color mode je tandy16low ; .. cmp videoax,9 ; check for 320x200x16 color mode je tandy16med ; .. cmp videoax,0ah ; check for 640x200x4 color mode je tandy4high ; .. cmp videoax,0bh ; check for 640x200x16 color mode je tandy16high ; .. tandy16low: mov tandyscan,offset scan16k; set scan line address table jmp videomode ; return to common code tandy16med: mov tandyscan,offset scan32k; set scan line address table jmp videomode ; return to common code tandy4high: mov ax,offset plottandy4 ; set up write-a-dot mov bx,offset gettandy4 ; set up read-a-dot jmp videomode ; return to common code tandy16high: mov tandyseg,0a000h ; set video segment address mov tandyofs,8000h ; set video offset address mov tandyscan,offset scan64k; set scan line address table jmp videomode ; return to common code dullnormalmode: mov ax,offset normalwrite ; set up the BIOS write-a-dot routine mov bx,offset normalread ; set up the BIOS read-a-dot routine mov cx,offset normaline ; set up the normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si,offset swapnormread ; set up the normal swap routine jmp videomode ; return to common code mcgamode: mov ax,offset mcgawrite ; set up MCGA write-a-dot routine mov bx,offset mcgaread ; set up MCGA read-a-dot routine mov cx,offset mcgaline ; set up the MCGA linewrite routine mov dx,offset mcgareadline ; set up the MCGA lineread routine mov si,offset swap256 ; set up the MCGA swap routine jmp videomode ; return to common code tseng16mode: mov tseng,1 ; set chipset flag mov [bankadr],offset $tseng mov [bankseg],seg $tseng jmp vgamode ; set ega/vga functions trident16mode: mov trident,1 ; set chipset flag mov [bankadr],offset $trident mov [bankseg],seg $trident jmp vgamode video716mode: mov video7,1 ; set chipset flag mov [bankadr],offset $video7 mov [bankseg],seg $video7 jmp vgamode paradise16mode: mov paradise,1 ; set chipset flag mov [bankadr],offset $paradise mov [bankseg],seg $paradise jmp vgamode chipstech16mode: mov chipstech,1 ; set chipset flag mov [bankadr],offset $chipstech mov [bankseg],seg $chipstech jmp vgamode everex16mode: mov everex,1 ; set chipset flag mov [bankadr],offset $everex mov [bankseg],seg $everex jmp vgamode VESAmode: ; set VESA 16-color mode mov ax,word ptr vesa_mapper mov [bankadr],ax mov ax,word ptr vesa_mapper+2 mov [bankseg],ax VGAautomode: ; set VGA auto-detect mode cmp colors,256 ; 256 colors? je VGAauto256mode ; just like SuperVGA cmp xga_isinmode,0 ; in an XGA mode? jne xgamode cmp colors,16 ; 16 colors? je vgamode ; just like a VGA jmp dullnormalmode ; otherwise, use the BIOS xgamode: mov ax,offset xga_16write ; set up XGA write-a-dot routine mov bx,offset xga_16read ; set up XGA read-a-dot routine mov cx,offset xga_16linewrite ; set up the XGA linewrite routine mov dx,offset normalineread ; set up the XGA lineread routine mov si,offset swap256 ; set up the swap routine jmp videomode ; return to common code VGAauto256mode: jmp super256mode ; just like a SuperVGA egamode: vgamode: ;;; shr vxdots,1 ; scan line increment is in bytes... ;;; shr vxdots,1 ;;; shr vxdots,1 mov ax,offset vgawrite ; set up EGA/VGA write-a-dot routine. mov bx,offset vgaread ; set up EGA/VGA read-a-dot routine mov cx,offset vgaline ; set up the EGA/VGA linewrite routine mov dx,offset vgareadline ; set up the EGA/VGA lineread routine mov si,offset swapvga ; set up the EGA/VGA swap routine jmp videomode ; return to common code tseng256mode: mov tseng,1 ; set chipset flag mov [bankadr],offset $tseng mov [bankseg],seg $tseng jmp super256mode ; set super VGA linear memory functions paradise256mode: mov paradise,1 ; set chipset flag mov [bankadr],offset $paradise mov [bankseg],seg $paradise jmp super256mode ; set super VGA linear memory functions video7256mode: mov video7, 1 ; set chipset flag mov [bankadr],offset $video7 mov [bankseg],seg $video7 jmp super256mode ; set super VGA linear memory functions trident256mode: mov trident,1 ; set chipset flag mov [bankadr],offset $trident mov [bankseg],seg $trident jmp super256mode ; set super VGA linear memory functions chipstech256mode: mov chipstech,1 ; set chipset flag mov [bankadr],offset $chipstech mov [bankseg],seg $chipstech jmp super256mode ; set super VGA linear memory functions ati256mode: mov ativga,1 ; set chipset flag mov [bankadr],offset $ativga mov [bankseg],seg $ativga jmp super256mode ; set super VGA linear memory functions everex256mode: mov everex,1 ; set chipset flag mov [bankadr],offset $everex mov [bankseg],seg $everex jmp super256mode ; set super VGA linear memory functions VGA256automode: ; Auto-detect SuperVGA jmp super256mode ; set super VGA linear memory functions VESA256mode: ; set VESA 256-color mode mov ax,word ptr vesa_mapper mov [bankadr],ax mov ax,word ptr vesa_mapper+2 mov [bankseg],ax jmp super256mode ; set super VGA linear memory functions super256mode: mov ax,offset super256write ; set up superVGA write-a-dot routine mov bx,offset super256read ; set up superVGA read-a-dot routine mov cx,offset super256line ; set up the linewrite routine mov dx,offset super256readline ; set up the normal lineread routine mov si,offset swap256 ; set up the swap routine jmp videomode ; return to common code tweak256mode: shr vxdots,1 ; scan line increment is in bytes... shr vxdots,1 mov oktoprint,0 ; NOT OK to printf() in this mode mov ax,offset tweak256write ; set up tweaked-256 write-a-dot mov bx,offset tweak256read ; set up tweaked-256 read-a-dot mov cx,offset tweak256line ; set up tweaked-256 read-a-line mov dx,offset tweak256readline ; set up the normal lineread routine mov si,offset swapvga ; set up the swap routine jmp videomode ; return to common code cgamode: mov cx,offset normaline ; set up the normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si,offset swapnormread ; set up the normal swap routine cmp videoax,4 ; check for 320x200x4 color mode je cga4med ; .. cmp videoax,5 ; .. je cga4med ; .. cmp videoax,6 ; check for 640x200x2 color mode je cga2high ; .. cga4med: mov ax,offset plotcga4 ; set up CGA write-a-dot mov bx,offset getcga4 ; set up CGA read-a-dot jmp videomode ; return to common code cga2high: mov ax,offset plotcga2 ; set up CGA write-a-dot mov bx,offset getcga2 ; set up CGA read-a-dot jmp videomode ; return to common code ati1024mode: mov ativga,1 ; set ATI flag. mov ax,offset ati1024write ; set up ATI1024 write-a-dot mov bx,offset ati1024read ; set up ATI1024 read-a-dot mov cx,offset normaline ; set up the normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si,offset swap256 ; set up the swap routine jmp videomode ; return to common code diskmode: call far ptr startdisk ; external disk-video start routine mov ax,offset diskwrite ; set up disk-vid write-a-dot routine mov bx,offset diskread ; set up disk-vid read-a-dot routine mov cx,offset normaline ; set up the normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si,offset swapnormread ; set up the normal swap routine jmp videomode ; return to common code yourownmode: call far ptr startvideo ; external your-own start routine mov ax,offset videowrite ; set up ur-own-vid write-a-dot routine mov bx,offset videoread ; set up ur-own-vid read-a-dot routine mov cx,offset normaline ; set up the normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si,offset swapnormread ; set up the normal swap routine mov videoflag,1 ; flag "your-own-end" needed. jmp videomode ; return to common code targaMode: ; TARGA MODIFIED 2 June 89 - j mclain call far ptr StartTGA mov ax,offset tgawrite ; mov bx,offset tgaread ; mov cx,offset normaline ; set up the normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si,offset swapnormread ; set up the normal swap routine mov tgaflag,1 ; jmp videomode ; return to common code f8514mode: ; 8514 modes call open8514 ; start the 8514a jnc f85ok mov goodmode,0 ; oops - problems. mov dotmode, 0 ; if problem starting use normal mode jmp dullnormalmode hgcmode: mov oktoprint,0 ; NOT OK to printf() in this mode call hgcstart ; Initialize the HGC card mov ax,offset hgcwrite ; set up HGC write-a-dot routine mov bx,offset hgcread ; set up HGC read-a-dot routine mov cx,offset normaline ; set up normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si,offset swapnormread ; set up the normal swap routine mov HGCflag,1 ; flag "HGC-end" needed. jmp videomode ; return to common code f85ok: mov ax,offset f85write ; mov bx,offset f85read ; mov cx,offset f85line ; mov dx,offset f85readline ; mov si,offset swapnormread ; set up the normal swap routine mov f85flag,1 ; mov oktoprint,0 ; NOT OK to printf() in this mode jmp videomode ; return to common code TrueColorAuto: cmp TPlusInstalled, 1 jne NoTPlus push NonInterlaced push PixelZoom push MaxColorRes push ydots push xdots call far ptr MatchTPlusMode add sp, 10 or ax, ax jz NoTrueColorCard cmp ax, 1 ; Are we limited to 256 colors or less? jne SetTPlusRoutines ; All right! True color mode! mov cx, MaxColorRes ; Aw well, give'm what they want. shl ax, cl mov colors, ax SetTPlusRoutines: mov goodmode, 1 mov oktoprint, 1 mov ax, offset TPlusWrite mov bx, offset TPlusRead mov cx, offset normaline mov dx, offset normalineread mov si, offset swapnormread jmp videomode NoTPlus: NoTrueColorCard: mov goodmode, 0 jmp videomode videomode: mov dotwrite,ax ; save the results mov dotread,bx ; ... mov linewrite,cx ; ... mov lineread,dx ; ... mov word ptr swapsetup,si ; ... mov ax,cs ; ... mov word ptr swapsetup+2,ax ; ... mov ax,colors ; calculate the "and" value dec ax ; to use for eventual color mov andcolor,ax ; selection mov boxcount,0 ; clear the zoom-box counter mov daclearn,0 ; set the DAC rotates to learn mode mov daccount,6 ; initialize the DAC counter cmp cpu,88 ; say, are we on a 186/286/386? jbe setvideoslow ; boo! hiss! mov daclearn,1 ; yup. bypass learn mode mov ax,cyclelimit ; and go as