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Assembly Source File | 1989-12-18 | 98KB | 3,045 lines

; Generic assembler routines having to do with video adapters ; ; ---- Video Routines ; ; setvideomode() ; getcolor() ; putcolor() ; out_line() ; drawbox() ; home() ; movecursor() ; clscr() ; scrollup() ; putblock() ; putstr() ; scroll() ; storedac() TARGA - NEW - 3 June 89 j mclain ; loaddac() ; spindac() ; asmdotwrite (called by CALCMAND.ASM using registers) ; asmvideocleanup "" ; ; ---- Help (Video) Support ; ; setfortext() ; setforgraphics() ; setclear() ; ; 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 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 ; TARGA 28 May 80 - j mclain extrn StartTGA :far ; start TARGA extrn ReadTGA :far ; read TARGA extrn WriteTGA :far ; write TARGA extrn LineTGA :far ; line TARGA extrn EndTGA :far ; end TARGA ; 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 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 extrn linehgc :far ; Hercules line draw extrn charhgc :far ; Draw an ASCII char in Hercules graphics .DATA ; ************************ External variables ***************************** extrn oktoprint: word ; flag: == 1 if printf() will work extrn videoentry:byte ; video table entry flag extrn dotmode: word ; video mode: ; 1 = use the BIOS (yuck) ; 2 = use EGA/VGA style ; 3 = use MCGA style ; 4 = use Tseng 256 color ; 5 = use Paradise 256 color ; 6 = use Video 7 256 color ; 7 = MVGA 256 color ; 9 = use TARGA ; 10= Hercules ; 11= "disk" video ; 12= 8514/A ; 13= CGA 4,2-color ; 14= Tandy-1000 (someday) ; 15= use Trident 256 color ; 16= use Chips & Tech 256 color ; 17= use ATI VGA Wonder 256 color ; 18= use Everex 256 color ; 19= use roll-your-own ; (see YOURVID.C) ; 20= use ATI 1024 16 color ; 21= use tseng 16 color ; 22= use trident 16 color ; 23= use video7 16 color ; 24= use paradise 16 color ; 25= use chipstech 16 color ; 26= use everex 16 color extrn xdots:word, ydots:word ; number of dots across and down extrn maxit:word, colors:word ; maximum iterations, colors extrn ixmin:word, ixmax:word ; for zoom/pan: x and y limits extrn iymin:word, iymax:word ; for the local zoom-box 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 ; ************************ Public variables ***************************** public andcolor ; used by 'calcmand' 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 reallyega ; "really an EGA" (faking a VGA) flag ; arrays declared here, used elsewhere ; arrays not used simultaneously are deliberately overlapped ; ************************ Internal variables ***************************** 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 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 diskflag db 0 ; special "disk-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 ; ; Zoom-Box values (2K x 2K screens max) step dw 0 ; Zoom-Box drawing step-size boxcolor db 0 ; Zoom-Box color reallyega dw 0 ; 1 if its an EGA posing as a VGA 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 rowcount dw 0 ; row-counter for decoder and out_line orvideo db 0 ; "or" value for setvideo 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 ; ******************* "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 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 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 tweaktype dw 0 ; 8 or 9 (320x400 or 360x480) .CODE ; 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. ; This code has three entry points: ; ; sizeoftable = initvideotable(); returns the # of table entries ; ; fromvideotable(i); copies table entry #i into ; the videoentry structure ; ; tovideotable(i); moves the videoentry structure ; into the table at entry #i .code videotable db 0 ; video table actually starts on the NEXT byte ; Feel free to add your favorite video adapter to the following table. ; Just remember that only the first 100 or so entries get displayed and ; assigned Function keys. ; 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) Reserved for 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 ; |--Adapter/Mode-Name------|-------Comments-----------| ; |------INT 10H------|Dot-|--Resolution---| ; |--AX---BX---CX---DX|Mode|--X-|--Y-|Color| db "IBM Low-Rez EGA Quick but chunky " dw 0dh, 0, 0, 0, 2, 320, 200, 16 db "IBM 16-Color EGA Slower but lots nicer " dw 10h, 0, 0, 0, 2, 640, 350, 16 db "IBM 256-Color MCGA Quick and LOTS of colors " dw 13h, 0, 0, 0, 3, 320, 200, 256 db "IBM 16-Color VGA Nice high resolution " dw 12h, 0, 0, 0, 2, 640, 480, 16 db "IBM 4-Color CGA (Ugh - Yuck - Bleah) " dw 4h, 0, 0, 0, 13, 320, 200, 4 db "IBM Hi-Rez B&W CGA ('Hi-Rez' Ugh - Yuck) " dw 6h, 0, 0, 0, 13, 640, 200, 2 db "IBM B&W EGA (Monochrome EGA) " dw 0fh, 0, 0, 0, 2, 640, 350, 2 db "IBM B&W VGA (Monochrome VGA) " dw 11h, 0, 0, 0, 2, 640, 480, 2 db "IBM Med-Rez EGA (Silly but it's there!) " dw 0eh, 0, 0, 0, 2, 640, 200, 16 db "IBM VGA (non-std/no text) Register Compatibles ONLY " dw 0h, 0, 0, 9, 7, 320, 400, 256 db "IBM VGA (non-std/no text) Register Compatibles ONLY " dw 0h, 0, 0, 8, 7, 360, 480, 256 db "8514/A Low Res Requires IBM's HDIDLOAD " dw 3h, 0, 0, 1, 12, 640, 480, 256 db "8514/A High Res Requires IBM's HDIDLOAD " dw 3h, 0, 0, 1, 12,1024, 768, 256 db "8514/A Low W/Border Requires IBM's HDIDLOAD " dw 3h, 0, 0, 1, 12, 632, 474, 256 db "8514/A High W/Border Requires IBM's HDIDLOAD " dw 3h, 0, 0, 1, 12,1016, 762, 256 db "VESA Standard interface UNTESTED: may not work " dw 6ah, 0, 0, 0, 2, 800, 600, 16 db "COMPAQ Portable 386 OK: Michael Kaufman " dw 40h, 0, 0, 0, 1, 640, 400, 2 db "Video-7 Vram VGA OK: Ira Emus " dw 6f05h, 60h, 0, 0, 2, 752, 410, 16 db "Video-7 Vram VGA OK: Ira Emus " dw 6f05h, 61h, 0, 0, 2, 720, 540, 16 db "Video-7 Vram VGA OK: Ira Emus " dw 6f05h, 62h, 0, 0, 2, 800, 600, 16 db "Video-7 