BBS 1/BBS#1.iso/document/vgadoc.arj/ATI.DOC

Text File | 1991-12-05 | 12KB | 323 lines

   ATI Technologies Super VGA Chip Sets.

    Board               18810 Dot    ROM BIOS
    Version   Chip      Clock Chip   Label
      V3   18800 rev 1     no          V3M
      V4   18800 rev 2     no          V4M    (18800-1)
      V5   18800 rev 2    yes          V5M    (18800-1)
       ?   28800                              VGA Wonder+


    ATI Prism Elite uses Trident 8800CS chips.



       3C0h (R/W):  Palette index register
       bit 4-5  Mode 67h Palette
                 Value   Pixel=0    1      2            3
                   0       Black  White  Grey      Bright White
                   1       Black  Green  Red       Yellow
                   2       Black  Cyan   Red       White
                   3       Black  Cyan   Magenta   White


       1CEh index B0h (R/W): ATI Register 0
         bit 0  Reserved
             3  Enable 8 CRT accesses for each CPU access
             6  Hercules 300 line emulation
             7  Reserved
       1,2,4,5  DRAM timing

       1CEh index B1h (R/W): EGA Compatability and Double Scanning Enable
         bit 0  Force all I/O addresses to be EGA compatible if set
             1  Force all registers to be EGA compatible if set
             2  General purpose read/write
           3-5  Double scanning/3 of 4 scanning enable
                 1: Enable double scanning in graphics mode
                 2: Enable 3 of 4 scanning in graphics mode
                 5: Enable double scanning in text mode
                 6: Enable 3 of 4 scanning in text mode
             6  Divide vertical timing parameters by 2 if set
             7  Reserved

       1CEh index B2h (R/W): Bank Register
         bit 0  (rev 1) Enable interlace if set
           1-4  (rev 1) Bank no. in 64 chunks
             5  (rev 1) Enable internal DIP switch settings (EGA mode)
             6  (rev 1) External clock select
             7  (rev 1) Reserved

             0  (rev 2+) Reserved
           1-3  (rev 2+) Write/Single bank no
             4  (rev 2+) Reserved
           5-7  (rev 2+) Read Bank no

       1CEh index B3h (R/W): ATI Register 3
         bit 0  EEPROM data input
             1  EEPROM clock source
             2  Enable EEPROM interface
             3  EEPROM chip select
             4  (rev 1)  Enable PS/2 decoding
                (rev 2+) Disable memory beyond 256K
             5  Enable 16bit operation
             6  (rev 2+)  Enable 1024x768 16 color planar pixel mode
             7  (rev 2+)  Enable double scanning for 200 line modes
       Note: This register should not be modified on revision 1 chips.

       1CEh index B4h (R/W): ATI Register 4
         bit 0  Enable CGA emulation
             1  Enable Hercules emulation
             2  Lock CR90-94,CR97
             3  Lock vertical timing registers
             4  Lock cursor start and end
             5  Lock CR80-86 and CR140-144
             6  Lock CR0-7 instead of CR117
             7  Override locking of CR117

       1CEh index B5h (R/W): ATI Register 5
         bit 0  Select display enable as blanking signal
             1  Invert blanking signal polarity
             2  Enable display signal skew
             3  Select Map 3 as programmable character generator
             4  Enable 8 simultaneous fonts if set
                Background is then always 0, and bit 4-7 of an attribute
                selects the font.
             5  Disable Cursor Blinking if set
             6  Enable CGA Cursor Emulation if set
                Adds 5 to the cursor start and end registers.
             7  Reserved

       1CEh index B6h (R/W): ATI Register 6
         bit 0  Reserved
             1  Enable 640x400 Hercules emulation
             2  Reserved
             3  Select 4 color high res modes
             4  Select 16 color high res modes
             5  Enable vertical interrupts
             6  Select composite sync for output
             7  Disable blanking screen blank in CGA and Hercules
                emulation