fast as he wants mov daccount,ax ; ... setvideoslow: call far ptr loaddac ; load the video dac, if we can ret setvideomode endp set_vesa_mapping_func proc near mov cx, word ptr suffix+2 and cx,0707h cmp cx,0305h je use_vesa2 cmp cx,0503h je use_vesa2 test ch,01h jz use_vesa1 cmp word ptr suffix+6,32 ; None of the above -- 2 32K R/W? jne use_vesa1 ; if not, use original 1 64K R/W! mov word ptr vesa_mapper,offset $vesa3 mov ax,32 div byte ptr suffix+4 ; Get number of pages in 32K mov vesa_gran_offset,ax ; Save it for mapping function xor dx,dx mov al,1 test word ptr suffix+8, 00800h jz low_high_seq xchg ax,dx low_high_seq: mov vesa_low_window,dx ; Window number at A000-A7FF mov vesa_high_window,ax ; Window number at A800-AFFF jmp short vesamapselected use_vesa2: mov word ptr vesa_mapper,offset $vesa2 jmp short vesamapselected use_vesa1: mov word ptr vesa_mapper,offset $vesa1 vesamapselected: mov word ptr vesa_mapper+2,seg $vesa1 ret set_vesa_mapping_func endp setnullvideo proc mov ax,offset nullwrite ; set up null write-a-dot routine mov dotwrite,ax ; ... mov ax,offset nullread ; set up null read-a-dot routine mov dotread,ax ; ... ret setnullvideo endp setvideo proc near ; local set-video more cmp xga_isinmode,0 ; XGA in graphics mode? je noxga ; nope push ax push bx push cx push dx mov ax,0 ; pull it out of graphics mode push ax mov xga_clearvideo,al call far ptr xga_mode pop ax pop dx pop cx pop bx pop ax noxga: push bp ; save it around all the int 10s mov text_type,2 ; set to this for most exit paths mov si,offset $vesa_nullbank ; set to do nothing if mode not vesa mov word ptr vesa_bankswitch,si mov si,seg $vesa_nullbank mov word ptr vesa_bankswitch+2,si mov word ptr vesa_mapper,offset $nobank mov word ptr vesa_mapper+2,seg $nobank mov tweakflag,0 cmp ax,0 ; TWEAK?: look for AX==BX==CX==0 jne short setvideobios ; ... cmp bx,0 ; ... jne short setvideobios ; ... cmp cx,0 ; ... jne short setvideobios ; ... cmp dotmode, 27 ; check for auto-detect modes je setvideoauto1 cmp dotmode, 20 ; check for auto-detect modes je setvideoauto1 cmp dotmode, 4 ; check for auto-detect modes je setvideoauto1 cmp dotmode, 28 ; check for auto-detect modes je setvideoauto1 jmp setvideoregs ; anything else - assume register tweak setvideoauto1: jmp setvideoauto ; stupid short 'je' instruction!! setvideobios: mov text_type,0 ; if next branch taken this is true cmp ax,3 ; text mode? jne setvideobios2 ; nope mov textaddr,0b800h cmp mode7text,0 ; egamono/hgc? je setvideobios_doit ; nope. Just do it. mov textaddr,0b000h mov ax,7 ; use mode 7 call maybeor ; maybe or AL or (for Video-7s) BL push bp ; weird but necessary, set mode twice int 10h ; get colors right on vga systems pop bp ; .. mov ax,7 ; for the 2nd hit jmp short setvideobios_doit setvideobios2: mov text_type,1 ; if next branch taken this is true cmp ax,6 ; 640x200x2 mode? je setvideobios_doit ; yup. Just do it. mov text_type,2 ; not mode 3 nor 6, so this is true mov si,dotmode ; compare the dotmode against mov di,video_type ; the video type add si,si ; (convert to a word pointer) cmp cs:video_requirements[si],di jbe setvideobios_doit ; ok jmp setvideoerror ; Error. setvideobios_doit: cmp dotmode,14 ; check for Tandy 1000 mode jne setvideobios_doit2 ; .. cmp ax,0ah ; check for Tandy 640x200x4 color mode jne setvideobios_doit1 ; .. push bp ; setup Tandy 640x200x4 color mode int 10h ; .. pop bp ; .. mov di,16 ;port offset for palette registers mov bx,0b01h ; remap colors for better display on call settandypal ; .. Tandy 640x200x4 color mode mov di,16 ;port offset for palette registers mov bx,0d02h ; .. call settandypal ; .. mov di,16 ;port offset for palette registers mov bx,0f03h ; .. call settandypal ; .. jmp setvideobios_worked setvideobios_doit1: cmp ax,0bh ; check for Tandy 640x200x16 color mode jne setvideobios_doit2 ; .. call tandysetup ; setup Tandy 640x200x16 color mode jmp setvideobios_worked setvideobios_doit2: call maybeor ; maybe or AL or (for Video-7s) BL push bp ; some BIOS's don't save this int 10h ; do it via the BIOS. pop bp ; restore the saved register cmp dotmode,28 ; VESA mode? jne setvideobios_worked ; Nope. Return. cmp ah,0 ; did it work? jne setvideoerror ; Nope. Failed. mov vesa_granularity,1 ; say use 64K granules push es ; set ES == DS mov ax,ds ; ... mov es,ax ; ... mov ax,4f01h ; ask about this video mode mov cx,bx ; this mode and cx,07fffh ; (oops - correct for the high-bit) mov di, offset suffix ; (a safe spot for 256 bytes) int 10h ; do it cmp ax,004fh ; did the call work? jne nogoodvesamode ; nope mov cx, word ptr suffix ; get the attributes test cx,1 ; available video mode? jz nogoodvesamode ; nope. skip some code call set_vesa_mapping_func mov cx, word ptr suffix+12 ; get the Bank-switching routine mov word ptr vesa_bankswitch, cx ; ... mov cx, word ptr suffix+14 ; ... mov word ptr vesa_bankswitch+2, cx ; ... mov cx, word ptr suffix+16 ; get the bytes / scan line cmp cx,0 ; is this entry filled in? je skipvesafix ; nope ;;; cmp colors,256 ; 256-color mode? ;;; jne skipvesafix ; nope cmp byte ptr suffix+24,1 jbe store_vesa_bytes shl cx,1 ; if a planar mode, bits are pixels shl cx,1 ; so we multiply bytes by 8 shl cx,1 store_vesa_bytes: mov vxdots,cx ; adjust the screen width accordingly XXX cmp cx,sxdots je skipvesafix mov ax,offset swapnormread ; use the slow swap routine mov word ptr swapsetup,ax ; ... skipvesafix: mov cx, word ptr suffix+4 ; get the granularity cmp cl,1 ; ensure the divide won't blow out jb nogoodvesamode ; granularity == 0??? mov ax,64 ; ... div cl ; divide 64K by granularity mov vesa_granularity,al ; multiply the bank number by this nogoodvesamode: pop es ; restore ES mov ax,4f02h ; restore the original call setvideobios_worked: jmp setvideoreturn ; Return. setvideoerror: ; oops. No match found. mov goodmode,0 ; note that the video mode is bad mov ax,3 ; switch to text mode jmp setvideobios_doit setvideoauto: mov si, video_entries ; look for the correct resolution sub si,8 ; get a running start setvideoloop: add si,10 ; get next entry mov ax,cs:0[si] ; check X-res cmp ax,0 ; anything there? je setvideoerror ; nope. No match cmp ax,sxdots jne setvideoloop mov ax,cs:2[si] ; check Y-res cmp ax,sydots jne setvideoloop mov ax,cs:4[si] ; check Colors cmp ax,colors jne setvideoloop mov ax,cs:6[si] ; got one! Load AX mov bx,cs:8[si] ; Load BX cmp ax,0ffffh ; XGA special? jne notxgamode mov al,orvideo mov xga_clearvideo,al cmp al,0 ; clearing the video? jne xgask1 ; yup mov ax,03h ; switch to text mode (briefly) int 10h xgask1: push bx call far ptr xga_mode pop bx cmp ax,0 je setvideoloop jmp setvideoreturn notxgamode: cmp bx,0ffh ; ATI 1024x768x16 special? jne notatimode mov dotmode,20 ; Convert to ATI specs mov al,65h mov bx,0 jmp setvideobios notatimode: cmp bx,0feh ; Tseng 640x400x256 special? jne nottsengmode mov ax,0 ; convert to Tseng specs mov bx,0 mov cx,0 mov dx,10 mov dotmode,4 jmp setvideoregs nottsengmode: cmp bx,0fdh ; Compaq 640x480x256 special? jne notcompaqmode mov vxdots,1024 ; (compaq uses 1024-byte scanlines) mov bx,offset swapnormread ; use the slow swap routine mov word ptr swapsetup,bx ; ... mov bx,0 jmp setvideobios notcompaqmode: cmp ax,4f02h ; VESA mode? jne notvesamode mov dotmode,28 ; convert to VESA specs notvesamode: jmp setvideobios setvideoregs: ; assume genuine VGA and program regs mov si, dotmode ; compare the dotmode against mov di,video_type ; the video type add si,si ; (convert to a word pointer) cmp cs:video_requirements[si],di jbe setvideoregs_doit ; good value. Do it. jmp setvideoerror ; bad value. Error. setvideoregs_doit: mov si,dx ; get the video table offset shl si,1 ; ... mov si,word ptr tweaks[si] ; ... mov tweaktype, dx ; save tweaktype cmp dx,8 ; 360x480 tweak256mode? je isatweaktype ; yup cmp dx,9 ; 320x400 tweak256mode? je isatweaktype ; yup cmp dx,18 ; 320x480 tweak256mode? je isatweaktype ; yup cmp dx,19 ; 320x240 tweak256mode? je isatweaktype ; yup cmp dx,10 ; Tseng tweak? je tsengtweak ; yup ;Patch - Michael D. Burkey (5/22/90) cmp dx,14 ; ATI Mode Support je ATItweak cmp dx,15 je ATItweak cmp dx,16 je ATItweak cmp dx,17 je ATItweak2 ; ATI 832x616 mode cmp dx,11 ; tweak256mode? (11 & up) jae isatweaktype ; yup ;End Patch jmp not256 ; nope none of the above tsengtweak: mov ax,46 ; start with S-VGA mode 2eh call maybeor ; maybe don't clear the video memory int 10h ; let the bios clear the video memory mov dx,3c2h ; misc output mov al,063h ; dot clock out dx,al ; select it mov dx,3c4h ; sequencer again mov ax,0300h ; restart sequencer out dx,ax ; running again jmp is256; ATItweak: mov ax,62h ;; pb, why no maybeor call here? int 10h mov dx,3c2h mov al,0e3h out dx,al mov dx,3c4h mov ax,0300h out dx,ax jmp is256 ATItweak2: mov ax,63h ;; pb, why no maybeor call here? int 10h mov dx,3c4h mov ax,0300h out dx,ax jmp is256 isatweaktype: mov tweakflag,1 mov ax,0013h ; invoke video mode 13h call maybeor ; maybe or AL or (for Video-7s) BL int 10h ; do it mov dx,3c4h ; alter sequencer registers mov ax,0604h ; disable chain 4 out dx,ax cmp orvideo,0 ; are we supposed to clear RAM? jne noclear256 ; (nope) mov dx,03c4h ; alter sequencer registers mov ax,0f02h ; enable writes to all planes OUT_WORD push es ; save ES for a tad mov ax,VGA_SEGMENT ; clear out all 256K of mov es,ax ; video memory sub di,di ; (64K at a time, but with mov ax,di ; all planes enabled) mov cx,8000h ;# of words in 64K cld rep stosw ;clear all of display memory pop es ; restore ES noclear256: mov dx,3c4h ; alter sequencer registers mov ax,0604h ; disable chain 4 out dx,ax jmp short is256 ; forget the ROM characters not256: mov ax,0012h ; invoke video mode 12h call maybeor ; maybe or AL or (for Video-7s) BL int 10h ; do it. is256: push es ; save ES for a tad mov ax,40h ; Video BIOS DATA area mov es,ax ; ... mov dx,word