Vram VGA OK: Ira Emus " dw 6f05h, 63h, 0, 0, 1,1024, 768, 2 db "Video-7 Vram VGA OK: Ira Emus " dw 6f05h, 64h, 0, 0, 1,1024, 768, 4 db "Video-7 Vram VGA w/512K OK: Sandy & Frank Lozier " dw 6f05h, 65h, 0, 0, 23,1024, 768, 16 db "Video-7 Vram VGA OK: Michael Kaufman " dw 6f05h, 66h, 0, 0, 6, 640, 400, 256 db "Video-7 w/512K OK: Greg Reznick " dw 6f05h, 67h, 0, 0, 6, 640, 480, 256 db "Video-7 w/512K OK: Greg Reznick " dw 6f05h, 68h, 0, 0, 6, 720, 540, 256 db "Video-7 w/512K OK: Greg Reznick " dw 6f05h, 69h, 0, 0, 6, 800, 600, 256 db "Tseng SuperVGA tweaked (adds missing Tseng mode) " dw 0h, 0, 0, 10, 4, 640, 400, 256 db "Orchid/STB/GENOA/SIGMA OK: Monte Davis " dw 2eh, 0, 0, 0, 4, 640, 480, 256 db "Orchid/STB/GENOA/SIGMA OK: Monte Davis " dw 29h, 0, 0, 0, 2, 800, 600, 16 db "Orchid/STB/GENOA/SIGMA OK: Monte Davis " dw 30h, 0, 0, 0, 4, 800, 600, 256 db "Orchid/STB/GENOA/SIGMA OK: Timothy Wegner " dw 37h, 0, 0, 0, 21,1024, 768, 16 db "GENOA/STB OK: Timothy Wegner " dw 2dh, 0, 0, 0, 4, 640, 350, 256 db "GENOA OK: Timothy Wegner " dw 27h, 0, 0, 0, 2, 720, 512, 16 db "GENOA OK: Timothy Wegner " dw 2fh, 0, 0, 0, 4, 720, 512, 256 db "GENOA OK: Timothy Wegner " dw 7ch, 0, 0, 0, 2, 512, 512, 16 db "GENOA OK: Timothy Wegner " dw 7dh, 0, 0, 0, 4, 512, 512, 256 db "STB UNTESTED: may not work " dw 36h, 0, 0, 0, 1, 960, 720, 16 db "Everex EVGA OK: Travis Harrison " dw 70h, 0, 0, 0, 2, 640, 480, 16 db "Everex EVGA OK: Travis Harrison " dw 70h, 1h, 0, 0, 2, 752, 410, 16 db "Everex EVGA OK: Travis Harrison " dw 70h, 2h, 0, 0, 2, 800, 600, 16 db "Everex EVGA OK: Travis Harrison " dw 70h, 11h, 0, 0, 1,1280, 350, 4 db "Everex EVGA OK: Travis Harrison " dw 70h, 12h, 0, 0, 1,1280, 600, 4 db "Everex EVGA UNTESTED: may not work " dw 70h, 13h, 0, 0, 18, 640, 350, 256 db "Everex EVGA UNTESTED: may not work " dw 70h, 14h, 0, 0, 18, 640, 400, 256 db "Everex EVGA UNTESTED: may not work " dw 70h, 15h, 0, 0, 18, 512, 480, 256 db "ATI EGA Wonder OK: Garrett Wollman " dw 51h, 0, 0, 0, 1, 640, 480, 16 db "ATI EGA Wonder OK: Garrett Wollman " dw 52h, 0, 0, 0, 1, 800, 560, 16 db "ATI VGA Wonder OK: Henry So " dw 54h, 0, 0, 0, 2, 800, 600, 16 db "ATI VGA Wonder OK: Mark Peterson " dw 61h, 0, 0, 0, 17, 640, 400, 256 db "ATI VGA Wonder (512K) OK: Mark Peterson " dw 62h, 0, 0, 0, 17, 640, 480, 256 db "ATI VGA Wonder (512K) OK: Mark Peterson " dw 63h, 0, 0, 0, 17, 800, 600, 256 db "ATI VGA Wonder (512K) OK: Mark Peterson " dw 65h, 0, 0, 0, 20,1024, 768, 16 db "Paradise EGA-480 UNTESTED: may not work " dw 50h, 0, 0, 0, 1, 640, 480, 16 db "Pdise/AST/COMPAQ VGA OK: Tom Devlin " dw 5eh, 0, 0, 0, 5, 640, 400, 256 db "Pdise/AST/COMPAQ VGA OK: Phil Wilson " dw 5fh, 0, 0, 0, 5, 640, 480, 256 db "Pdise/AST/COMPAQ VGA OK: by Chris Green " dw 58h, 0, 0, 0, 2, 800, 600, 16 db "Pdise/AST/COMPAQ VGA OK: Phil Wilson " dw 59h, 0, 0, 0, 1, 800, 600, 2 db "Tandy 1000 16 Clr LoRez OK: Tom Price " dw 8h, 0, 0, 0, 1, 160, 200, 16 db "Tandy 1000 16 Color CGA OK: Tom Price " dw 9h, 0, 0, 0, 1, 320, 200, 16 db "Tandy 1000 4 Color hi-rez OK: Tom Price " dw 0ah, 0, 0, 0, 1, 640, 200, 4 db "AT&T 6300 UNTESTED: may not work " dw 41h, 0, 0, 0, 1, 640, 200, 16 db "AT&T 6300 OK: Michael Kaufman " dw 40h, 0, 0, 0, 1, 640, 400, 2 db "AT&T 6300 OK: Colby Norton " dw 42h, 0, 0, 0, 1, 640, 400, 16 db "TARGA 256 Color video OK: Bruce Goren " dw 0h, 0, 0, 0, 9, 512, 482, 256 db "TARGA 256 Color 35mm OK: Bruce Goren " dw 0h, 0, 0, 0, 9, 512, 342, 256 db "TARGA 256 Color 4 x 5 OK: Bruce Goren " dw 0h, 0, 0, 0, 9, 512, 384, 256 db "TRIDENT Chipset OK: Warren Gold " dw 5bh, 0, 0, 0, 2, 800, 600, 16 db "TRIDENT Chipset OK: Warren Gold " dw 5ch, 0, 0, 0, 15, 640, 400, 256 db "TRIDENT Chipset OK: Warren Gold " dw 5dh, 0, 0, 0, 15, 640, 480, 256 db "TRIDENT Chipset OK: Warren Gold " dw 5eh, 0, 0, 0, 15, 800, 600, 256 db "TRIDENT Chipset UNTESTED: May not work " dw 5fh, 0, 0, 0, 22,1024, 768, 16 db "Chips & Tech Chipset OK: Andy Fu " dw 78h, 0, 0, 0, 16, 640, 400, 256 db "Chips & Tech Chipset OK: Andy Fu " dw 79h, 0, 0, 0, 16, 640, 480, 256 db "Chips & Tech Chipset OK: Andy Fu " dw 7bh, 0, 0, 0, 16, 800, 600, 256 db "Chips & Tech Chipset OK: Andy Fu " dw 70h, 0, 0, 0, 2, 800, 600, 16 db "Chips & Tech Chipset UNTESTED: May not work " dw 72h, 0, 0, 0, 25,1024, 768, 16 db "Hercules Graphics OK: Timothy Wegner " dw 8h, 0, 0, 0, 10, 720, 348, 2 db "Disk/RAM 'Video' Full-Page Epson @ 60DPI " dw 3h, 0, 0, 0, 11, 768, 480, 2 db "Disk/RAM 'Video' Full-Page Epson @ 120DPI " dw 3h, 0, 0, 0, 11, 768, 960, 2 db "Disk/RAM 'Video' Full-Page Epson @ 240DPI " dw 3h, 0, 0, 0, 11, 768,1920, 2 db "Disk/RAM 'Video' Full-Page L-Jet @ 75DPI " dw 3h, 0, 0, 0, 11, 800, 600, 2 db "Disk/RAM 'Video' Full-Page L-Jet @ 150DPI " dw 3h, 0, 0, 0, 11,1600,1200, 2 db "Disk/RAM 'Video' For Background Fractals " dw 3h, 0, 0, 0, 11, 320, 200, 256 db "Disk/RAM 'Video' For Background Fractals " dw 3h, 0, 0, 0, 11, 360, 480, 256 db "Disk/RAM 'Video' For Background Fractals " dw 3h, 0, 0, 0, 11, 640, 350, 256 db "Disk/RAM 'Video' For Background Fractals " dw 3h, 0, 0, 0, 11, 640, 400, 256 db "Disk/RAM 'Video' For Background Fractals " dw 3h, 0, 0, 0, 11, 640, 480, 256 db "Disk/RAM 'Video' For Background Fractals " dw 3h, 0, 0, 0, 11, 800, 600, 256 db "Disk/RAM 'Video' For Background Fractals " dw 3h, 0, 0, 0, 11,1024, 768, 256 db "Disk/RAM 'Video' For Background Fractals " dw 3h, 0, 0, 0, 11,2048,2048, 256 db "IBM VGA (+tweaked+) Register Compatibles ONLY " dw 0h, 0, 0, 1, 2, 704, 528, 16 db "IBM VGA (+tweaked+) Register Compatibles ONLY " dw 0h, 0, 0, 2, 2, 720, 540, 16 db "IBM VGA (+tweaked+) Register Compatibles ONLY " dw 0h, 0, 0, 3, 2, 736, 552, 16 db "IBM VGA (+tweaked+) Register Compatibles ONLY " dw 0h, 0, 0, 4, 2, 752, 564, 16 db "IBM VGA (+tweaked+) Register Compatibles ONLY " dw 0h, 0, 0, 5, 2, 768, 576, 16 db "IBM VGA (+tweaked+) Register Compatibles ONLY " dw 0h, 0, 0, 6, 2, 784, 588, 16 db "IBM VGA (+tweaked+) Register Compatibles ONLY " dw 0h, 0, 0, 7, 2, 800, 600, 16 db "END Must be the END of list " dw 0h, 0, 0, 0, 0, 0, 0, 0 db 680 dup(0) ; room for 10 more video modes .code initvideotable proc uses ds es di mov di, offset videotable+1 ; get the start of the video table mov ax,0 ; initially, no entries found initvideotableloop: cmp word ptr cs:66[di],0 ; does the next entry have any colors? je initvideotablereturn ; nope. we done. inc ax ; indicate we found an entry add di,68 ; locate the next entry jmp initvideotableloop ; and try again. initvideotablereturn: ret initvideotable endp fromvideotable proc uses es si di, tablenumber:word push cs ; get the video table segment into ES pop es ; ... mov cx,68 ; retrieve the table entry length mov ax,tablenumber ; compute the video table offset mul cl ; == that entry # x the entry length add ax,offset videotable+1 ; + the start of the table mov si,ax ; store it here mov di,offset videoentry ; get the offset of the entry ptr push ds ; swap DS and ES temporarily push es ; ... pop ds ; ... pop es ; ... rep movsb ; move it push es ; restore DS again pop ds ; ... mov di,offset videoentry ; get the offset of the entry ptr mov al,0 ; stuff a few zeroes in where appr. mov 25[di],al ; ... mov 51[di],al ; ... ret fromvideotable endp tovideotable proc uses es si di, tablenumber:word push cs ; get the video table segment into ES pop es ; ... mov cx,68 ; retrieve the table entry length mov ax,tablenumber ; compute the video table offset mul cl ; == that entry # x the entry length add ax,offset videotable+1 ; + the start of the table mov di,ax ; store it here mov si,offset videoentry ; get the offset of the entry ptr rep movsb ; move it ret tovideotable endp ; Routines called by this code ; **************** Routines called by 'calcmand.asm' ********************* ; ; parameters passed directly in registers - just call near routine asmdotwrite proc far ; called by 'calcmand.asm' call dotwrite ; call the appropriate write-a-dot ret ; we done asmdotwrite endp asmvideocleanup proc far ; called by 'calcmand.asm' call videocleanup ; call the local routine ret ; we done. asmvideocleanup 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 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 cgawrite proc near ; CGA 320x200 4-color, 640x200 2-color mov bx,colors ; restrict ourselves to the color cnt dec bx ; ... and al,bl ; ... push es ; save ES for a bit push ax ; save AX for a bit call near ptr cgasegoff ; compute the segment and offset mov dl,es:[bx] ; retrieve the byte and dl,al ; clear out the proper bits pop ax ; restore AX (the color) shl al,cl ; apply the shift mask or dl,al ; add in the color mov es:[bx],dl ; and write the color back out pop es ; restore ES ret ; we done cgawrite endp cgaread proc near ; CGA 320x200 4-color, 640x200 2-color push es ; save ES for a bit call near ptr cgasegoff ; compute the segment and offset mov dl,es:[bx] ; retrieve the byte not al ; reset AL for the AND and al,dl ; clear out all but the proper bits shr al,cl ; apply the shift mask mov ah,0 ; clear out the high byte pop es ; restore ES ret ; we done cgaread endp cgasegoff proc near ; common CGA routine mov ax,0b800h ; buffer is really here shr dx,1 ; provide the interleaving logic jnc cgasegeven ; skip if odd add ax,200h ; use the other half of the buffer cgasegeven: mov es,ax ; set it up mov bx,dx ; each row is 80 bytes - shift shl bx,1 ; instead of multiply (8088s multiply shl bx,1 ; REAL slowly) shl bx,1 ; ... shl bx,1 ; ... mov ax,bx ; x*80 = (x<<4) + ((x<<4)<<2) shl bx,1 ; ... shl bx,1 ; ... add ax,bx ; (Finally!) cmp colors,2 ; 2-color mode? je short cgaseg2color ; yup. branch off mov bx,cx ; get the column offset shr bx,1 ; four columns per byte shr bx,1 ; ... add bx,ax ; BX now contains the offset and cx,3 ; calculate the bit mask xor cx,3 ; ... shl cx,1 ; shift left this many bits push cx ; save the bit shift mov al,0fch ; set up the bit mask rol al,cl ; AL now contains the bit mask pop cx ; restore the shift count ret ; we done. cgaseg2color: ; two-color option mov bx,cx ; get the column offset shr bx,1 ; eight columns per byte shr bx,1 ; ... shr bx,1 ; ... add bx,ax ; BX now contains the offset and cx,7 ; calculate the bit mask xor cx,7 ; ... push cx ; save the bit shift mov al,0feh ; set up the bit mask rol al,cl ; AL now contains the bit mask pop cx ; restore the shift count ret cgasegoff endp mcgawrite proc near ; MCGA 320*200, 246 colors push ax ; save this for a tad mov ax,xdots ; this many dots / line mul dx ; times this many lines add ax,cx ; plus this many x-dots mov bx,ax ; save this in BX pop ax ; restore AX mov es:[bx],al ; write the dot ret ; we done. mcgawrite endp mcgaread proc near ; MCGA 320*200, 246 colors mov ax,xdots ; this many dots / line mul dx ; times this many lines add ax,cx ; plus this many x-dots mov bx,ax ; save this in BX 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,xdots ; 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,xdots ; 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 ; 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,xdots shr ax,1 shr ax,1 ; now ax = xdots/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,xdots shr ax, 1 shr ax, 1 ; now ax = xdots/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 test cl,1 ; is X odd? jz atireadhigh ; Nope. Use the high bits 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 test cl,1 ; is X odd? jz atiwritehigh ; Nope. Use the high bits 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,xdots ; 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,xdots ; 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) ; ; ; Copyright 1988,89 John Bridges ; Free for use in commercial, shareware