oak.txt

比较详尽的VGA端口寄存器的文档

         first (low bits) and the red last, if clear red comes first.
    5-6  Bits/pixel. 0: 8bpp, 1: 16bpp, 2: 24bpp, 3: 32bpp

3DEh index 80h W(R/W):  HC/HW Horizontal Position Start
3DEh index 82h W(R/W):  HC/HW Vertical Position Start
3DEh index 84h (R/W):  HC Horizontal Preset/HW Width Low
bit 0-5  (HC)
    0-7  (HW) Low 8bits of the HW width. Upper bits are in index 85h

3DEh index 85h (R/W):  HW Width High
bit 0-?  High bits of the HW width. Low bits are in index 84h. This value is
         the number of doublewords (4bytes) in each line.

3DEh index 86h (R/W):  HC Vertical Preset Low/HW Height Low
3DEh index 87h (R/W):  HW Height High
3DEh index 88h 3(R/W):  HC Start Address
3DEh index 8Ch 4(R/W):  HC Color 0
bit 0-31  Cursor color 0. Same format as the current display

3DEh index 90h 4(R/W):  HC Color 1
bit 0-31  Cursor color 1. Same format as the current display

3DEh index 94h (R/W):  HC Control Register
bit   0  Enable Hardware Cursor (HC) if set
      1  HC display is over overscan if set, under if clear
      2  HC Data format. Motorola if set, Intel if clear
      3  HC Blink enabled if set
    4-5  Blink Rate. 0: 4frames on+off, 1: 8f, 2: 16f, 3: 32f

3DEh index 96h (R/W):  HW Control
bit   0  Select Hardware Window (HW) or Hardware Cursor (HC). 0: HC, 1: HW
    1-2  Horizontal Scaling Factor. 0: None, 1: /2, 2: /4, 3: /8
    3-4  Vertical Scaling Factor. 0: None, 1: /2, 2: /4, 3: /8
      5  Select odd/even lines for scaling. 0: even, 1: odd
      6  YUV or RGB for scaling. 0: data from Multimediaport is YUV, 1: RGB
      7  Enable Mask Map for Multimedia Port

3DEh index 98h 3(R/W):  HW Mask Map Start
3DEh index 9Ch 3(R/W):  HW Start Address
3DEh index 9Fh (R/W):  HW Address Offset

3DEh index F0h (R/W):  Scratch Register 0
3DEh index F1h (R/W):  Scratch Register 1
3DEh index F2h (R/W):  Scratch Register 2
3DEh index F3h (R/W):  Scratch Register 3
3DEh index F4h (R/W):  Scratch Register 4
3DEh index F5h (R/W):  Scratch Register 5
3DEh index F6h (R/W):  Scratch Register 6
3DEh index F7h (R/W):  Scratch Register 7

2x00h W(R):  Vendor ID
bit 0-15  104Eh for Oak

2x02h W(R):  Device ID
bit 0-15  0107h for the Oak-107

2x04h W(R/W):  System Bus Command Register
bit    0  I/O Space. If set the device is allowed to respond to I/O accesses.
       1  Memory Space. If set the device is allowed to respond to memory
          accesses.
       3  Special Cycle. If set the device is allowed to monitor special
          cycles.
       5  VGA Palette Snoop. Clear for normal DAC  operation, set to enable
          special DAC snoop mode where the DAC does not respond to writes.
       6  Parity Error. If set the device responds to parity errors, if clear
          ignores them.
       7  Wait Cycle Control. If set enables address/data stepping.
       8  System Error Driver. If set the Error driver reports address parity
          errors, if clear it is disconnected.
       9  Back to Back Cycle. If set there is no delay between bus cycles.

2x??h W(R):  System Bus State
bit    7  (R) Fast back-to-back. Fast back-to-back supported if set
       8  Bus Master
    9-10  (R) Device Select Timing. Timing of DEVSEL#. 0: fast, 1: medium,
            2: slow
      11  Device Target-abort. Set if the VGA issues a target abort
      12  Received Target-abort. Set if the VGA as master receives a target
          abort.
      13  Master Abort Status. Set if the VGA as master issues a master abort.

2x08h (R):  Revision ID
2x??h D():  Class Code Register
bit 0-23  0 for non-VGA devices, 30000h for VGA compatible devices ??