ptr es:[63h] ; say, where's the 6845? add dx,6 ; locate the status register vrdly1: in al,dx ; loop until vertical retrace is off test al,8 ; ... jnz vrdly1 ; ... vrdly2: in al,dx ; now loop until it's on! test al,8 ; ... jz vrdly2 ; ... cli ; turn off all interrupts mov dx,tweaktype cmp dx,9 ; 320x400 mode? je not256mode ; yup - skip this stuff cmp dx,10 ; Tseng tweak mode? je not256mode ; yup - skip this stuff ;patch #2 (M. Burkey 5/22/90) cmp dx,17 ; for 832x616 ATI Mode je not256mode ;patch end mov cl,0E7h ; value for misc output reg cmp dx,18 ; 320x480 mode? je setmisc320 ; nope, use above value cmp dx,19 ; 320x240 mode? jne setmiscoreg ; nope, use above value setmisc320: mov cl,0E3h ; value for misc output reg setmiscoreg: mov dx,03c4h ; Sequencer Synchronous reset mov ax,0100h ; set sequencer reset out dx,ax mov dx,03c2h ; Update Misc Output Reg mov al,cl out dx,al mov dx,03c4h ; Sequencer Synchronous reset mov ax,0300h ; clear sequencer reset out dx,ax not256mode: mov dx,word ptr es:[63h] ; say, where's the 6845? add si,2 ; point SI to the CRTC registers table mov al,11h ; deprotect registers 0-7 mov ah,byte ptr [si+11h] and ah,7fh out dx,ax mov cx,18h ; update this many registers mov bx,00 ; starting with this one. crtcloop: mov al,bl ; update this register mov ah,byte ptr [bx+si] ; to this out dx,ax inc bx ; ready for the next register loop crtcloop ; (if there is a next register) sti ; restore interrupts pop es ; restore ES setvideoreturn: mov curbk,0ffffh ; stuff impossible value into cur-bank mov orvideo,0 ; reset the video to clobber memory pop bp ret setvideo endp maybeor proc near ; or AL or BL for mon-destr switch cmp ah,4fh ; VESA special mode? je maybeor2 ; yup. Do this one different cmp ah,6fh ; video-7 special mode? je maybeor1 ; yup. do this one different or al,orvideo ; normal non-destructive switch jmp short maybeor99 ; we done. maybeor1: or bl,orvideo ; video-7 switch jmp short maybeor99 maybeor2: or bh,orvideo ; VESA switch maybeor99: ret ; we done. maybeor endp ; ********* Functions setfortext() and setforgraphics() ************ ; setfortext() resets the video for text mode and saves graphics data ; setforgraphics() restores the graphics mode and data ; setclear() clears the screen after setfortext() monocolors db 0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 setfortext proc uses es si di push bp ; save it around the int 10s cmp dotmode, 12 ;check for 8514 jne tnot8514 cmp f85flag, 0 ;check 8514 active flag je go_dosettext call close8514 ;close adapter if not mov f85flag, 0 go_dosettext: jmp dosettext ; safe to go to mode 3 tnot8514: cmp dotmode,9 ; Targa? je go_dosettext ; yup, leave it open & go to text cmp xga_isinmode,0 ; XGA in graphics mode? je noxga ; nope mov ax,xga_isinmode ; remember if we were in XGA mode mov xga_clearvideo,80h ; don't clear the video! mov ax,0 ; switch to VGA (graphics) mode push ax call far ptr xga_mode pop ax ; proceed on like nothing happened mov xga_clearvideo,0 ; reset the clear-video flag noxga: cmp dotmode,14 ; (klooge for Tandy 640x200x16) je setfortextcga cmp videoax,0 ; check for CGA modes je go_setfortextnocga ; not this one cmp dotmode,10 ; Hercules? je setfortextcga ; yup cmp videoax,7 ; <= vid mode 7? jbe setfortextcga ; yup go_setfortextnocga: jmp setfortextnocga ; not this one setfortextcga: ; from mode ensures we can go to mode 3, so do it mov ax,extraseg ; set ES == Extra Segment add ax,1000h ; (plus 64K) mov es,ax ; ... mov di,4000h ; save the video data here mov ax,0b800h ; video data starts here <XXX> mov si,0 ; ... cmp videoax,3 ; from mode 3? jne setfortextcga2 ; nope cmp mode7text,0 ; egamono/hgc? je setfortextcga2 ; nope mov ax,0b000h ; video data starts here setfortextcga2: mov cx,2000h ; save this many words cmp dotmode,10 ; Hercules? jne setfortextcganoherc ; nope mov di,0 ; (save 32K) mov ax,0b000h ; (from here) mov cx,4000h ; (save this many words) setfortextcganoherc: cmp dotmode,14 ; check for Tandy 1000 specific modes jne setfortextnotandy ; .. mov ax,tandyseg ; video data starts here mov si,tandyofs ; save video data here mov di,0 ; save the video data here mov cx,4000h ; save this many words setfortextnotandy: push ds ; save DS for a tad mov ds,ax ; reset DS cld ; clear the direction flag rep movsw ; save them. pop ds ; restore DS cmp dotmode,10 ; Hercules? jne dosettext ; nope cmp HGCflag, 0 ; check HGC active flag je dosettext call hgcend ; close adapter mov HGCflag, 0 dosettext: mov ax,3 ; set up the text call mov bx,0 ; ... mov cx,0 ; ... mov dx,0 ; ... call setvideo ; set the video jmp setfortextreturn setfortextnocga: mov bios_vidsave,0 ; default, not using bios for state save mov ax,textsafe2 ; videotable override? cmp ax,0 ; ... jne setfortextsafe ; yup mov ax,textsafe ; nope, use general setting setfortextsafe: cmp ax,2 ; textsafe=no? jne setforcolortext ; nope jmp setfordummytext ; yup, use 640x200x2 setforcolortext: ; must be ega, mcga, or vga, else we'd have set textsafe=no in runup cmp ax,4 ; textsafe=save? jne setforcolortext2 ; nope mov ax,0 ; disable the video (I think) call disablevideo ; ... call far ptr savegraphics ; C rtn which uses swapsetup call swapvga_reset ; some cleanup for swapvga case mov orvideo,80h ; preserve memory, just for speed cmp videoax,0fh ; ega 640x350x2? jne dosettext ; nope, go call bios for mode 3 mov ax,83h ; I know this is silly! have to set int 10h ; mode twice when coming from mode 0fh jmp dosettext ; on some machines to get right colors setforcolortext2: cmp ax,3 ; textsafe=bios? jne setforcolortext3 ; nope cmp video_type,5 ; vga? jl setforcolortext3 ; nope mov ax,1c00h ; check size of reqd save area mov cx,3 ; for hardware + bios states int 10h ; ask... cmp al,1ch ; function recognized? jne setforcolortext3 ; nope cmp bx,4 ; buffer big enough? (3 seems usual) ja setforcolortext3 ; nope mov bios_vidsave,1 ; using bios to save vid state mov ax,cs ; ptr to save buffer mov es,ax ; ... mov bx,offset bios_savebuf ; ... mov ax,1c01h ; save state mov cx,3 ; hardware + bios int 10h ; ... setforcolortext3: push ds ; save ds mov ax,extraseg ; set ES == Extra Segment add ax,1000h ; (plus 64K) mov es,ax ; ... cld mov ax,0a000h ; video mem address cmp video_type,4 ; mcga? jne setfortextegavga ; nope mov ds,ax ; set ds to video mem xor di,di ; from vid offset 0 xor si,si ; to save offset 0 mov cx,1000h ; save 4k words rep movsw ; font info mov si,8000h ; from vid offset 8000h mov cx,0800h ; save 2k words rep movsw ; characters and attributes pop ds ; restore ds mov orvideo,80h ; set the video to preserve memory jmp dosettext ; (else more than we saved gets cleared) setfortextegavga: sub ax,ax ; set bank just in case call far ptr newbank mov ax,8eh ; switch to a mode with known mapping cmp videoax,0fh ; coming from ega 640x350x2? jne sftknownmode ; nope mov ax,8fh ; yup, stay in it but do the set mode sftknownmode: int 10h ; set the safe mode mov ax,0 ; disable the video (I think) call disablevideo ; ... mov ax,0a000h ; video mem address mov ds,ax ; set ds to video mem xor di,di ; to offset 0 in save area ;; mov cx,0 ; set to plane 0 ;; call select_vga_plane ; ... ;; mov cx,0800h ; save 2k words ;; xor si,si ; from offset 0 in vid mem ;; rep movsw ; save plane 0 2k bytes (char values) mov cx,2 ; set to plane 2 call select_vga_plane ; ... mov cx,1000h ; save 4k words xor si,si ; from offset 0 in vid mem rep movsw ; save plane 2 8k bytes (font) ;; mov cx,1 ; set to plane 1 ;; call select_vga_plane ; ... ;; mov cx,0800h ; save 2k words ;; xor si,si ; from offset 0 in vid mem ;; rep movsw ; save plane 1 2k bytes (attributes) ;; push ds ; now zap attributes to zero to ;; pop es ; avoid flicker in the next stages ;; xor di,di ; ... ;; xor ax,ax ; ... ;; mov cx,0400h ; ... ;; rep stosw ; ... pop ds ; restore ds mov orvideo,80h ; set the video to preserve memory mov ax,3 ; set up the text call mov bx,0 ; ... mov cx,0 ; ... mov dx,0 ; ... call setvideo ; set the video push ds ; save ds mov ax,extraseg ; set ES == Extra Segment add ax,1000h ; (plus 64K) mov es,ax ; ... mov ax,textaddr mov ds,ax cld xor si,si mov di,2000h ; past the saved font info mov cx,0800h ; 2k words (text & attrs) rep movsw ; save them pop ds jmp setfortextreturn setfordummytext: ; use 640x200x2 simulated text mode mov ax,0 ; disable the video (I think) call disablevideo ; ... mov orvideo,80h ; set the video to preserve memory mov ax,6 ; set up the text call mov bx,0 ; ... mov cx,0 ; ... mov dx,0 ; ... call setvideo ; set the video mov ax,0 ; disable the video (I think) call disablevideo ; ... cld ; clear the direction flag mov ax,extraseg ; set ES == Extra Segment add ax,1000h ; (plus 64K) mov es,ax ; ... mov di,4000h ; save the video data here mov ax,0b800h ; video data starts here push ds ; save DS for a tad mov ds,ax ; reset DS mov si,0 ; ... mov cx,4000 ; save this many words rep movsw ; save them. mov si,2000h ; ... mov cx,4000 ; save this many words rep movsw ; save them. pop ds ; restore DS mov ax,0b800h ; clear the video buffer mov es,ax ; ... mov di,0 ; ... mov ax,0 ; to blanks mov cx,4000 ; this many blanks rep stosw ; do it. mov di,2000h ; ... mov cx,4000 ; this many blanks rep stosw ; do it. mov ax,20h ; enable the video (I think) call disablevideo ; ... mov bx,23 ; set mode 6 fgrd to grey mov cx,2a2ah ; register 23, rgb white mov dh,2ah ; ... mov ax,1010h ; int 10 10-10 affects mcga,vga int 10h ; ... mov ax,cs ; do it again, another way mov es,ax ; ... mov dx,offset monocolors ; ... mov ax,1002h ; int 10 10-02 handles pcjr,ega,vga int 10h ; ... setfortextreturn: call far ptr setclear ; clear and home the cursor pop bp ret setfortext endp setforgraphics proc uses es si di push bp ; save it around the int 10s cmp dotmode, 12 ;check for 8514 jne gnot8514 cmp f85flag, 0 jne go_graphicsreturn call