or freeware applications ; ; BANKS.ASM ; ; .data public curbk curbk dw 0ffffh ;current bank number public tseng,trident,video7,paradise,chipstech,ativga,everex tseng dw 0 trident dw 0 video7 dw 0 paradise dw 0 chipstech dw 0 ativga dw 0 everex dw 0 .code newbank proc ;bank number is in AX cli mov [curbk],ax cmp [tseng],0 jz nots push ax ;Tseng 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 nots: cmp [trident],0 jz notri push ax ;Trident 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 [curbk] xor ah,2 mov dx,3c4h mov al,0eh out dx,ax sti pop dx pop ax ret notri: cmp [video7],0 jz nov7 push ax ;Video 7 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 nov7: cmp [paradise],0 jz nopd push ax ;Paradise push dx mov dx,3ceh mov ax,50fh ;turn off write protect on VGA registers out dx,ax mov ah,byte ptr [curbk] shl ah,1 ;change 64k bank number into 4k bank number shl ah,1 shl ah,1 shl ah,1 mov al,9 out dx,ax sti pop dx pop ax ret nopd: cmp [chipstech],0 jz noct push ax ;Chips & Tech push dx ; mov dx,46e8h ;place chip in setup mode ; mov ax,1eh ; out dx,ax ; mov dx,103h ;enable extended registers ; mov ax,0080 ; out dx,ax ; mov dx,46e8h ;bring chip out of setup mode ; mov ax,0eh ; out dx,ax mov ah,byte ptr [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 noct: cmp [ativga],0 jz noati push ax ;ATI VGA Wonder 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 noati: cmp [everex],0 jz noev push ax ;Everex push cx push dx sti 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 pop dx pop cx pop ax ret noev: sti ret newbank endp videowrite proc near ; your-own-video write routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call 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 pop cx ; restore registers pop dx ; restore registers pop ax ; restore registers pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. videowrite endp videoread proc near ; your-own-video read routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call push dx ; 'y' parameter push cx ; 'x' parameter call far ptr readvideo ; let the external routine do it pop cx ; restore registers pop dx ; restore registers pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. videoread endp videostart proc near ; your-own-video start routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call call far ptr startvideo ; let the external routine do it pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. videostart endp videoend proc near ; your-own-video end routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call call far ptr endvideo ; let the external routine do it pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. videoend endp diskwrite proc near ; disk-video write routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call mov ah,0 ; clear the high-order color byte push ax ; colors parameter push dx ; 'y' parameter push cx ; 'x' parameter call far ptr writedisk ; let the external routine do it pop cx ; restore registers pop dx ; restore registers pop ax ; restore registers pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. diskwrite endp diskread proc near ; disk-video read routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call push dx ; 'y' parameter push cx ; 'x' parameter call far ptr readdisk ; let the external routine do it pop cx ; restore registers pop dx ; restore registers pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. diskread endp diskstart proc near ; disk-video start routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call call far ptr startdisk ; let the external routine do it pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. diskstart endp diskend proc near ; disk-video end routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call call far ptr enddisk ; let the external routine do it pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. diskend endp ; *********************************************************************** ; ; TARGA MODIFIED 1 JUNE 89 - j mclain ; tgawrite proc near ; push es ; push si ; push di ; push ax ; colors parameter push dx ; 'y' parameter push cx ; 'x' parameter call far ptr WriteTGA ; writeTGA( x, y, color ) pop cx ; pop dx ; pop ax ; pop di ; pop si ; pop es ; ret ; tgawrite endp tgaline proc near ; push es ; push si ; push di ; mov ax,xdots ; pixels on line push ax ; mov ax,rowcount ; line to do it too push ax ; push ds ; far ptr push si ; line data call far ptr LineTGA ; lineTGA( ldata, line, cnt ) add sp,8 ; stack bias pop di ; pop si ; pop es ; ret tgaline endp tgaread proc near ; push es ; push si ; push di ; push dx ; 'y' parameter push cx ; 'x' parameter call far ptr ReadTGA ; readTGA( x, y ) pop cx ; pop dx ; pop di ; pop si ; pop es ; ret ; tgaread endp tgastart proc near ; push es ; push si ; push di ; mov ax,ydots push ax mov ax,xdots push ax call far ptr StartTGA ; startTGA( xdim, ydim ) add sp,4 ; stack bias, pointer to dacbox pop di ; pop si ; pop es ; ret ; tgastart endp tgaend proc near ; push es ; push si ; push di ; call far ptr EndTGA ; endTGA( void ) pop di ; pop si ; pop es ; mov tgaflag,0 ; ret ; tgaend 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 push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call 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 pop cx ; restore registers pop dx ; restore registers pop ax ; restore registers pop di ; restore registers pop si ; restore registers pop es ; restore registers ret hgcwrite endp hgcread proc near push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call push dx ; 'y' parameter push cx ; 'x' parameter call far ptr readhgc ; call the Hercules Read dot routine pop cx ; restore registers pop dx ; restore registers pop di ; restore registers pop si ; restore registers pop es ; restore registers ret hgcread endp hgcstart proc near ; hercules start routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call call far ptr inithgc ; let the external routine do it pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. hgcstart endp hgcend proc near ; hercules end routine push es ; save registers around the call push si ; save registers around the call push di ; save registers around the call call far ptr termhgc ; let the external routine do it pop di ; restore registers pop si ; restore registers pop es ; restore registers ret ; we done. hgcend endp ; **************** internal Write-a-line routines *********************** ; ; These Routines all assume the following register values: ; ; SI = Offset of array of colors for a row normaline proc near ; Normal Line: no assumptions xor cx,cx ; zero the counter normal_line1: mov dx,rowcount ; set the y-pixel mov bx,si ; locate the actual pixel color add bx,cx ; ... mov al,[bx] ; retrieve the color push cx ; save the counter 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 cx ; restore the counter inc cx ; bump it up cmp cx,xdots ; more to go? jl normal_line1 ; yup. do it. ret normaline endp mcgaline proc near ; MCGA 320*200, 246 colors mov ax,xdots ; this many dots / line mul rowcount ; times this many lines mov di,ax ; di = offset of row in video memory mov cx,xdots ; move this many bytes shr cx,1 ; convert bytes to words rep movsw ; zap line into memory ret mcgaline endp vgaline proc near ; Bank Switch EGA/VGA line write mov ax,xdots ; compute # of dots / pass shr ax,1 ; (given 8 passes) shr ax,1 ; ... shr ax,1 ; ... mov cx,ax ; save the dots / pass here xor dx,dx mul rowcount ; now calc first video addr cmp dx,curbk ; see if bank changed jne bank_is_changing ; if bank change call normaline ;same_bank: mov di,ax ; save the starting addr here mov dx,03ceh ; set up graphics cntrlr addr mov ax,8008h ; set up for the bit mask vgaline1: out dx,ax ; set the graphics bit mask push ax ; save registers for a tad push cx ; ... 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 loop vgaline2 ; loop if more dots this pass pop di ; restore the saved registers pop si ; ... pop cx ; ... pop ax ; ... inc si ; offset the source 1 byte ror ah,1 ; alter bit mask value cmp ah,80h ; already done all 8 of them? jne vgaline1 ; nope. do another one. call videocleanup ; else cleanup time. ret ; and we done. bank_is_changing: call normaline ; just calling newbank didn't quite ret ; work. This depends on no bank vgaline endp ; change mid line (ok for 1024 wide) super256line proc near ; super VGA 256 colors mov ax,xdots ; this many dots / line mov cx,rowcount ; cx = row mul cx ; 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 cx ; next row mov ax,xdots ; this many dots / line mul cx ; times this many lines sub ax,1 ; back up some to the last pixel of the sbb dx,0 ; previous line pop cx ; bank at start of row cmp dl,cl ; did bank change? pop di ; di = offset of row in video memory jne bank_did_chg mov cx,xdots ; move this many bytes shr cx,1 ; convert bytes to words rep movsw ; zap line into memory jmp short linedone bank_did_chg: call normaline ; normaline can handle bank change linedone: ret super256line endp tweak256line proc near ; Normal Line: no assumptions mov cx,xdots shr cx, 1 shr cx, 1 ; now ax = xdots/4 mov ax,cx ; calculate the first video address mul rowcount ; (pixel 0 on this line) mov di,ax ; save the first address here mov al,MAP_MASK ; set up for the bit plane adjustment mov ah,1 ; (first plane first) mov dx,SC_INDEX ; ... tweak256line1: OUT_WORD ; set up the bit plane push ax ; save a few registers around the loop push cx ; ... 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 ; ... pop ax ; ... inc si ; offset the source 1 byte shl ah,1 ; set up for the next video plane cmp ah,16 ; there IS a next plane, isn't there? jne tweak256line1 ; yup. perform another loop. ret tweak256line endp f85line proc near mov ax, 0 ;a line is a box one line high mov bx, rowcount mov cx, xdots mov dx, 1 call fr85wbox ;put out the box ret f85line 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 ; ******************** Function drawbox(newbox) ************************** ; if newbox == 0, just erase old box. Else erase old and draw new. drawbox proc uses di si es, newbox:word mov step,1 ; default step: every pixel mov ax,ixmax ; just how big is this zoom-box? sub ax,ixmin ; this many dots,... shl ax,1 ; an eighth of the screen or less? shl ax,1 ; ... shl ax,1 ; ... cmp ax,xdots ; ... jb short solidbox ; yup. keep the box solid. mov step,2 ; nope. make the box every other pixel solidbox: shr ax,1 ; a quarter of the screen or less? cmp ax,xdots ; ... jb short solidbox2 ; yup. keep the box (semi) solid. mov step,4 ; nope. make the box every 4th pixel solidbox2: mov ax,colors ; define the zoom-box color dec al ; ... cmp al,15 ; do we have 16 colors? jbe short whitebox ; nope. use what we can get. mov al,15 ; force a white zoom box whitebox: ; TARGA 3 June 89 j mclain ; mov xorTARGA,1 ; faster to flag xorTARGA rather ; than check if TARGA is runnin notTGAbox: mov boxcolor,al ; save the box color push es ; save the original ES value 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 js short calcnewbox ; oops. no old box to clear. 