2x??h (R):  Programming Interface
2x??h (R/W):  Cache Line Size
2x??h (R):  Header Type
2x??h (R/W):  Built-In Self Test
2x10h D(R/W):  Memory Mapped I/O Base Address
bit    0  (R) Memory or I/O. 0: Memory mapped, 1: I/O mapped
     1-2  (R) Locatable area. 0: Anywhere in 32bit address space, 1: Below
           1MB, 2: anywhere in 64bit address space.
       3  (R) Pre-fetchable. Set if memory is cacheable, clear if not.
     4-7  (R) Address space size. 0: 256 bytes
    8-31  Memory-Mapped I/O Base. Upper 24bits of the base address

2x14h D(R/W):  Graphics Memory Base Address
bit    0  (R) Memory or I/O. 0: Memory mapped, 1: I/O mapped
     1-2  (R) Locatable area.  0: Anywhere in 32bit address space, 1: Below
           1MB, 2: anywhere in 64bit address space.
       3  (R) Pre-fetchable. Set if memory is cacheable, clear if not.
    4-19  (R) Address space size. 0: >= 1MB
   20-22  (PCI) (R) Address block size. Always 0
   20-22  (VL,ISA) Address block size. Bits 20-22 of the Base address
   23-31  Base Address. Upper 9 bits of the base address.

2x??h D(R/W):  Extended I/O Base Address
bit    0  (R) Memory or I/O. 0: Memory mapped, 1: I/O mapped
       3  (R) Pre-fetchable. Set if memory is cacheable, clear if not.
     4-7  (R) Address space size. 0: 256bytes
    8-31  Base Address. Upper 24 bits of the base address.

2x30h (R/W):  BIOS ROM Base Address
bit    0  (R/W) BIOS ROM Decode enabled if set
   11-14  (R) ROM BIOS Min Size. If clear ROM BIOS is min. 32K
   15-17  ROM BIOS size. Bits 15-17 of the base address. Depending on the size
          of the ROM (see Configuration Register 2 - 3DEh index 8 bits 3-4)
          some of these bits may be Read only and 0.
             3DEh index 8 bits 3-4:     Bit15    Bit16    Bit17    ROM Size:
                           0             R/W      R/W      R/W        32K
                           1             R/W      R/W      R(0)       64K
                           2             R/W      R(0)     R(0)      128K
                           3             R(0)     R(0)     R(0)      256K
   18-31  ROM BIOS Address. Upper 14 bits of the base address.

2x3Ch (R/W):  Interrupt Line
2x??h (R):  Interrupt Pin
2x??h (R):  Minimum Grant
2x??h (R):  Maximum Latency



M+10h (R/W):  Co-Processor Status
bit 0-1  (R) Map that needs data next. 0: Pattern, 1: Mask, 2: Source, 3: Dest
      2  If set the map writing, if clear reading
      3  (R) Map Status Valid
      4  If set increase address for next access, if clear reset to map start
      5  If set advance to next line, if clear stay on current line
      7  (R) Co-Processor busy if set

M+11h (R/W):  Co-Processor Control
bit   0  Select CINT interrupt source. VGA interrupt or Co-Processor interrupt
      1  Enable Master Mode. 0: CPU assisted, 1: Bus Master
      4  Interrupt Status. Interrupt pending if set. Write 0 to clear
      5  Terminate Co-Processor operation if set
      6  Enable Turbo Co-Processor data path. If set removes extra datapath
         delay (1 clock).

M+12h (R/W):  Pixel Map Select
M+14h D(R/W):  Pixel Map n Base
M+18h W(R/W):  Pixel Map n Width
M+1Ah W(R/W):  Pixel Map n Height
M+1Ch (R/W):  Pixel Map n Format
bit 0-2  Bits per pixel. 0: 1bpp, 3: 8bpp, 4: 16bpp, 5: 32bpp
      3  Set for Motorola format, clear for Intel format
      7  Set if the map is in system memory, clear if in video memory

M+20h W(R/W):  Bresenham Error Term
M+24h W(R/W):  Bresenham K1
M+28h W(R/W):  Bresenham K2
M+2Ch D(R/W):  Direction Steps
M+48h (R/W):  ROP
M+4Ah (R/W):  Destination Color Compare Condition
bit 0-2  Condition.
           0:  Always true (disable update)
           2:  Dest == color
           4:  Dest != color
           6:  Always false (enable update)