reopen8514 mov f85flag, 1 go_graphicsreturn: jmp setforgraphicsreturn gnot8514: cmp dotmode,9 ; Targa? jne gnottarga ; nope call far ptr ReopenTGA jmp short go_graphicsreturn gnottarga: cmp dotmode,14 ; check for Tandy 1000 specific modes je setforgraphicscga ; yup cmp videoax,0 ; check for CGA modes je setforgraphicsnocga_x ; not this one cmp dotmode,10 ; Hercules? je setforgraphicscga ; yup cmp videoax,7 ; vid mode <=7? jbe setforgraphicscga ; CGA mode setforgraphicsnocga_x: jmp setforgraphicsnocga setforgraphicscga: cmp dotmode,10 ; Hercules? jne tnotHGC2 ; (nope. dull-normal stuff) call hgcstart ; Initialize the HGC card mov HGCflag,1 ; flag "HGC-end" needed. jmp short twasHGC2 ; bypass the normal setvideo call tnotHGC2: cmp dotmode,14 ; Tandy? jne tnottandy1 ; nope mov orvideo,80h ; set the video to preserve memory tnottandy1: mov ax,videoax ; set up the video call mov bx,videobx ; ... mov cx,videocx ; ... mov dx,videodx ; ... call setvideo ; do it. twasHGC2: mov bx,extraseg ; restore is from Extraseg add bx,1000h ; (plus 64K) mov si,4000h ; video data is saved here mov ax,0b800h ; restore the video area mov di,0 ; ... cmp videoax,3 ; from mode 3? jne setforgraphicscga2 ; nope cmp mode7text,0 ; egamono/hgc? je setforgraphicscga2 ; nope mov ax,0b000h ; video data starts here setforgraphicscga2: mov cx,2000h ; restore this many words cmp dotmode,10 ; Hercules? jne setforgraphicscganoherc ; nope mov si,0 ; (restore 32K) mov ax,0b000h ; (to here) mov cx,4000h ; (restore this many words) setforgraphicscganoherc: cmp dotmode,14 ; check for Tandy 1000 specific modes jne tnottandy2 ; .. mov ax,tandyseg ; video data starts here mov di,tandyofs ; save video data here mov si,0 ; video data is saved here mov cx,4000h ; save this many words tnottandy2: push ds ; save DX for a tad mov es,ax ; load the dest seg into ES mov ds,bx ; restore it from the source seg cld ; clear the direction flag rep movsw ; restore them. pop ds ; restore DS jmp setforgraphicsreturn setforgraphicsnocga: mov ax,0 ; disable the video (I think) call disablevideo ; ... cld ; clear the direction flag mov ax,textsafe2 ; videotable override? cmp ax,0 ; ... jne setforgraphicssafe ; yup mov ax,textsafe ; nope, use general setting setforgraphicssafe: cmp ax,2 ; textsafe=no? jne setforgraphicsnocga2 jmp setfordummygraphics ; yup, 640x200x2 setforgraphicsnocga2: ; must be ega, mcga, or vga, else we'd have set textsafe=no in runup cmp ax,4 ; textsafe=save? jne setforgraphicsnocga3 ; nope ;; pb, always clear video here: ;; need if for ega/vga with < 16 colors to clear unused planes ;; and, some bios's don't implement ah or'd with 80h?!?, dodge their bugs ;; cmp dotmode,2 ; ega/vga, <=16 colors? ;; jne setfgncfast ; nope ;; cmp colors,16 ; < 16 colors? ;; jae setfgncfast ; nope ;; jmp short setfgncsetvid ; special, need unused planes clear ;;setfgncfast: ;; mov orvideo,80h ; preserve memory (just to be fast) ;;setfgncsetvid: mov ax,videoax ; set up the video call mov bx,videobx ; ... mov cx,videocx ; ... mov dx,videodx ; ... call setvideo ; do it. sub ax,ax ; disable the video (I think) call disablevideo ; ... call far ptr restoregraphics ; C rtn which uses swapsetup call swapvga_reset ; some cleanup for swapvga case mov ax,20h ; enable the video (I think) call disablevideo ; ... jmp setforgraphicsreturn setforgraphicsnocga3: push ds ; save ds mov ax,0a000h ; set es to video mem mov es,ax ; ... cmp video_type,4 ; mcga? jne setforgraphicsegavga ; nope mov ax,extraseg ; set DS == Extra Segment add ax,1000h ; (plus 64K) mov ds,ax ; ... xor si,si ; from save offset 0 xor di,di ; to vid offset 0 mov cx,1000h ; restore 4k words rep movsw ; font info mov di,8000h ; to vid offset 8000h mov cx,0800h ; restore 2k words rep movsw ; characters and attributes jmp short setforgraphicsdoit setforgraphicsegavga: ;; mov cx,0 ; set to plane 0 ;; call select_vga_plane ; ... ;; mov ax,extraseg ; set DS == Extra Segment ;; add ax,1000h ; (plus 64K) ;; mov ds,ax ; ... ;; mov cx,0800h ; restore 2k words ;; xor si,si ; from offset 0 in save area ;; xor di,di ; to offset 0 in vid mem ;; rep movsw ; restore plane 0 2k bytes (char values) mov ax,textaddr mov es,ax mov ax,extraseg ; set DS == Extra Segment add ax,1000h ; (plus 64K) mov ds,ax ; ... cld xor di,di mov si,2000h ; past the saved font info mov cx,0800h ; 2k words (text & attrs) rep movsw ; restore them pop ds mov ax,8eh ; switch to a mode with known mapping cmp videoax,0fh ; returning to ega 640x350x2? jne sfgnotega ; nope mov ax,8fh ; yup, go directly to it sfgnotega: int 10h ; set the safe mode mov ax,0 ; disable the video (I think) call disablevideo ; ... mov cx,2 ; set to plane 2 call select_vga_plane ; ... push ds mov ax,0a000h ; set es to video mem mov es,ax ; ... mov ax,extraseg ; set DS == Extra Segment add ax,1000h ; (plus 64K) mov ds,ax ; ... mov cx,1000h ; restore 4k words xor di,di ; to offset 0 in vid mem xor si,si ; from offset 0 in extraseg rep movsw ; restore plane 2 8k bytes (font) ;; mov cx,1 ; set to plane 1 ;; call select_vga_plane ; ... ;; mov cx,0800h ; restore 2k words ;; xor di,di ; to offset 0 in vid mem ;; rep movsw ; restore plane 1 2k bytes (attributes) jmp short setforgraphicsdoit setfordummygraphics: push ds ; save ds mov ax,0b800h ; restore the video area mov es,ax ; ES == video addr mov di,0 ; ... mov ax,extraseg ; ... add ax,1000h ; (plus 64K) mov ds,ax ; ... mov si,4000h ; video data is saved here mov cx,4000 ; restore this many words rep movsw ; restore them. mov di,2000h mov cx,4000 ; restore this many words rep movsw ; restore them. setforgraphicsdoit: pop ds ; restore DS cmp bios_vidsave,0 ; did setfortext use bios state save? je setforgraphicssetvid ; nope mov ax,cs ; ptr to save buffer mov es,ax ; ... mov bx,offset bios_savebuf ; ... mov ax,1c02h ; restore state mov cx,3 ; hardware + bios int 10h ; ... jmp short setforgraphicsreturn setforgraphicssetvid: mov orvideo,80h ; set the video to preserve memory mov ax,videoax ; set up the video call mov bx,videobx ; ... mov cx,videocx ; ... mov dx,videodx ; ... call setvideo ; do it. mov ax,20h ; enable the video (I think) call disablevideo ; ... setforgraphicsreturn: mov curbk,0ffffh ; stuff impossible value into cur-bank mov ax,1 ; set up call to spindac(0,1) push ax ; ... mov ax,0 ; ... push ax ; ... call far ptr spindac ; do it. pop ax ; restore the registers pop ax ; ... pop bp ret setforgraphics endp ; swapxxx routines: indirect call via swapsetup, used by savegraphics ; and restoregraphics swap256 proc uses es si di ; simple linear banks version mov ax,word ptr swapoffset+2; high word of offset is bank call far ptr newbank ; map in the bank mov ax,0a000h ; high word of vid addr mov word ptr swapvidbuf+2,ax; store it mov ax,word ptr swapoffset ; offset in bank mov word ptr swapvidbuf,ax ; store as low word of vid addr neg ax ; 65536-offset jz swap256ret ; offset 0 cmp ax,swaplength ; rest of bank smaller than req length? jae swap256ret ; nope mov swaplength,ax ; yup, reduce length to what's available swap256ret: ret swap256 endp swapvga proc uses es si di ; 4 (or less) planes version xor si,si ; this will be plane number mov ax,word ptr swaptotlen ; dx,ax = total length mov dx,word ptr swaptotlen+2 mov cx,word ptr swapoffset ; bx,cx = offset mov bx,word ptr swapoffset+2 cmp colors,4 ; 4 or 2 color mode? jle swapvga_2 ; yup, no plane 2/3 shr dx,1 ; 1/2 of total rcr ax,1 ; ... cmp dx,bx ; 1/2 total <= offset? jb swapvga_1 ; yup ja swapvga_2 ; nope cmp ax,cx ; ... ja swapvga_2 ; nope swapvga_1: mov si,2 ; plane 2 sub cx,ax ; subtract 1/2 total from offset sbb bx,dx ; ... swapvga_2: cmp colors,2 ; 2 color mode? jle swapvga_4 ; yup, just plane 0 shr dx,1 ; 1/4 of total (or 1/2 if 4 colors) rcr ax,1 ; ... cmp dx,bx ; 1/4 total <= remaining offset? jb swapvga_3 ; yup ja swapvga_4 ; nope cmp ax,cx ; ... ja swapvga_4 ; nope swapvga_3: inc si ; plane 1 or 3 sub cx,ax ; subtract 1/4 total from offset sbb bx,dx ; ... swapvga_4: mov di,0 ; bank size (65536 actually) cmp bx,dx ; in last bank? jne swapvga_5 ; nope mov di,ax ; yup, note its size swapvga_5: mov ax,0a000h ; high word of vid addr mov word ptr swapvidbuf+2,ax; store it mov word ptr swapvidbuf,cx ; low word of vid addr (offset in bank) sub di,cx ; bank size - offset je swapvga_6 ; 0 implies bank = 65536 cmp di,swaplength ; rest of bank smaller than req length? jae swapvga_6 ; nope mov swaplength,di ; yup, reduce length to what's available swapvga_6: push si ; remember plane mov ax,bx ; top word of offset is bank call far ptr newbank ; map in the bank mov dx,03ceh ; graphics controller address pop cx ; plane mov ah,cl ; ... mov al,04h ; set up controller address register out dx,ax ; map the plane into memory for reads mov ax,0001h ; set/reset enable - all bits processor out dx,ax ; ... mov ax,0ff08h ; bit mask - all bits processor out dx,ax ; ... mov dx,03c4h ; sequencer address mov ah,1 ; 1 << plane number shl ah,cl ; ... mov al,02h ; sequencer plane write enable register out dx,ax ; enable just this plane for writing ret swapvga endp swapvga_reset proc near cmp word ptr swapsetup,offset swapvga; swapvga being used? jne swapvga_reset_ret mov ax,0f02h ; write enable register, all planes mov dx,03c4h ; sequencer address out dx,ax swapvga_reset_ret: ret swapvga_reset endp swapnormread proc uses es si di ; the SLOW version local xdot:word,ydot:word,bytesleft:word,bits:word,bitctr:word local savebyte:byte mov ax,swaplength ; bytes to save mov bytesleft,ax ; ... mov bits,8 ; bits/pixel mov bx,word ptr swapoffset ; pixel offset to save mov cx,word ptr swapoffset+2 mov ax,colors ; colors swapnorm_bits: cmp ax,256 ; accounted for 8 bits yet? jae swapnorm_gotbits ; yup shr bits,1 ; nope, halve the bits/pixel shl bx,1 ; double the pixel offset rcl cx,1 ; ... mul ax ; square colors accounted