       1CEh index B7h (R/W): ATI Register 7
       bit 0-7  Reserved

       1CEh index B8h (R/W): ATI Register 8
         bit 0  Lock Palette registers in Attribute Controller
             1  Lock Overscan register in Attributre Controller
             2  Lock All VGA registers except CRTC start and end
             3  Lock write to 3C2h
             4  Lock horizontal sync polarity
             5  Lock vertical sync polarity
           6-7  Clock divider

       1CEh index B9h (R/W): ATI Register 9
         bit 0  Clock select
             1  Select input to clock chip
           2-3  RAM address space
           4-5  Wait cycles for 16 bit ROM access
             6  Set horizontal total = register value +2 (vs +5)
             7  Lock Line Compare register

       1CEh index BAh (R/W): ATI Register A
       bit 0-2  Delay chain timing compensation
             3  Disable secondary Red output (for RGB monitors)
             4  Enable EGA color simulation for RGB monitors
             5  Enable monochrome gray scale circuit
             6  reserved
             7  Delay chain resolution compensation

       1CEh index BBh (R/W): Input Status Register
       bit 0-3  Monitor Type:
                 0: EGA
                 1: PS/2 Analog Monochrome
                 2: TTL Monochrome
                 3: PS/2 Color
                 4: RGB Color
                 5: MultiSync
                 7: PS/2 8514
                 8: Seiko 1430
                 9: NEC Multisync 2A
                 A: Crystalscan 860/Tatung 1439
                 B: NEC Multisync 3D
                 C: TVM 3M
                 D: NEC MultiSync XL
                 E: TVM 2A
                 F: TVM 3A
             4  reserved
             5  512Kbytes if set, 256K else
           6-7  Reserved

       1CEh index BCh (R/W): ATI Register C
       bit 0-7  reserved

       1CEh index BDh (R/W): ATI Register D
       bit 0-3  Reserved
           4-7  EGA switch settings

       1CEh index BEh (R/W): ATI Register E        (rev 2+)
         bit 0  Unlock Vertical Display End register of the
                CRT Controller
             1  Enable interlace mode
             2  Select internal EGA DIP switch value
             3  Dual bank mode if set, single else
           4-5  Reserved
             6  Enable 1024x768 16 color mode
             7  Enable 1024x768 4 color mode


       3C0h (R/W):  Palette index register
       bit 4-5  Mode 67h Palette
                 Value   Pixel=0    1      2            3
                   0       Black  White  Grey      Bright White
                   1       Black  Green  Red       Yellow
                   2       Black  Cyan   Red       White
                   3       Black  Cyan   Magenta   White

  Note:  The ATI chips handles the indexed registers sligtly differently
         from other VGA chips, as the index register must be written before
         each read or write of the associated data registyer.



  Bank Switching

    Bank switching can use either one single bank register or two
    seperate read and write bank registers (18800-2 and 28800 Only).
    Banks map to 64k boundries.

  Reserved locations:

    $C000:$10   2 bytes   ATI Register (usually $1CE).
    $C000:$31   9 bytes   '761295520' ID's ATI product
    $C000:$40   2 bytes   '31' ID's ATI Super VGA
                          '32' = ATI EGA Wonder 800+
                          '22' = ATI EGA Wonder
    $C000:$42   1 byte    Bit 0  Can switch between 8 and 16 bit ROM if set
                              1  Mouseport present if set
                              2  Non-intelace if set
                              3  Microchannel if set, PC/AT else
                              4  Use clock chip if set
                              7  Use C000:0000 to D000:FFFF with 16 bit ROM if set
    $C000:$43   1 byte    Gate revision. '1' = Version 1,
                             '2' = version 2, '3' = version 2 with VRAM
    $C000:$4C   1 byte    Major Bios version
    $C000:$4D   1 byte    Minor Bios version