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. calcnewbox: mov boxcount,0 ; set counter flag: no dots yet cmp newbox,0 ; should we draw a new box? jne short calcnewbox2 ; yup. jmp endofdrawbox ; nope. bail out now. calcnewbox2: mov bx,boxcount ; get set to draw lines shl bx,1 ; switch to word pointers starttop: mov cx,ixmin ; now, draw the top line. mov dx,iymin ; ... topline: mov boxx[bx],cx ; save this point. mov boxy[bx],dx ; ... add bx,2 ; bump up the pointer offsets inc boxcount ; and counters add cx,step ; calculate the next dot address cmp cx,ixmax ; gone past the end-of-line? jbe short topline ; nope. try again. startbottom: mov cx,ixmin ; now, draw the bottom line. mov dx,iymax ; ... bottomline: mov boxx[bx],cx ; save this point. mov boxy[bx],dx ; ... add bx,2 ; bump up the pointer offsets inc boxcount ; and counters add cx,step ; calculate the next dot address cmp cx,ixmax ; gone past the end-of-line? jbe short bottomline ; nope. try again. startleft: mov cx,ixmin ; now, draw the left line. mov dx,iymin ; ... leftline: mov boxx[bx],cx ; save this point. mov boxy[bx],dx ; ... add bx,2 ; bump up the pointer offsets inc boxcount ; and counters add dx,step ; calculate the next dot address cmp dx,iymax ; gone past the end-of-line? jbe short leftline ; nope. try again. startright: mov cx,ixmax ; now, draw the right line. mov dx,iymin ; ... rightline: mov boxx[bx],cx ; save this point. mov boxy[bx],dx ; ... add bx,2 ; bump up the pointer offsets inc boxcount ; and counters add dx,step ; calculate the next dot address cmp dx,iymax ; gone past the end-of-line? jbe short rightline ; nope. try again. endlines: 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 al,boxcolor ; set the (new) box color 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. ; TARGA 3 June 89 j mclain ; mov xorTARGA,0 ; in case of TARGA, no more xor ; endofdrawbox: call videocleanup ; perform any video cleanup required pop es ; restore ES register ret ; we done. drawbox 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 cmp videoflag,1 ; say, was the last video your-own? jne novideovideo ; nope. call videoend ; yup. end the your-own-video mode mov videoflag,0 ; set flag: no your-own-video jmp short notarga novideovideo: cmp diskflag,1 ; say, was the last video disk-video? jne nodiskvideo ; nope. call diskend ; yup. end the disk-video mode mov diskflag,0 ; set flag: no disk-video jmp short notarga nodiskvideo: cmp tgaflag,1 ; TARGA MODIFIED 2 June 89 j mclain jne notarga call tgaend mov tgaflag,0 ; set flag: targa cleaned up notarga: 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 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 ; prepare special video-mode speedups 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 oktoprint,1 ; say it's OK to use printf() 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 cgacolor ; mode 13 dw offset dullnormalmode ; 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 dullnormalmode ; mode 26 dw offset dullnormalmode ; mode 27 dw offset dullnormalmode ; mode 28 dw offset dullnormalmode ; mode 29 dw offset dullnormalmode ; mode 30 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 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 jmp videomode ; return to common code tseng16mode: mov tseng,1 ; set chipset flag jmp vgamode ; set ega/vga functions trident16mode: mov trident,1 ; set chipset flag jmp vgamode video716mode: mov video7,1 ; set chipset flag jmp vgamode paradise16mode: mov paradise,1 ; set chipset flag jmp vgamode chipstech16mode: mov chipstech,1 ; set chipset flag jmp vgamode everex16mode: mov everex,1 ; set chipset flag jmp vgamode egamode: vgamode: 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 jmp videomode ; return to common code tseng256mode: mov tseng,1 ; set chipset flag jmp super256mode ; set super VGA linear memory functions paradise256mode: mov paradise,1 ; set chipset flag jmp super256mode ; set super VGA linear memory functions video7256mode: mov video7, 1 ; set chipset flag jmp super256mode ; set super VGA linear memory functions trident256mode: mov trident,1 ; set chipset flag jmp super256mode ; set super VGA linear memory functions chipstech256mode: mov chipstech,1 ; set chipset flag jmp super256mode ; set super VGA linear memory functions ati256mode: mov ativga,1 ; set chipset flag jmp super256mode ; set super VGA linear memory functions everex256mode: mov everex,1 ; set chipset flag 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 jmp videomode ; return to common code tweak256mode: 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 the normal linewrite routine jmp videomode ; return to common code cgacolor: mov ax,offset cgawrite ; set up CGA write-a-dot mov bx,offset cgaread ; set up CGA read-a-dot mov cx,offset normaline ; set up the normal linewrite routine 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 jmp videomode ; return to common code diskmode: call diskstart ; start up the disk routines 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 diskflag,1 ; flag "disk-end" needed. jmp videomode ; return to common code yourownmode: call videostart ; start up your-own-video routines 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 videoflag,1 ; flag "your-own-end" needed. jmp videomode ; return to common code targaMode: ; TARGA MODIFIED 2 June 89 - j mclain call tgastart ; mov ax,offset tgawrite ; mov bx,offset tgaread ; ; mov cx,offset tgaline ; mov cx,offset normaline ; set up the normal linewrite routine mov tgaflag,1 ; jmp videomode ; return to common code f8514mode: ; 8514 modes cmp videodx, 1 ; requiring dx=1 for turn on allows jne not8514on ; setvideomode(3,0,0,0) to display text call open8514 ; start the 8514a jnc f85ok mov dotmode, 0 ; if problem starting use normal mode not8514on: 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 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 f85flag,1 ; mov oktoprint,0 ; NOT OK to printf() in this mode jmp videomode ; return to common code videomode: mov dotwrite,ax ; save the results mov dotread,bx ; ... mov linewrite,cx ; ... 