for jmp short swapnorm_bits ; check if enough yet swapnorm_gotbits: mov ax,bx ; pixel offset now in dx:ax mov dx,cx ; ... div sxdots ; translate pixel offset to row/col mov ydot,ax ; ... mov xdot,dx ; ... mov ax,extraseg ; Extra Segment add ax,1000h ; plus 64K mov word ptr swapvidbuf+2,ax; temp buffer to return to caller mov word ptr swapvidbuf,0 ; ... mov word ptr tmpbufptr+2,ax ; running ptr for building buffer mov word ptr tmpbufptr,0 ; ... mov bitctr,0 swapnorm_loop: mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; for dotread mov cx,xdot ; load up the registers mov dx,ydot ; for the video routine call dotread ; read the dot via the approved method mov cx,bits ; bits per pixel cmp cx,8 ; 1 byte per pixel? je swapnorm_store ; yup, go store a byte add bitctr,cx ; nope, add how many we're storing mov bl,savebyte ; load the byte being built swapnorm_shift: shr al,1 ; shift pixel into byte rcr bl,1 ; ... loop swapnorm_shift ; for number of bits/pixel mov savebyte,bl ; save byte we're building cmp bitctr,8 ; filled a byte yet? jb swapnorm_nxt ; nope mov al,bl ; yup, set up to store mov bitctr,0 ; clear counter for next time swapnorm_store: les di,tmpbufptr ; buffer pointer stosb ; store byte dec bytesleft ; finished? jz swapnorm_ret ; yup mov word ptr tmpbufptr,di ; store incremented buffer pointer swapnorm_nxt: inc xdot ; for next dotread call mov ax,xdot ; past row length? cmp ax,sxdots ; ... jb swapnorm_loop ; nope, go for next pixel inc ydot ; yup, increment row mov xdot,0 ; and reset column jmp short swapnorm_loop ; go for next pixel swapnorm_ret: ret swapnormread endp swapnormwrite proc uses es si di ; the SLOW way local xdot:word,ydot:word,bytesleft:word,bits:word,bitctr:word local savebyte:byte mov ax,swaplength ; bytes to restore inc ax ; +1 mov bytesleft,ax ; save it mov bits,8 ; bits/pixel mov bx,word ptr swapoffset ; pixel offset to restore mov cx,word ptr swapoffset+2; ... mov ax,colors ; colors swapnormw_bits: cmp ax,256 ; accounted for 8 bits yet? jae swapnormw_gotbits ; yup shr bits,1 ; nope, halve the bits/pixel shl bx,1 ; double the pixel offset rcl cx,1 ; ... mul ax ; square colors accounted for jmp short swapnormw_bits ; check if enough yet swapnormw_gotbits: mov ax,bx ; pixel offset now in dx:ax mov dx,cx ; ... div sxdots ; translate pixel offset to row/col mov ydot,ax ; ... mov xdot,dx ; ... mov dx,word ptr swapvidbuf+2; temp buffer from caller mov ax,word ptr swapvidbuf ; ... mov word ptr tmpbufptr+2,dx ; running ptr in buffer mov word ptr tmpbufptr,ax ; ... mov bitctr,0 swapnormw_loop: mov cx,bits ; bits per pixel sub bitctr,cx ; subtract a pixel from counter jg swapnormw_extract ; got some left in savebyte dec bytesleft ; all done? jz swapnormw_ret ; yup les si,tmpbufptr ; buffer pointer mov dl,es:[si] ; next byte inc word ptr tmpbufptr ; incr buffer pointer for next time mov bitctr,8 ; reset unused bit count cmp cx,8 ; 1 byte/pixel? je swapnormw_store ; yup, go the fast way mov bl,dl ; byte to extract from jmp short swapnormw_extract2 swapnormw_extract: mov bl,savebyte ; byte with bits left to use mov dl,bl ; current pixel in bottom n bits swapnormw_extract2: shr bl,1 ; for next time loop swapnormw_extract2 ; for bits per pixel mov savebyte,bl ; save remaining bits swapnormw_store: mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; for dotread mov al,dl ; color to write and ax,andcolor ; ... mov cx,xdot ; load up the registers mov dx,ydot ; for the video routine call dotwrite ; write the dot via the approved method inc xdot ; for next dotread call mov ax,xdot ; past row length? cmp ax,sxdots ; ... jb swapnormw_loop ; nope, go for next pixel inc ydot ; yup, increment row mov xdot,0 ; and reset column jmp short swapnormw_loop ; go for next pixel swapnormw_ret: ret swapnormwrite endp ; far move routine for savegraphics/restoregraphics movewords proc uses es di si, len:word, fromptr:dword, toptr:dword push ds ; save DS mov cx,len ; words to move les di,toptr ; destination buffer lds si,fromptr ; source buffer cld ; direction=forward rep movsw ; do it. pop ds ; restore DS ret ; we done. movewords endp ; clear text screen setclear proc uses es si di ; clear the screen after setfortext call far ptr home ; home the cursor mov ax,textaddr mov es,ax xor di,di cmp text_type,0 ; real text mode? jne setcbw ; nope mov ax,0720h ; blank with white attribute mov cx,2000 ; 80x25 rep stosw ; clear it jmp short setcdone setcbw: xor ax,ax ; graphics text mov cx,4000 ; 640x200x2 / 8 rep stosw ; clear it mov di,2000h ; second part mov cx,4000 rep stosw ; clear it setcdone: xor ax,ax ; zero mov textrbase,ax ; clear this mov textcbase,ax ; and this ret ; we done. setclear endp disablevideo proc near ; wierd video trick to disable/enable push dx ; save some registers push ax ; ... mov dx,03bah ; set attribute comtroller flip-flop in al,dx ; regardless of video mode mov dx,03dah ; ... in al,dx ; ... mov dx,03c0h ; attribute controller address pop ax ; 00h = disable, 20h = enable out dx,al ; trust me. pop dx ; restore DX and we done. ret disablevideo endp ;***************** Shadow Video Routines, MCP 6-7-91 *********** .DATA extrn AntiAliasing:WORD extrn Shadowing:WORD public ShadowColors ShadowRead dw ? ShadowWrite dw ? ShadowLineWrite dw ? ShadowLineRead dw ? ShadowSwap dd ? ShadowColors dw ? .CODE ; Passing this routine 0 turns off shadow, nonzero turns it on. ShadowVideo proc uses di si, state:WORD mov ax, state cmp ax, Shadowing jne SetShadowing jmp ExitShadowVideo SetShadowing: mov Shadowing, ax or ax, ax jz ShadowVideoOff mov cx, AntiAliasing shl xdots, cl shl ydots, cl shl sxdots, cl shl sydots, cl cmp ShadowColors, 0 jne NoTColors mov colors, 256 NoTColors: mov ax,offset diskwrite ; set up disk-vid write-a-dot routine mov bx,offset diskread ; set up disk-vid read-a-dot routine mov cx,offset normaline ; set up the normal linewrite routine mov dx,offset normalineread ; set up the normal lineread routine mov si, offset ShadowSwapFnct mov di, cs jmp SetShadowVideo ShadowVideoOff: mov cx, AntiAliasing shr xdots, cl shr ydots, cl shr sxdots, cl shr sydots, cl mov ax, ShadowColors mov colors, ax mov ax, ShadowWrite mov bx, ShadowRead mov cx, ShadowLineWrite mov dx, ShadowLineRead mov si, WORD PTR ShadowSwap mov di, WORD PTR ShadowSwap+2 SetShadowVideo: mov dotwrite,ax ; save the results mov dotread,bx ; ... mov linewrite,cx ; ... mov lineread,dx ; ... mov WORD PTR swapsetup, si mov WORD PTR swapsetup+2, di ExitShadowVideo: ret ShadowVideo ENDP SetupShadowVideo PROC mov ax, dotwrite ; save the results mov ShadowWrite, ax mov ax, dotread ; ... mov ShadowRead, ax mov ax, linewrite mov ShadowLineWrite, ax mov ax, lineread mov ShadowLineRead, ax mov ax, WORD PTR swapsetup mov WORD PTR ShadowSwap, ax mov ax, WORD PTR swapsetup+2 mov WORD PTR ShadowSwap+2, ax mov ax, colors mov ShadowColors, ax mov Shadowing, 0 mov ax, 1 push ax call ShadowVideo add sp, 2 call far ptr startdisk ret SetupShadowVideo ENDP ; This routine makes sure the right routines are set for swapping what's ; really on the screen. ShadowSwapFnct PROC xor ax, ax push ax call ShadowVideo add sp, 2 call [ShadowSwap] mov ax, 1 push ax call ShadowVideo add sp, 2 ret ShadowSwapFnct ENDP ; ************** Function findfont(n) ****************************** ; findfont(0) returns far pointer to 8x8 font table if it can ; find it, NULL otherwise; ; nonzero parameter reserved for future use findfont proc uses es si di, fontparm:word mov ax,01130h ; func 11, subfunc 30 mov bh,03h ; 8x8 font, bottom 128 chars sub cx,cx ; so we can tell if anything happens int 10h ; ask bios sub ax,ax ; default return, NULL sub dx,dx ; ... or cx,cx ; did he set cx? jz findfontret ; nope, return with NULL mov dx,es ; yup, return far pointer mov ax,bp ; ... findfontret: ret ; note that "uses" gets bp reset here findfont endp ; **************** Function home() ******************************** ; Home the cursor (called before printfs) home proc mov ax,0200h ; force the cursor mov bx,0 ; in page 0 mov dx,0 ; to the home position mov textrow,dx ; update our local values mov textcol,dx ; ... push bp ; some BIOS's don't save this int 10h ; do it. pop bp ; restore the saved register ret home endp ; **************** Function movecursor(row, col) ********************** ; Move the cursor (called before printfs) movecursor proc row:word, col:word mov ax,row ; row specified? cmp ax,-1 ; ... je mccol ; nope, inherit it mov textrow,ax ; yup, store it mccol: mov ax,col ; col specified? cmp ax,-1 ; ... je mcdoit ; nope, inherit it mov textcol,ax ; yup, store it mcdoit: mov ax,0200h ; force the cursor mov bx,0 ; in page 0 mov dh,byte ptr textrow ; move to this row add dh,byte ptr textrbase ; ... mov dl,byte ptr textcol ; move to this column add dl,byte ptr textcbase ; ... push bp ; some BIOS's don't save this int 10h ; do it. pop bp ; restore the saved register ret movecursor endp ; **************** Function keycursor(row, col) ********************** ; Subroutine to wait cx ticks, or till keystroke pending tickwait proc FRAME <es> ; std stack frame for TC++ overlays tickloop1: push cx ; save loop ctr sub ax,ax ; set ES to BIOS data area mov es,ax ; ... mov bx,es:046ch ; obtain the current timer value push bx call far ptr keypressed ; check if keystroke pending pop bx pop cx ; restore loop ctr cmp ax,0 ; keystroke? jne tickret ; yup, return tickloop2: cmp bx,es:046ch ; a new clock tick started yet? je tickloop2 ; nope loop tickloop1 ; wait another tick? xor ax,ax ; nope, exit no key, ticks done tickret: UNFRAME <es> ; pop stack frame ret tickwait endp ; Show cursor, wait for a key, disable cursor, return key keycursor proc uses es si di, row:word, col:word mov cursortyp,0607h ; default cursor mov ax,row ; row specified? cmp ax,-1 ; ... je ckcol ; nope, inherit it test ax,08000h ; top