  ID ATI Super VGA Chip Set

    s[0]:=#9;
    move(mem[$c000:$31],s[1],9);
    if s='761295520' then ATI card
      if memw[$c000:$40]=$3331  then ATI_Super_VGA





  ID Which ATI Super VGA Chip

    rp.ah:=12h
    rp.bx:=5506h
    rp.al:=55h
    rp.bp:=FFFFh
    rp.si:=0h
    intr($10,rp);
    if rp.bp=FFFFh then ATI_rev1 else ATI_rev>=2



  Video Modes:
    23h  T   132   25  16  (8x14)
    27h  T   132   25   2  (8x14)
    33h  T   132   44  16  (8x8)
    37h  T   132   44   2  (8x8)
    54h  G   800  600  16  planar
    55h  G  1024  768  16  planar   18800 rev 2 or later
    58h  T    80   33      (8x8)
    5Bh  T    80   30      (8x16)
    61h  G   640  400 256  packed
    62h  G   640  480 256  packed
    63h  G   800  600 256  packed
    64h  G  1024  768 256  packed   VGA Wonder +
    65h  G  1024  768  16  packed   ****  See note
    67h  G  1024  768   4  planar   ****  See note
    6Ah  G   800  600  16           Undocumented ??


    ATI enhanced Graphics modes do NOT support INT 10h with AH=
      01h..0Eh or 11h or 13h.


    Mode 65h  1024x768 16 color
      4 bits per pixel packed mode
      Even pixel is in bits 0-3 of the byte, odd in bits 4-7.

    Mode 67h  1024x768  4 color
      2 bits per pixel planar mode
      Even pixels are in plane 2&3, odd pixels in plane 0&1.


  Bios extensions:

----------1012--BH55-------------------------
INT 10 - VIDEO - ALTERNATE FUNC SELECT (ATI,Tatung,Taxan) - ENHANCED FEATURES
        AH = 12h
        BH = 55h
        BL = subfunction
              00h disabled enhanced features
              01h enable enhanced features
              02h get status
Return:           AL = status flags
                       bit    3  set if enhanced features enabled
                       bits 7-5  monitor type
                                 000 PS/2 mono
                                 001 PS/2 color
                                 010 multi-sync
                                 011 Taxan 650 25kHz
                                 100 RGB
                                 101 mono
                                 110 EGA
                                 111 Compaq internal
              03h disable register trapping (CGA emulation)
              04h enable register trapping
              05h program mode described by table at ES:BP
              06h get mode table
                  AL = video mode
                  BP = FFFFh  (Known illegal value).
                  SI = 0000h  (Known illegal value).
Return:           ES:BP -> table suitable for mode AL (and subfnc BL=05h)
                  BP = FFFFh on error

Format of ATI VGA Wonder video mode table:
Offset  Size     Description
 00h    BYTE     number of columns
 01h    BYTE     maximum row (number of rows - 1)
 02h    BYTE     scan lines per row
 03h    WORD     video buffer size in bytes
 05h   4 BYTEs   values for Sequencer registers 1-4
 09h    BYTE         value for Miscellaneous Output register
 0Ah   25 BYTEs      values for CRTC registers 00h-18h
                  00h horizontal total size (chars)
                  01h horizontal displayed (chars)
                  02h horizontal sync position (chars)
                  03h horizontal sync width (chars)
                  04h vertical total size (char rows)
                  05h vertical total adjust (scan lines)
                  06h vertical displayed (char rows)
                  07h vertical sync position (char rows)
                  08h interlace mode
                  09h max scan line in row
                  0Ah cursor start scan line
                  0Bh cursor end scan line
                  0Ch screen memory start (high)
                  0Dh screen memory start (low)
                  0Eh cursor address (high)
                  0Fh cursor address (low)
                  10h light pen (high)
                  11h light pen (low)
 23h   20 BYTEs      default palette (values for Attribute Controller regs 00h-13h)
 37h   9 BYTEs       values for Graphics Controller registers 00h-08h