Internet Info 1994 March/Internet Info CD-ROM (Walnut Creek) (March 1994).iso/standards/VGA/video7.txt

Text File | 1993-07-15 | 12.5 KB | 392 lines

  Video 7 Super VGA.
  Now Headland Technologies

    Earlier V7/Headland boards use Chips&Technologies and Cirrus chips.

    Board:    Chip:
    V7VRAM    HT-208
    V71024i   HT-208
      ?       HT-216





 100h (R/W?): Microchannel ID low
 bit 0-7  Card ID bit 0-7

 101h (R/W?): Microchannel ID high
 bit 0-7  Card ID bit 8-15

 102h (R/W): Alt Video Subsystem Enable
 bit 0  Enable Video if set
    Must be armed by 3C4h index 0FCh bit 7
    or in setup mode (46E8h bit4) to change.

 3C2h (W): Misc Output register
 bit 5  Bit 1 of Bank no.
 Note:  This register can be read at 3CCh.

 3C3h (R/W): Video Subsystem Enable
 bit 0  Enable Microchannel Video if set
    Must be armed by 3C4h index 0FCh bit 7 to change.

 3C4h index  6  (R/W): Extension Control
 bit   0  (Read Only) Extensions enabled if set
 bit 0-7  (Write Only) 0EAh Enables extensions, 0AEh disables.

 3C4h index  7  (R/W): Reset Horizontal Character Counter

 3C4h index 80h (R/W): Test

 3C4h index 81h (R/W): Test

 3C4h index 82h (R/W): Test

 3C4h index 83h (R/W): Attribute Control Index

 3C4h index 8Eh-8Fh (R): Chip Version
 bit 0-7  Chip version:
        80h-FFh: VEGA VGA Chip,
        70h: V7VGA chip revision 1,2 or 3
        71h: V7VGA chip revision 4
        50h-59h: V7VGA Version 5
        41h-49h: 1024i.

 3C4h index 94h (R/W): Pointer Pattern Address
 bit 0-7  Bit 6-13 of the start address of the Pointer Pattern

 3C4h index 9Ch (R/W): Pointer Horizontal Position High
 bit 0-2  Bit 8-10 of the X coordinate of the Pointer

 3C4h index 9Dh (R/W): Pointer Horizontal Position Low
 bit 0-7  Bit 0-7 of the X coordinate of the Pointer

 3C4h index 9Eh (R/W): Pointer Vertical Position High
 bit 0-1  Bit 8-9 of the Y coordinate of the Pointer

 3C4h index 9Fh (R/W): Pointer Vertical Position Low
 bit 0-7  Bit 0-7 of the Y coordinate of the Pointer

 3C4h index A0h (R/W): GC Memory Latch 0
 bit 0-7  Plane 0 Memory Latch Data

 3C4h index A1h (R/W): GC Memory Latch 1
 bit 0-7  Plane 1 Memory Latch Data

 3C4h index A2h (R/W): GC Memory Latch 2
 bit 0-7  Plane 2 Memory Latch Data

 3C4h index A3h (R/W): GC Memory Latch 3
 bit 0-7  Plane 3 Memory Latch Data

 3C4h index A4h (R/W): Clock Select
 bit 2-4  0: 25.175 MHz
      1: 28.322 MHz
      2: 30.000 MHz
      3: 32.514 MHz
      4: 34.000 MHz
      5: 36.000 MHz
      6: 38.000 MHz
      7: 40.000 MHz

 3C4h index A5h (R/W): Cursor Attributes
 bit 0  Cursor blink enabled if clear
     3  Text Cursor Mode is XOR if set, Replace if clear
     7  Graphics Cursor Enabled if set

 3C4h index B0h-BFh (R/W): Scratch Registers
 bit 0-7  Scratch

 3C4h index E0h (R/W): Miscellaneous Control      (Version 4+)
 bit 0-3 Reserved
       4  Interlaced
     5-6  Reserved
       7  Enables Split Bank Mode

 3C4h index E8h (R/W): Single/Write Bank Register (Version 4+)
 bit 4-7  Single/Write Bank no.

 3C4h index E9h (R/W): Read Bank Register         (Version 4+)
 bit 4-7  Read Bank no.
      Only Active if Split mode enabled (3C4h index E0h bit 7)

 3C4h index EAh (W): Switch Strobe
 Note:  A write to this register copies the switch positions to
    the Switch Readback Register (3C4h index F7h).

 3C4h index EBh (R/W): Emulation Control

 3C4h index ECh (R/W): Foreground Latch 0
 bit 0-7  Foreground Latch for plane 0. When in Dither Foreground mode
      (3C4h index FEh bit 2-3 = 2) the data in this register
      replaces the data written from the processor.

 3C4h index EDh (R/W): Foreground Latch 1
 bit 0-7  Foreground Latch for plane 1.

 3C4h index EEh (R/W): Foreground Latch 2
 bit 0-7  Foreground Latch for plane 2.

 3C4h index EFh (R/W): Foreground Latch 3
 bit 0-7  Foreground Latch for plane 3.