bit on? je ckrow ; nope and ax,07fffh ; yup, clear it mov cursortyp,0507h ; and use a bigger cursor ckrow: mov textrow,ax ; store row ckcol: mov ax,col ; col specified? cmp ax,-1 ; ... je ckmode ; nope, inherit it mov textcol,ax ; yup, store it ckmode: cmp text_type,1 ; are we in 640x200x2 mode? jne ck_text ; nope. do it the easy way ck_bwloop: ; 640x200x2 cursor loop mov cx,3 ; wait 3 ticks for keystroke call far ptr tickwait ; ... cmp ax,0 ; got a keystroke? je ckwait ; nope jmp ck_get ; yup, fetch it and return ckwait: mov ax,320 ; offset in vid mem of top row 1st byte: mov bx,textrow ; row add bx,textrbase ; ... mul bx ; row*320 + col add ax,textcol ; ... add ax,textcbase ; ... mov di,ax ; ... mov ax,0b800h ; set es to vid memory mov es,ax ; ... mov ah,byte ptr es:00f0h[di]; row 6 of character mov al,byte ptr es:20f0h[di]; row 7 of character push ax ; save them mov cx,8 ; count on bits in orig value xor bx,bx ; ... ckbits: shl al,1 ; ... adc bx,0 ; ... loop ckbits ; ... mov al,0 ; black cursor cmp bx,4 ; >= 4 on bits in orig value? jge ckbwgo ; yup, use black cursor not al ; nope, use white cursor ckbwgo: mov byte ptr es:20f0h[di],al; turn on cursor, row 7 cmp cursortyp,0607h ; small cursor? je ckbwwt ; yup mov byte ptr es:00f0h[di],al; nope, turn on cursor row 6 ckbwwt: mov cx,3 ; wait 3 ticks for keystroke call far ptr tickwait ; ... pop bx ; saved orig value mov byte ptr es:00f0h[di],bh; turn off cursor, row 6 mov byte ptr es:20f0h[di],bl; turn off cursor, row 7 cmp ax,0 ; got a keystroke? jne ck_get ; yup, fetch it and return jmp short ck_bwloop ; and keep waiting ck_text: cmp text_type,0 ; real text mode? jne ckgetw ; nope, no cursor at all push bp ; some bios's don't save this mov ah,1 ; set cursor type mov cx,cursortyp ; ... int 10h ; ... mov ah,02 ; move cursor xor bx,bx ; page mov dh,byte ptr textrow ; row add dh,byte ptr textrbase ; ... mov dl,byte ptr textcol ; col add dh,byte ptr textcbase ; ... int 10h ; ... pop bp ckgetw: call far ptr keypressed ; not getakey, help/tab mey be enabled cmp ax,0 ; key available? je ckgetw ; nope, keep waiting ck_get: call far ptr getakey ; get the keystroke cmp text_type,0 ; real text mode? jne ck_ret ; nope, done push bp ; some bios's don't save this push ax ; save it mov ah,1 ; make cursor normal size mov cx,0607h ; ... int 10h ; ... mov ah,02 ; move cursor xor bx,bx ; page mov dx,1950h ; off the display int 10h ; ... pop ax ; keystroke value pop bp ck_ret: ret keycursor endp ; ************* Function scrollup(toprow, botrow) ****************** ; Scroll the screen up (from toprow to botrow) scrollup proc uses es, toprow:word, botrow:word mov ax,0601h ; scropp up one line mov bx,0700h ; new line is black mov cx,toprow ; this row, mov ch,cl ; ... mov cl,0 ; first column mov dx,botrow ; to this row, mov dh,dl ; ... mov dl,79 ; last column push bp ; some BIOS's don't save this int 10h ; do it. pop bp ; restore the saved register ret ; we done. scrollup endp ; ************* Function scrolldown(toprow, botrow) ****************** ; Scroll the screen down (from toprow to botrow) scrolldown proc uses es, toprow:word, botrow:word mov ax,0701h ; scropp down one line mov bx,0700h ; new line is black mov cx,toprow ; this row, mov ch,cl ; ... mov cl,0 ; first column mov dx,botrow ; to this row, mov dh,dl ; ... mov dl,79 ; last column push bp ; some BIOS's don't save this int 10h ; do it. pop bp ; restore the saved register ret ; we done. scrolldown endp ; **************** Function getcolor(xdot, ydot) ******************* ; Return the color on the screen at the (xdot,ydot) point getcolor proc uses di si es, xdot:word, ydot:word mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; save it here during this routine mov cx,xdot ; load up the registers mov dx,ydot ; for the video routine add cx,sxoffs ; ... add dx,syoffs ; ... call dotread ; read the dot via the approved method mov ah,0 ; clear the high-order bits ret ; we done. getcolor endp ; Fastcall version, called when C programs are compiled by MSC 6.00A: @getcolor proc FORTRAN ; ax=xdot, dx=ydot push si ; preserve these push di ; ... mov cx,ax ; load up the registers add cx,sxoffs ; ... add dx,syoffs ; ... mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; ... call dotread ; read the dot via the approved method xor ah,ah ; clear the high-order bits pop di ; restore pop si ; ... ret ; we done. @getcolor endp ; ************** Function putcolor(xdot, ydot, color) ******************* ; write the color on the screen at the (xdot,ydot) point putcolor proc uses di si es, xdot:word, ydot:word, xcolor:word mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; save it here during this routine mov cx,xdot ; load up the registers mov dx,ydot ; for the video routine add cx,sxoffs ; ... add dx,syoffs ; ... mov ax,xcolor ; ... and ax,andcolor ; (ensure that 'color' is in the range) call dotwrite ; write the dot via the approved method ;;; call videocleanup ; perform any video cleanup required ret ; we done. putcolor endp ; Fastcall version, called when C programs are compiled by MSC 6.00A: @putcolor proc FORTRAN ; ax=xdot, dx=ydot, bx=color push si ; preserve these push di ; ... mov cx,ax ; load up the registers add cx,sxoffs ; ... add dx,syoffs ; ... mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; ... mov ax,bx ; color and ax,andcolor ; ensure that 'color' is in range call dotwrite ; write the dot via the approved method ;;; call videocleanup ; perform any video cleanup required pop di ; restore pop si ; ... ret ; we done. @putcolor endp ; ***************Function out_line(pixels,linelen) ********************* ; This routine is a 'line' analog of 'putcolor()', and sends an ; entire line of pixels to the screen (0 <= xdot < xdots) at a clip ; Called by the GIF decoder out_line proc uses di si es, pixels:ptr byte, linelen:word mov cx,sxoffs ; start at left side of logical screen mov dx,rowcount ; sanity check: don't proceed add dx,syoffs ; ... cmp dx,sydots ; beyond the end of the screen ja out_lineret ; ... mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; save it here during this routine mov ax, linelen ; last pixel column add ax, sxoffs ; ... dec ax ; ... mov si,pixels ; get the color for dot 'x' call linewrite ; mode-specific linewrite routine inc rowcount ; next row out_lineret: xor ax,ax ; return 0 ret out_line endp ; ***Function get_line(int row,int startcol,int stopcol, unsigned char *pixels) *** ; This routine is a 'line' analog of 'getcolor()', and gets a segment ; of a line from the screen and stores it in pixels[] at one byte per ; pixel ; Called by the GIF decoder get_line proc uses di si es, row:word, startcol:word, stopcol:word, pixels:ptr byte mov cx,startcol ; sanity check: don't proceed add cx,sxoffs ; ... cmp cx,sxdots ; beyond the right end of the screen ja get_lineret ; ... mov dx,row ; sanity check: don't proceed add dx,syoffs ; ... cmp dx,sydots ; beyond the bottom of the screen ja get_lineret ; ... mov ax, stopcol ; last pixel to read add ax, sxoffs ; ... mov di, pixels ; get the color for dot 'x' call lineread ; mode-specific lineread routine get_lineret: xor ax,ax ; return 0 ret get_line endp ; ***Function put_line(int row,int startcol,int stopcol, unsigned char *pixels) *** ; This routine is a 'line' analog of 'putcolor()', and puts a segment ; of a line from the screen and stores it in pixels[] at one byte per ; pixel ; Called by the GIF decoder put_line proc uses di si es, row:word, startcol:word, stopcol:word, pixels:ptr byte mov cx,startcol ; sanity check: don't proceed add cx,sxoffs ; ... cmp cx,sxdots ; beyond the right end of the screen ja put_lineret ; ... mov dx,row ; sanity check: don't proceed add dx,syoffs ; ... cmp dx,sydots ; beyond the bottom of the screen ja put_lineret ; ... mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; save it here during this routine mov ax, stopcol ; last column add ax, sxoffs; ; ... cmp ax,sxdots ; beyond the right end of the screen? ja put_lineret ; ... mov si,pixels ; put the color for dot 'x' call linewrite ; mode-specific linewrite routine put_lineret: xor ax,ax ; return 0 ret put_line endp ;----------------------------------------------------------------- ; setattr(row, col, attr, count) where ; row, col = row and column to start printing. ; attr = color attribute. ; count = number of characters to set ; This routine works only in real color text mode. setattr proc uses es di, row:word, col:word, attr:word, count:word mov ax,row ; row specified? cmp ax,-1 ; ... je setac ; nope, inherit it mov textrow,ax ; yup, store it setac: mov ax,col ; col specified? cmp ax,-1 ; ... je setago ; nope, inherit it mov textcol,ax ; yup, store it setago: cmp text_type,0 ; real color text mode? jne setax ; nope, do nothing mov ax,textrow ; starting row add ax,textrbase ; ... mov cx,160 ; x 2 bytes/row (char & attr bytes) imul cx mov bx,textcol ; add starting column add bx,textcbase ; ... add ax,bx ; twice since 2 bytes/char add ax,bx ; ... mov di,ax ; di -> start location in Video segment mov cx,count ; number of bytes to set jcxz setax ; none? mov ax,attr ; get color attributes in al mov dx,0b800h ; set video pointer cmp mode7text,0 ; egamono/hgc? je setalstore ; nope mov dx,0b000h ; mode 7 address mov al,07h ; normal mda ttribute cmp ah,0 ; inverse? jge setalchkbright ; nope mov al,70h ; yup jmp short setalstore setalchkbright: test ah,40h ; bright? jz setalstore ; nope mov al,0Fh ; yup setalstore: mov es,dx ; ... setalp: mov byte ptr es:1[di],al ; set attribute add di,2 ; for next one loop setalp ; do next char setax: ret setattr endp ;----------------------------------------------------------------- ; PUTSTR.asm puts a string directly to video display memory. Called from C by: ; putstring(row, col, attr, string) where ; row, col = row and column