M+4Ch D(R/W):  Destination Color Compare Value
M+50h D(R/W):  Pixel Bit Mask
M+58h D(R/W):  Foreground Color
M+5Ch D(R/W):  Background Color
M+60h W(R/W):  Operation Dimension 1
M+62h W(R/W):  Operation Dimension 2
M+6Ch W(R/W):  Mask Map Origin X Offset
M+6Eh W(R/W):  Mask Map Origin Y Offset
M+70h W(R/W):  Source X Pointer
M+72h W(R/W):  Source Y Pointer
M+74h W(R/W):  Pattern X Pointer
M+76h W(R/W):  Pattern Y Pointer
M+78h W(R/W):  Destination X Pointer
M+7Ah W(R/W):  Destination Y Pointer
M+7Ch D(R/W):  Pixel Operations Register
bit  0-2  Direction
     4-5  Drawing Mode
     6-7  Mask Pixel Map
   12-15  Pattern Pixel Map
   16-19  Destination Pixel Map
   20-23  Source Pixel Map
   24-27  Co-Processor Function Control
   28-29  Foreground Source
   30-31  Background Source


Note: the co-processor is clearly modeled on the IBM XGA.

  ID Oak VGA:

  if testinx2($3DE,$D,$38) then
  begin
    { We have an OAK }
    if testreg2($3DE,$23,$1F) then
      if (rdinx($3DE,0) and 2)=0 then _OAK_087
                                 else _OAK_083
    else
      case inp($3DE) div 32 of
        0:_OAK_037C
        2:_OAK_067
        5:_OAK_077
        7:_OAK_057
      end;
  end;


  Modes:

  (OTI 067/077/087)

  4Eh  T    80   60  16  (8x8)      Not all 067's
  4Fh  T   132   60  16  (8x8)
  50h  T   132   25  16  (8x14)
  51h  T   132   43  16  (8x8)
  52h  G   800  600  16  PL4
  53h  G   640  480 256  P8
  54h  G   800  600 256  P8
  55h  G  1024  768   4  PL1/2?
  56h  G  1024  768  16  PL4
  57h  G   768 1024   4  ??
  58h  G  1280 1024  16  PL4
  59h  G  1024  768 256  P8     OTI-077/87 only
  5Ah  G   640  480 64k  P16    OTI-077 w/Sierra
  5Bh  G   640  400 32k  P15    OTI-077 w/Sierra
  5Ch  G   640  480 32k  P15    OTI-077 w/Sierra
  5Dh  G   800  600 32k  P15
  5Eh  G  1280 1024 256  P8
  5Fh  G   640  480 16m  P24
  60h  G   800  600 64k  P16
  61h  G   640  400 256  P8

Note that the OAK-087 BIOS version 1.01B does not set the DAC mode of the
HiColor modes correctly.


  (OTI037C "UNIQUE" VGA)

  50h  T   132   25  16  (8x14)
  51h  T   132   43  16  (8x8)
  52h  G   800  600  16  PL4


  (OTI037C with NEL Electronics BIOS)

  50h  G   640  480  16  PL4
  51h  T    80   30      (16x9)
  52h  G  1024  480  16  PL4
  53h  T    80   25      (16x8)
  54h  T   132   43      (8x8)
  55h  T   132   25      (14x8)
  56h  T   132   43      (8x9)
  57h  T   132   25      (14x9)
  58h  T    80   43      (8x8)
  59h  T    80   43      (8x9)
  5Ah  T    80   60      (8x8)
  5Bh  G   800  600  16  PL4
  5Ch  T   100   37      (16x8)
  5Dh  T   100   75      (8x8)
  5Eh  G   800  600  16  PL4
  6Ah  G   800  600  16  PL4
  6Bh  T   100   37      (16x8)

----------10FF-----------------------------------
INT 10 - VIDEO - OAK VGA BIOS v1.02+ - SET EMULATION
        AH = FFh
        AL = Emulation
               43h  CGA emulation
               45h  EGA emulation
               4Dh  Hercules emulation
               56h  VGA emulation
        ES:DI -> signature string "Calamity"
Switches to the desired emulation