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 setvideo proc near ; local set-video more cmp ax,0 ; TWEAK?: look for AX==BX==CX==0 jne short setvideobios ; ... cmp bx,0 ; ... jne short setvideobios ; ... cmp cx,0 ; ... je short setvideoregs ; ... setvideobios: 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 jmp setvideoreturn ; and return. setvideoregs: ; assume genuine VGA and program regs 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,10 ; Tseng tweak? je tsengtweak ; yup 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; isatweaktype: 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. mov ax,1124h ; load ROM 8*16 characters mov bx,0 mov dh,0 mov dl,byte ptr [si+1] ; number of rows on the screen int 10h is256: push es ; save ES for a tad mov ax,40h ; Video BIOS DATA area mov es,ax ; ... mov ah,0 mov al,byte ptr [si] ; number of columns on the screen mov word ptr es:[4ah],ax mul byte ptr [si+1] ; number of characters on the screen shl ax,1 ; (attributes, also) mov word ptr es:[4ch],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 mov dx,03c4h ; Sequencer Synchronous reset mov ax,0100h ; set sequencer reset out dx,ax mov dx,03c2h ; Update Misc Output Reg mov al,0E7h 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 ret setvideo endp maybeor proc near ; or AL or BL for mon-destr switch cmp ah,6fh ; video-7 special mode? je maybeor1 ; yup. do this one different or al,orvideo ; normal non-destructive switch jmp short maybeor2 ; we done. maybeor1: or bl,orvideo ; video-7 switch maybeor2: 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() [which may be wierd] setfortext proc uses es si di cmp dotmode, 12 ;check for 8514 jne tnot8514 cmp f85flag, 0 ;check 8514 active flag je dosettext call close8514 ;close adapter if not mov f85flag, 0 jmp short dosettext tnot8514: cmp videoax,0 ; check for CGA modes je setfortextnocga ; not this one cmp ydots,348 ; (only Hercules modes have this res) je setfortextcga ; ... cmp videoax,7 ; ... ja setfortextnocga ; not this one setfortextcga: 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 ; ... mov cx,2000h ; save this many words cmp ydots,348 ; (only Hercules modes have this res) jne setfortextcganoherc ; ... mov di,0 ; (save 32K) mov ax,0b000h ; (from here) mov cx,4000h ; (save this many words) setfortextcganoherc: 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 ;check for Hercules-specific dotmode jne tnotHGC cmp HGCflag, 0 ;check HGC active flag je dosettext call hgcend ;close adapter if not mov HGCflag, 0 jmp short dosettext tnotHGC: 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 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,2000h ; 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,2000h ; this many blanks rep stosw ; do it. mov ax,20h ; enable the video (I think) call disablevideo ; ... setfortextreturn: call far ptr home ; home the cursor ret setfortext endp setforgraphics proc uses es si di cmp dotmode, 12 ;check for 8514 jne gnot8514 cmp f85flag, 0 jne f85isgraphics call reopen8514 mov f85flag, 1 f85isgraphics: jmp setforgraphicsreturn gnot8514: cmp videoax,0 ; check for CGA modes je setforgraphicsnocga ; not this one cmp ydots,348 ; (only Hercules modes have this res) je setforgraphicscga ; ... cmp videoax,7 ; ... ja setforgraphicsnocga ; not this one setforgraphicscga: cmp dotmode, 10 ;check for Hercules-specific dotmode 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: 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 ; ... mov cx,2000h ; restore this many words cmp ydots,348 ; (only Hercules modes have this res) jne setforgraphicscganoherc ; ... mov si,0 ; (restore 32K) mov ax,0b000h ; (to here) mov cx,4000h ; (restore this many words) setforgraphicscganoherc: 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,0b800h ; restore the video area mov es,ax ; ES == video addr mov di,0 ; ... push ds ; reset DS to Extraseg temporarily mov ax,extraseg ; ... add ax,1000h ; (plus 64K) mov ds,ax ; ... mov si,4000h ; video data is saved here mov cx,2000h ; restore this many words rep movsw ; restore them. pop ds ; restore DS 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 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 ; ... ret setforgraphics endp setclear proc uses es si di ; clear the screen after setfortext cmp videoax,0 ; check for CGA modes je setclearnocga ; not this one cmp videoax,7 ; ... ja setclearnocga ; not this one setclearcga: call far ptr clscr ; cga mode; normal clear jmp setclearreturn ; we done. setclearnocga: mov ax,0b800h ; clear the video buffer mov es,ax ; ... mov di,0 ; ... mov ax,0 ; to blanks mov cx,8192 ; this many blanks rep stosw ; do it. setclearreturn: ret 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 ; **************** 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 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 cursorrow:word, cursorcol:word mov ax,0200h ; force the cursor mov bx,0 ; in page 0 mov cx,cursorrow ; put this in a register temporarily mov dx,cursorcol ; move to this column mov dh,cl ; move to this row push bp ; some BIOS's don't save this int 10h ; do it. pop bp ; restore the saved register ret movecursor endp ; **************** Function clscr() ******************************** ; Clear the screen (in between text screens) clscr proc call home ; home the cursor mov ax,0600h ; clear the entire screen mov bx,0700h ; to black mov cx,0 ; top left mov dx,1979h ; bottom right push bp ; some BIOS's don't save this int 10h ; do it. pop bp ; restore the saved register ret ; we done. clscr 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 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 call dotread ; read the dot via the approved method mov ah,0 ; clear the high-order bits 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 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 ; ************** Function putblock(xmin, ymin, xmax, ymax, color) ******************* ; write a block of color on the screen ; on the rectangle bounded by (xmin,ymin) and (xmax,ymax) putblock proc uses di si es, xmin:word, ymin:word, xmax:word, ymax:word, xcolor:word