to start printing. ; attr = color attribute. ; string = far pointer to the null terminated string to print. ; Written for the A86 assembler (which has much less 'red tape' than MASM) ; by Bob Montgomery, Orlando, Fla. 7-11-88 ; Adapted for MASM 5.1 by Tim Wegner 12-11-89 ; Furthur mucked up to handle graphics ; video modes by Bert Tyler 1-07-90 ; Reworked for: row,col update/inherit; ; 620x200x2 inverse video; far ptr to string; ; fix to avoid scrolling when last posn chgd; ; divider removed; newline ctl chars; PB 9-25-90 putstring proc uses es di si, row:word, col:word, attr:word, string:far ptr byte mov ax,row ; row specified? cmp ax,-1 ; ... je putscol ; nope, inherit it mov textrow,ax ; yup, store it putscol: mov ax,col ; col specified? cmp ax,-1 ; ... je putsmode ; nope, inherit it mov textcol,ax ; yup, store it putsmode: les si,string ; load buffer pointer cmp text_type,0 ; are we in color text mode? jne short put_substring ; nope jmp put_text ; yup put_substring: ; graphics mode substring loop push si ; save start pointer push textcol ; save start column put_loop: mov al,byte ptr es:[si] ; get next char cmp al,0 ; end of string? je puts_chk_invert ; yup cmp al,10 ; end of line? je puts_chk_invert ; yup push si ; save offset push es ; save this push bp ; and this push ax ; and this last, needed soonest mov ah,02h ; set up bios set cursor call xor bh,bh ; page 0 mov dl,byte ptr textcol ; screen location add dl,byte ptr textcbase ; ... mov dh,byte ptr textrow ; ... add dh,byte ptr textrbase ; ... int 10h ; invoke the bios pop ax ; the character to write mov ah,09h ; set up the bios write char call mov bx,7 ; page zero, color mov cx,1 ; write 1 character int 10h ; invoke the bios pop bp ; restore pop es ; restore pop si ; restore inc si ; on to the next character inc textcol ; ... jmp short put_loop ; ... puts_chk_invert: pop bx ; starting column number pop dx ; restore start offset cmp attr,0 ; top bit of attribute on? jge short puts_endsubstr ; nope, nothing more to do cmp text_type,1 ; 640x200x2 mode? jne short puts_endsubstr ; nope, can't do anything more mov cx,si ; calc string length sub cx,dx ; ... jcxz short puts_endsubstr ; empty string? push ax ; remember terminating char push es ; and this ; make the string inverse video on display mov ax,320 ; offset in vid mem of 1st byte's top mov di,textrow ; row*320 + col add di,textrbase ; ... mul di ; ... add ax,bx ; ... add ax,textcbase ; ... mov di,ax ; ... mov ax,0b800h ; set es to vid memory mov es,ax ; ... puts_invert: not byte ptr es:0000h[di] ; invert the 8x8 making up a character not byte ptr es:2000h[di] not byte ptr es:0050h[di] not byte ptr es:2050h[di] not byte ptr es:00a0h[di] not byte ptr es:20a0h[di] not byte ptr es:00f0h[di] not byte ptr es:20f0h[di] inc di loop puts_invert ; on to the next character pop es ; restore pop ax ; ... puts_endsubstr: cmp al,0 ; the very end? je short putstring_ret ; we done. inc si ; go past the newline char mov textcol,0 ; do newline inc textrow ; ... jmp put_substring ; on to the next piece put_text: ; text mode substring loop mov ax,textrow ; starting row add ax,textrbase ; ... mov cx,160 ; x 2 bytes/row (char & attr bytes) imul cx mov bx,textcol ; add starting column add bx,textcbase ; ... add ax,bx ; twice since 2 bytes/char add ax,bx ; ... mov di,ax ; di -> start location in Video segment mov ax,attr ; get color attributes in ah cmp mode7text,0 ; egamono/hgc? (MDA) je B0 ; nope, use color attr mov al,07h ; default, white on blank cmp ah,0 ; top bit of attr set? jge mdachkbright ; nope mov al,70h ; inverse video jmp short B0 mdachkbright: test ah,40h ; 2nd bit of attr set? jz B0 ; nope mov al,0Fh ; bright B0: mov ah,al B1: mov al,byte ptr es:[si] ; get a char in al cmp al,0 ; end of string? je putstring_ret ; yes, done inc si ; bump for next time cmp al,10 ; newline? jne B2 ; nope mov textcol,0 ; yup, do it inc textrow ; ... jmp short put_text ; on to the next substring B2: push es ; No, store char & attribute mov dx,textaddr ; ... mov es,dx ; ... stosw ; ... pop es ; ... inc textcol ; update local var jmp short B1 ; do next char putstring_ret: ret putstring endp ; **************** EGA Palette <==> VGA DAC Conversion Routines ********** ; paltodac converts a 16-palette EGA value to a 256-color VGA ; value (duplicated 16 times) ; dactopal converts the first 16 VGA values to a 16-palette ; EGA value ; local routines called with register values ; BH = VGA Red Color xxRRRRRR ; BL = VGA Green Color xxGGGGGG ; CH = VGA Blue Color xxBBBBBB ; CL = EGA Palette xxrgbRGB ; ; palettetodac converts CL to BH/BL/CH ; dactopalette converte BH/BL/CH to CL ; ************************************************************************* palettetodac proc near mov bx,0 ; initialize RGB values to 0 mov ch,0 ; ... test cl,20h ; low-red high? jz palettetodac1 ; nope or bh,10h ; set it palettetodac1: test cl,10h ; low-green high? jz palettetodac2 ; nope or bl,10h ; set it palettetodac2: test cl,08h ; low-blue high? jz palettetodac3 ; nope or ch,10h ; set it palettetodac3: test cl,04h ; high-red high? jz palettetodac4 ; nope or bh,20h ; set it palettetodac4: test cl,02h ; high-green high? jz palettetodac5 ; nope or bl,20h ; set it palettetodac5: test cl,01h ; high-blue high? jz palettetodac6 ; nope or ch,20h ; set it palettetodac6: ret palettetodac endp dactopalette proc near mov cl,0 ; initialize RGB values to 0 test bh,10h ; low-red high? jz dactopalette1 ; nope or cl,20h ; set it dactopalette1: test bl,10h ; low-green high? jz dactopalette2 ; nope or cl,10h ; set it dactopalette2: test ch,10h ; low-blue high? jz dactopalette3 ; nope or cl,08h ; set it dactopalette3: test bh,20h ; high-red high? jz dactopalette4 ; nope or cl,04h ; set it dactopalette4: test bl,20h ; high-green high? jz dactopalette5 ; nope or cl,02h ; set it dactopalette5: test ch,20h ; high-blue high? jz dactopalette6 ; nope or cl,01h ; set it dactopalette6: ret dactopalette endp paltodac proc uses es si di mov si,0 ; initialize the loop values mov di,0 paltodacloop: mov cl,palettega[si] ; load up a single palette register call palettetodac ; convert it to VGA colors mov dacbox+0[di],bh ; save the red value mov dacbox+1[di],bl ; and the green value mov dacbox+2[di],ch ; and the blue value inc si ; bump up the registers add di,3 ; ... cmp si,16 ; more to go? jne paltodacloop ; yup. push ds ; set ES to DS temporarily pop es ; ... mov ax,15 ; do this 15 times to get to 256 mov di,offset dacbox+48 ; set up the first destination paltodacloop2: mov cx,24 ; copy another block of 16 registers mov si,offset dacbox ; set up for the copy rep movsw ; do it dec ax ; need to do another block? jnz paltodacloop2 ; yup. do it. ret ; we done. paltodac endp dactopal proc uses es si di mov si,0 ; initialize the loop values mov di,0 dactopalloop: mov bh,dacbox+0[di] ; load up the VGA red value mov bl,dacbox+1[di] ; and the green value mov ch,dacbox+2[di] ; and the blue value call dactopalette ; convert it to an EGA palette mov palettega[si],cl ; save as a single palette register inc si ; bump up the registers add di,3 ; ... cmp si,16 ; more to go? jne dactopalloop ; yup. mov cl,palettega ; copy palette 0 mov palettega+16,cl ; to the overscan register ret ; we done. dactopal endp ; *********************** Function loaddac() **************************** ; Function to Load the dacbox[][] array, if it can ; (sets gotrealdac to 0 if it can't, 1 if it can) loaddac proc uses es cmp dotmode, 29 ; truecolor? MCP 5-29-91 jne NotTPlusLoaddac mov ax,4402h push ax mov ax,256 * 3 push ax xor ax,ax push ax push ds mov ax,OFFSET dacbox push ax call far ptr TPlusLUT add sp, 10 or ax, ax jz NotTPlusLoaddac ; Didn't work, try a regular palette jmp loaddacdone NotTPlusLoaddac: cmp dotmode,19 ; roll-your-own video mode? jne loaddac_notyourown call far ptr readvideopalette cmp ax,-1 ; palette-write handled yet? jne go_loaddacdone ; yup. loaddac_notyourown: mov reallyega,0 ; set flag: not an EGA posing as a VGA cmp dotmode,9 ; TARGA 3 June 89 j mclain je go_loaddacdone cmp f85flag, 0 jne go_loaddacdone cmp xga_isinmode,0 ; XGA graphics mode? jne go_loaddacdone mov dacbox,255 ; a flag value to detect invalid DAC cmp debugflag,16 ; pretend we're not a VGA? je loaddacdebug ; yup. push ds ; ... pop es ; ... mov ax,1017h ; get the old DAC values mov bx,0 ; (assuming, of course, they exist) mov cx,256 ; ... mov dx,offset dacbox ; ... push bp int 10h ; do it. pop bp loaddacdebug: cmp dacbox,255 ; did it work? do we have a VGA? je loaddacega ; nope, go check ega cmp colors,16 ; 16 color vga? jne go_loaddacdone ; nope, all done cld ; yup, must straighten out dacbox, push ds ; 16 color vga uses indirection thru pop es ; palette select mov si,offset dacbox+60 ; dac[20] is used for color 6 so mov di,offset dacbox+18 ; copy dacbox[20] to dacbox[6] mov cx,3 ; ... rep movsb ; ... mov si,offset dacbox+168 ; dac[56-63] are used for colors 8-15 so mov di,offset dacbox+24 ; copy dacbox[56-63] to dacbox[8-15] mov cx,24 ; ... rep movsb ; ... go_loaddacdone: jmp short loaddacdone loaddacega: cmp colors,16 ; are we using 16 or more colors? jb loaddacdone ; nope. forget it. ;; cmp sydots,350 ; 640x350 range? cmp video_type,3 ; EGA or better? jb loaddacdone ; nope. forget it. mov bx,offset palettega ; make up a dummy palette mov cx,3800h ; start with color 0 == black loaddacega1: ; and color 8 == low-white mov 0[bx],cl ; save one color mov 8[bx],ch ; and another color inc bx ; bump up the DAC add cx,0101h ; and the colors cmp cl,8 ; finished 8 colors? jne loaddacega1 ; nope. get more. mov reallyega,1 ; note that this is really an EGA call far ptr paltodac ; "convert" it to a VGA DAC mov daclearn,1 ; bypass learn mode mov ax,cyclelimit ; and spin as fast as he wants mov daccount,ax ; ... loaddacdone: cmp colors,16 ; 16 color