 3C4h index F0h (R/W): Fast Foreground Latch Load
 bit 0-7  The Foreground Latches (3C4h index ECh to EFh) for the four
      memory planes can be loaded by writing to this register.
      The writes will cycle through planes 0-3.
      A read will restart at plane 0.

 3C4h index F1h (R/W): Fast Latch Load State
 bit 0-1  Background Latch Load State. Determines which of the
      four memory latches will be loaded by a write to 3C4h
      index F2h. Each write to index F2h will increment this
      value and each read from index F2h will reset it to 0.
     2-3  Unused
     4-5  Foreground Latch Load State. Determines which of the
      four Foreground latches (3C4h index ECh to EFh) will
      be loaded by the next write to 3C4h index F0h.
      Each write to index F0h will increment this value
      and each read from index F0h will reset it to 0.
     6-7  Unused

 3C4h index F2h (R/W): Fast Background Latch Load
 bit 0-7  The Memory Data Latches for the four memory planes can be
      loaded by writing to this register. The writes will cycle
      through planes 0-3. A read will restart at plane 0.

 3C4h index F3h (R/W): Masked Write Control   (Only with VRAM)
 bit 0  Enables Masked Writes if set
     1  If set rotated CPU byte is used as WriteMask, else
    Masked Write Mask register is used.

 3C4h index F4h (R/W): Masked Write Mask      (Only with VRAM)
 bit 0-7  If Masked Writes enabled by 3C4h index F3h bit 0
      Only the bits set here will be updated in Video memory.

 3C4h index F5h (R/W): Foreground/Background Pattern
 bit 0-7

 3C4h index F6h (R/W): 1MB RAM Bank Select
 bit 0-1  Write Bank no bit 2-3 if 256 color, bit 0-1 else.
     2-3  Read Bank no bit 2-3 if 256 color, bit 0-1 else.
     4-5  CRTC Bank (Address bit 16-17)
       6  Display address Wraps Around at bank boundary if set
       7  Split Screen Wraps around at bank boundary if set

 3C4h index F7h (R/W): Switch Readback
 bit 0-7  Switch positions as read by the last write to the Switch
      Strobe Register (3C4h index EAh)

 3C4h index F8h (R/W): Extended Clock Control
 bit 5-7  Clock Source:
        0: 25.175 MHz
        1: 28.322 MHz
        2: 30.000 MHz
        3: 32.514 MHz
        4: 34.000 MHz
        5: 36.000 MHz
        6: 38.000 MHz
        7: 40.000 MHz
 Note: depending on mode and other bits in this register other
       values may be selected.

 3C4h index F9h (R/W): Page Select
 bit 0  bit 16 of Video Memory Address. (Only needed if in a
    256 color mode, and 3C4h index FCh bit 1-2 = 1).

 3C4h index FAh (R/W): Extended Foreground Color
 bit 0-3  Foreground expansion color.
      Bit 0 is written to plane 0 et cetera.

 3C4h index FBh (R/W): Extended Background Color
 bit 0-3  Background expansion color
      Bit 0 is written to plane 0 et cetera.

 3C4h index FCh (R/W): Compatibility Control
 bit 0  Enable Extended Attribute functions if set
    Extended attributes allows underlining using a mask
    in plane 3 for each character.
     1  256-Color Paging Enabled if set.
     2  256-Color 64K/128K paging Select.
    128K pages if set, 64K pages else.
   3-6  Reserved.
     7  If set allows enabling VGA via 102h bit 0 or 3C3h bit 0.

 3C4h index FDh (R/W): Extended Timing Select

 3C4h index FEh (R/W): Foreground/Background Control
 bit 0  Unused
     1  Foreground/background source select
    Source is CPU data if set, 3C4h index F5h else.
   2-3  Foreground/background mode select
      0  Standard VGA mode
      1  Color Expansion Mode
         A monochrome bitmap is expanded to color.
         For each bit of of data written from the processor
         a zero bit causes the background color (3C4h index FBh)
         to be written in the corresponding pixel, and a 1 bit
         causes the foreground color (3C4h index FAh) to be written.
      2  Dithered foreground. The data from the processor is
         replaced by data from four Foreground Latches (3C4h index
         ECh to EFh). The normal VGA Read Latches function as normal.
      3  Invalid
    4-7  Unused

 3C4h index FFh (R/W): 16 bit Interface Control
 bit 0  16 bit memory if set
     1  16 bit I/O if set
     2  Fast Write Enabled if set
     3  16 bit ROM access if set
     4  Enable bank selection
   5-6  Cursor Pattern Page Select
     7  (Read only) Card in 8 or 16 bit slot

 3d4h index 1Fh (R): Identification register
 bit 0-7  Returns bit 0-7 of the Start Address High Register
      (3d4h index 0Ch) xored with 0EAh.

 3d4h index 22h (R): Graphics Controller Data Latch
 bit 0-7  Data from one of 4 bit-planes selected through the
      RMS field of the Read Map Select Register (3CEh index 4)

 3d4h index 24h (R): Graphics Controller Data
 bit 0-4  Attribute Index. Same as 3C1 bit 0-4.
       5  Palette source.  Same as 3C1h bit 5
       7  Does the Attribute Controller point to Index or Data .