mov ax,0a000h ; EGA, VGA, MCGA starts here mov es,ax ; save it here during this routine mov cx,xmin ; x-loop dec cx ; get a running start putblx: inc cx ; next x-dot mov dx,ymin ; y-loop dec dx ; get a running start putbly: inc dx ; next y-dot push cx ; save registers aroud the call push dx ; ... mov ax,xcolor ; ... call dotwrite ; write the dot via the approved method pop dx ; restore registers pop cx ; ... cmp dx,ymax ; done with y-loop? jne putbly ; nope. cmp cx,xmax ; done with x-loop: jne putblx ; nope. call videocleanup ; perform any video cleanup required ret ; we done. putblock endp ; ***************Function out_line(color) ********************* ; 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, ycolor:word mov ax,rowcount ; sanity check: don't proceed cmp ax,ydots ; 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 si,offset ycolor ; 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 ; PUTSTR.asm puts a string directly to video display memory. Called from C by: ; putstring(row, col, attr, string, divider) where ; row, col = row and column to start printing. ; attr = color attribute. ; string = pointer to the null terminated string to print. ; divider = flag to add red column divider at end of string. ; 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 .model medium,c ;----------------------------------------------------------------- .data extrn video_seg:word ;Segment for video memory defined in C code. extrn crtcols:word ;Columns/row extrn crtrows:word ;----------------------------------------------------------------- .code putstring proc uses es di si, row:word, col:word, attr:word, string:word, divider:word mov ax,row ;Get starting row mov cx,crtcols ;Multiply by 2 x bytes/row (char & attr bytes) shl cx,1 imul cx add ax,col ;Add starting column add ax,col ;twice since 2 bytes/char mov di,ax ; di now points to start location in Video segment mov ax,video_seg ;Get Video segment to es mov es,ax mov si,string ; ds:si points to string to print mov ax,attr ;Get color attribute in ah xchg ah,al ; Now print the string B1: lodsb ;Get a char in al cmp al,0 ;End of string? je B2 ;Yes stosw ;No, store char & attribute jmp B1 ;Do next char B2: cmp divider,0 ;Divider requested? je B3 ;No mov ax,04B3h ;Yes, red vertical line stosw B3: ret putstring endp scroll proc uses ds es di si, rows:word, startrow:word ; Get start offset and number of bytes to move. mov ax,crtcols ;Get chars/row mov bx,crtrows ;Get rows/screen sub bx,rows ;Get rows not moved push bx ;Save rows/screen & cols/row push ax push ax mul startrow ;Get chars to start shl ax,1 ;Since char & attr in each pos mov si,ax ;in si mov di,0 ;Move to start of screen pop ax ;Get chars to move mul rows mov cx,ax ;to cx ; Move the rows. mov ax,video_seg ;Get Video segment to es mov es,ax mov ds,ax ;and ds rep movsw ;Move the data (scroll screen) ; Clear the rest of the screen. pop ax ;Get chars/row & rows to clear pop bx mul bx ;Get chars to do mov cx,ax mov ax,0620h ;Clear them rep stosw ; Return to C. ret ;and return to C scroll 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 storedac() **************************** ; Function to Store the dacbox[][] array into VGA, ; called from loaddac() durring initialization. storedac proc push es ; need ES == DS temporarily push ds ; ... pop es ; ... mov ax,1012h ; get the old DAC values mov bx,0 ; (assuming, of course, they exist) mov cx,256 ; ... mov dx,offset dacbox ; ... int 10h ; do it. pop es ; ... ret storedac endp ; *********************** Function loaddac() **************************** ; Function to Load the dacbox[][] array, if it can ; (sets dacbox[0][0] to an invalid '255' if it can't) loaddac proc mov reallyega,0 ; set flag: not an EGA posing as a VGA cmp dotmode,9 ; TARGA 3 June 89 j mclain je loaddacdone cmp f85flag, 0 jne loaddacdone cmp loadPalette,1 ; TARGA/VGA 3 June 89 j mclain jne normalLoadDac call storedac jmp short loaddacdone normalLoadDac: mov dacbox,255 ; a flag value to detect invalid DAC cmp debugflag,16 ; pretend we're not a VGA? je loaddacdebug ; yup. push es ; need ES == DS temporarily 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 ; some older BIOSes don't save this int 10h ; do it. pop bp ; restore registers pop es ; ... loaddacdebug: cmp dacbox,255 ; did it work? do we have a VGA? jne loaddacdone ; yup. cmp colors,16 ; are we using 16 or more colors? jb loaddacdone ; nope. forget it. cmp ydots,350 ; 640x350 range? 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: 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 dacbox,255 ; 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 ; ... mov cx, rstep ; loop through the rotate "rstep" times stepDAC: push cx ; save the loop counter for a tad cmp direction,0 ; just replace it? je newDAC ; yup. cmp direction,1 ; rotate upwards? jne short downDAC ; nope. downwards cld ; set the direction mov si,offset dacbox+3 ; set up the rotate mov di,offset dacbox+768 ; ... mov cx,3 ; ... rep movsb ; rotate it. mov si,offset dacbox+6 ; set up the rotate mov di,offset dacbox+3 ; ... mov cx,765 ; ... rep movsb ; rotate it. jmp short newDAC ; set the new DAC downDAC: std ; set the direction mov si,offset dacbox+767 ; set up the rotate mov di,offset dacbox+770 ; ... mov cx,765 ; ... rep movsb ; rotate it. mov si,offset dacbox+770 ; set up the rotate mov di,offset dacbox+5 ; ... mov cx,3 ; ... rep movsb ; rotate it. newDAC: cld ; set the direction pop cx ; restore the loop counter loop stepDAC ; and loop until done. cmp f85flag, 0 ; if 8514a then update pallette je spindoit jmp spin8514 spindoit: 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 ; ... mov ax,1012h ; update the DAC int 10h ; do it. 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 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 end