mode? jne loaddacdone2 ; nope cld ; yup, clear the excess dacbox mov cx,360 ; entries to all zeros for editpal sub ax,ax push ds pop es mov di,offset dacbox+48 rep stosw loaddacdone2: cmp tweakflag,0 ; tweaked mode? je loaddacdone3 ; nope mov dx,3c4h ; alter sequencer registers mov ax,0604h ; disable chain 4 out dx,ax loaddacdone3: mov gotrealdac,1 ; flag for whether mode supports DAC cmp dacbox,255 ; did DAC get loaded or fudged? jne loaddacret ; yup mov gotrealdac,0 ; nope loaddacret: ret loaddac endp ; *************** Function spindac(direction, rstep) ******************** ; Rotate the MCGA/VGA DAC in the (plus or minus) "direction" ; in "rstep" increments - or, if "direction" is 0, just replace it. spindac proc uses di si es, direction:word, rstep:word cmp dotmode,9 ; TARGA 3 June 89 j mclain je spinbailout cmp dotmode,11 ; disk video mode? je spinbailout cmp gotrealdac,0 ; do we have DAC registers to spin? je spinbailout ; nope. bail out. cmp colors,16 ; at least 16 colors? jge spindacdoit ; yup. spin away. spinbailout: jmp spindacreturn ; nope. bail out. spindacdoit: push ds ; need ES == DS here pop es ; ... cmp direction,0 ; just replace it? je newDAC ; yup. mov cx, rstep ; loop through the rotate "rstep" times stepDAC: push cx ; save the loop counter for a tad mov si,offset dacbox mov di,si mov ax,rotate_lo ; calc low end of rotate range cmp ax,colors ; safety check for 16 color mode jae nextDAC ; out of range, none to rotate add si,ax add si,ax add si,ax mov ax,rotate_hi ; calc high end of rotate range cmp ax,colors ; safety check for 16 color mode jb stepDAC2 ; ok, in range mov ax,colors ; out of range, use colors-1 dec ax ; ... stepDAC2: add di,ax add di,ax add di,ax mov cx,di ; size of rotate range - 1 sub cx,si jcxz nextDAC ; do nothing if range 0 cmp direction,1 ; rotate upwards? jne short downDAC ; nope. downwards mov bx,word ptr [si] ; save the first entry mov dl,byte ptr [si+2] ; ... cld ; set the direction mov di,si ; set up the rotate add si,3 ; ... rep movsb ; rotate it mov word ptr [di],bx ; store the last entry mov byte ptr [di+2],dl ; ... jmp short nextDAC ; set the new DAC downDAC: std ; set the direction mov bx,word ptr [di] ; save the last entry mov dl,byte ptr [di+2] ; ... mov si,di ; set up the rotate dec si ; ... add di,2 ; ... rep movsb ; rotate it mov word ptr [si+1],bx ; store the first entry mov byte ptr [si+3],dl ; ... cld ; reset the direction nextDAC: pop cx ; restore the loop counter loop stepDAC ; and loop until done. newDAC: cmp dotmode,19 ; roll-your-own video? jne spin_notyourown ; nope call far ptr writevideopalette cmp ax,-1 ; negative result? je go_spindoit ; yup. handle it locally. jmp spindacreturn ; else we done. go_spindoit: jmp spindoit spin_notyourown: cmp dotmode, 29 je TPlusOrXGAspindac cmp xga_isinmode,0 ; XGA extended graphics? je notxga TPlusOrXGAspindac: mov si,offset dacbox push si mov bx,0 xgalp1: mov al,[si+bx] ; adjust VGA -> XGA shl al,1 shl al,1 mov [si+bx],al inc bx cmp bx,768 jne xgalp1 cmp dotmode, 29 ; Are we a TARGA+? jne XGAPaletteCall ; nope - XGA mov ax,4403h push ax mov ax,256 * 3 push ax xor ax,ax push ax push ds mov ax,OFFSET dacbox push ax call far ptr TPlusLUT add sp, 10 jmp TPlusOrXGASet XGAPaletteCall: call far ptr xga_setpalette TPlusOrXGASet: pop si mov bx,0 xgalp2: mov al,[si+bx] ; adjust XGA -> VGA shr al,1 shr al,1 mov [si+bx],al inc bx cmp bx,768 jne xgalp2 jmp spindacreturn notxga: cmp bios_palette,0 ; BIOS palette updates forced? je not_bios_palette ; nope mov ax,1012h ; use a BIOS update mov bx,0 mov cx,256 push ds pop es mov dx,offset dacbox int 10h jmp spindacreturn not_bios_palette: cmp f85flag, 0 ; if 8514a then update pallette je spindoit jmp spin8514 spindoit: cmp colors,16 ; 16 color vga? jne spindoit2 ; nope cmp reallyega,1 ; is this really an EGA? je spindoit2 ; yup cld ; vga 16 color, straighten out dacbox, push ds ; 16 color vga uses indirection thru pop es ; palette select mov si,offset dacbox+18 ; dac[20] is used for color 6 so mov di,offset dacbox+60 ; copy dacbox[6] to dacbox[20] mov cx,3 ; ... rep movsb ; ... mov si,offset dacbox+24 ; dac[56-63] are used for colors 8-15 so mov di,offset dacbox+168 ; copy dacbox[8-15] to dacbox[56-63] mov cx,24 ; ... rep movsb ; ... spindoit2: mov bx,0 ; set up to update the DAC mov dacnorm,0 ; indicate no overflow dacupdate: mov cx,daccount ; ... mov ax,256 ; calculate 256 - BX sub ax,bx ; ... cmp ax,cx ; is that less than the update count? jge retrace1 ; nope. no adjustment mov cx,ax ; else adjust mov dacnorm,1 ; and indicate overflow retrace1: mov dx,03dah ; wait for no retrace in al,dx ; ... and al,8 ; this bit is high during a retrace jnz retrace1 ; so loop until it goes low retrace2: in al,dx ; wait for no retrace and al,8 ; this bit is high during a retrace jz retrace2 ; so loop until it goes high cmp reallyega,1 ; is this really an EGA? je spinega ; yup. spin it that way. cmp cpu,88 ; are we on a (yuck, ugh) 8088/8086? jle spinbios ; yup. go through the BIOS .186 mov dx,03c8h ; set up for a blitz-write mov ax,bx ; from this register cli ; critical section: no ints out dx,al ; starting register inc dx ; set up to update colors mov si, offset dacbox ; get starting addr in SI add si,bx ; ... add si,bx ; ... add si,bx ; ... mov ax,cx ; triple the value in CX add cx,ax ; ... add cx,ax ; ... rep outsb ; whap! Zango! They're updated! sti ; end of critical section mov cx,ax ; restore CX for code below jmp spindone ; skip over the BIOS version. .8086 spinbios: mov dx,offset dacbox ; set up the DAC box offset add dx,bx ; ... add dx,bx ; ... add dx,bx ; ... push bp ; save some registers push cx ; (AMSTRAD might need this) push dx ; ... push bx ; ... mov ax,1012h ; update the DAC int 10h ; do it. pop bx ; restore the registers pop dx ; ... pop cx ; ... pop bp ; ... jmp spindone ; jump to common code spinega: cmp bx,0 ; skip this if not the first time thru jne spindone ; ... push bx ; save some registers push cx ; aroud the call call far ptr dactopal ; convert the VGA DAC to an EGA palette pop cx ; restore the registers pop bx ; from prior to the call mov ax,1002h ; update the EGA palette mov dx,offset palettega ; ... int 10h ; do it. spindone: cmp daclearn,0 ; are we still in learn mode? jne nolearn ; nope. mov dx,03dah ; check for the retrace in al,dx ; ... and al,1 ; this bit is high if display disabled jz donelearn ; oops. retrace finished first. cmp dacnorm,0 ; was this a "short" update? jne short nolearn ; then don't increment it inc daccount ; increment the daccount value inc daccount ; increment the daccount value inc daccount ; increment the daccount value mov ax,cyclelimit ; collect the cycle-limit value cmp daccount,ax ; sanity check: don't update too far jle short nolearn ; proceed if reasonable. donelearn: sub daccount,6 ; done learning: reduce the daccount mov daclearn,1 ; set flag: no more learning cmp daccount,4 ; there's a limit to how slow we go jge nolearn ; ... mov daccount,4 ; ... nolearn: add bx,cx ; set up for the next batch cmp bx,256 ; more to go? jge spindacreturn ; nope. we done. jmp dacupdate ; yup. do it. spin8514: call w8514pal spindacreturn: ret spindac endp ; *************** Function find_special_colors ******************** ; Find the darkest and brightest colors in palette, and a medium ; color which is reasonably bright and reasonably grey. find_special_colors proc uses si mov color_dark,0 ; for default cases mov color_medium,7 ; ... mov color_bright,15 ; ... cmp colors,2 ; 2 color mode? jg fscnot2 mov color_medium,1 ; yup, set assumed values and return mov color_bright,1 ret fscnot2: cmp colors,16 ; < 16 color mode? (ie probably 4) jge fscnot4 mov color_medium,2 ; yup, set assumed values and return mov color_bright,3 ret fscnot4: cmp gotrealdac,0 ; dac valid? je fscret ; nope, return with defaults set earlier mov bh,255 ; bh is lowest brightness found yet sub bl,bl ; bl is highest found yet sub ah,ah ; ah is best found for medium choice yet mov si,offset dacbox ; use si as pointer to dac sub cx,cx ; use cx for color number fscloop: mov al,byte ptr 0[si] ; add red,green,blue (assumed all <= 63) add al,byte ptr 1[si] ; ... add al,byte ptr 2[si] ; ... cmp al,bh ; less than lowest found so far? jae fscchkbright mov color_dark,cx ; yup, note new darkest mov bh,al ; ... fscchkbright: cmp al,bl ; > highest found so far? jbe fscchkmedium mov color_bright,cx ; yup, note new brightest mov bl,al ; ... fscchkmedium: cmp al,150 ; too bright? jae fscnextcolor ; yup, don't check for medium add al,80 ; so the subtract below will be safe cmp al,ah ; already less than best found? jbe fscnextcolor mov dh,byte ptr 0[si] ; penalize by (maxgun-mingun)/2 mov dl,byte ptr 1[si] cmp dh,dl ; set dh to max gun jae fscmed1 xchg dh,dl ; now dh=max(0,1), dl=min(0,1) fscmed1: cmp dh,byte ptr 2[si] ; 2 > dh? jae fscmed2 mov dh,byte ptr 2[si] fscmed2: cmp dl,byte ptr 2[si] ; 2 < dl? jbe fscmed3 mov dl,byte ptr 2[si] fscmed3: sub dh,dl ; now subtract the penalty shr dh,1 sub al,dh cmp al,ah ; a new best? jbe fscnextcolor mov color_medium,cx ; yup, note new medium mov ah,al ; ... fscnextcolor: add si,3 ; point to next dac entry inc cx ; next color number cmp cx,colors ; scanned them all? jl fscloop ; nope, go around again cmp ah,0 ; find any medium color? jne fscret ; yup, all done mov ax,color_bright ; must be a pretty bright image, mov color_medium,ax ; use the brightest for medium fscret: ret find_special_colors endp ; *************** Functions get_a_char, put_a_char ******************** ; Get and put character and attribute at cursor ; Hi nybble=character, low nybble attribute. Text mode only get_a_char proc mov ah,8 xor bh,bh int 10h ret get_a_char endp put_a_char proc character:word mov ax,character mov bl,ah mov ah,9 xor bh,bh mov cx,1 int 10h ret put_a_char endp end