 3d4h index 30h-3Fh (W): Clear Vertical Display
 bit 0  if set speeds up video memory access by increasing the
    vertical Retrace Period.


 46E8h (W): Rom Map & Video Subsystem
 bit 0-2  Enable VGA PC/AT
       3  Enable VGA PC/AT if set
       4  Enter VGA Setup Mode if set
      In Setup Mode only registers 102h, 3C3h and 46E8h
      are active.


    4BC4h,4BC5 used.


  Bank Select:

    Two methods exists:

    All models can use method 1:
      For 2 and 4 color modes bit 16 of the address is in 3C2h bit 5.

      For 16 color modes separate read and write banks can be selected
      through 3C4h index F6h.

      For 256 color modes the bank fields in 3C4h index F6h select
      bit 18&19 of the video memory address.
      Bit 16 is selected through 3C4h index F9h bit 0.
      Bit 17 is selected through Miscellaneous Output Register
         (3C2h/3CCh bit 5).
      Bit 16&17 are shared by read and write operations.

    For Version 5 and above separate bank registers are available.
    Both read and write banks exists.


  ID Video 7 VGA Chip Set:

    vio($6F00);
    if rp.bx=$5637 then
    begin
      vio($6F07);
      case rp.bl of
    $80..$FF: VEGA_VGA;
    $70..$7F:V7VGA_FASTWRITE/VRAM; {Revision 3}
    $50..$59:V7VGA_Version5;
    $41..$49:Video7_1024i;
      end;
    end;


  Video Modes:
    40h  T   80   43   2
    41h  T  132   25   2
    42h  T  132   43   2
    43h  T   80   60  16
    44h  T  100   60  16
    45h  T  132   28  16

    60h  G  752  410  16 planar
    61h  G  720  540  16 planar
    62h  G  800  600  16 planar
    63h  G 1024  768   2 planar
    64h  G 1024  768   4 planar odd/even
    65h  G 1024  768  16 planar
    66h  G  640  400 256 packed    V1024 w/VRAM
    67h  G  640  480 256 packed
    68h  G  720  540 256 packed    VRAM only
    69h  G  800  600 256 packed    VRAM only
    6Ah  G 1024  768 256 packed


  BIOS extensions:

----------106F00-----------------------------
INT 10 - VIDEO - INSTALLATION CHECK (Video7 VGA,VEGA VGA)
    AX = 6F00h
Return: BX = 5637h ('V7') indicates Video7 VGA/VEGA VGA extensions are present
----------106F01-----------------------------
INT 10 - VIDEO - GET MONITOR INFO (Video7 VGA,VEGA VGA)
    AX = 6F01h
Return: AL = monitor type code (VEGA VGA only)
    AH = status register information
         bit  0 = display enable
              0 = display enabled
              1 = vertical or horizontal retrace in progress
         bit  1 = light pen flip flop set
         bit  2 = light pen switch activated
         bit  3 = vertical retrace if set
         bit  4 = monitor resolution
              0 = high resolution (>200 lines)
              1 = low resolution (<=200 lines)
         bit  5 = display type
              0 = color
              1 = monochrome
         bits6,7= diagnostic bits
Note: bits 0-3 are the same as the EGA/VGA status register bits 0-3
----------106F04-----------------------------
INT 10 - VIDEO - GET MODE AND SCREEN RESOLUTION (Video7 VGA, VEGA VGA)
    AX = 6F04h
Return: AL = current video mode (see AX=6F05h)
    BX = horizontal columns (text) or pixels (graphics)
    CX = vertical columns (text) or pixels (graphics)
SeeAlso: AX=6F05h
----------106F05-----------------------------
INT 10 - VIDEO - SET VIDEO MODE (Video7 VGA, VEGA EXTENDED EGA/VGA)
    AX = 6F05h
    BL = mode (see below)
SeeAlso: AH=00h,AX=0070h

Values for video mode:
 00h-13h = standard IBM modes (see AH=00h)
 40h-6Ah = see table above.

SeeAlso: AH=00h,AX=0070h,AX=007Eh,AX=6F04h
----------106F06-----------------------------
INT 10 - VIDEO - SELECT AUTOSWITCH MODE (V7VGA,VEGA VGA)
    AX = 6F06h
    BL = Autoswitch mode select
         00h select EGA/VGA-only modes
         01h select Autoswitched VGA/EGA/CGA/MGA modes
         02h select 'bootup' CGA/MGA modes
BH = enable/disable (00h enable, 01h = disable selection)
----------106F07-----------------------------
INT 10 - VIDEO - GET VIDEO MEMORY CONFIGURATION (V7VGA,VEGA VGA)
    AX = 6F07h
Return: AL = 6Fh
    AH = bits 0-6 = number of 256K blocks of video memory
         bit 7    = DRAM/VRAM (0: DRAM, 1: VRAM)
    BH = chip revision (SR8F) (S/C Chip in VEGA VGA)
    BL = chip revision (SR8E) (G/A Chip in VEGA VGA)
    CX = 0000h
SeeAlso: AH=12h/BL=10h