paradise.txt

比较详尽的VGA端口寄存器的文档

23C2h index 1/6 W(R/W):  BITBLT Dimension X
bit 0-11  Width of blit area in pixels for BitBLT operations. Length of line
          (= max (deltaX, deltaY)) for line draw

23C2h index 1/7 W(R/W):  BITBLT Dimension Y
bit 0-11  Height of blit area in scanlines for BitBLT operations.

23C2h index 1/8 W(R/W):  BITBLT Row Pitch                   (WD90c24,c31 only)
bit 0-11  Scanline width at the destination in pixels. This must match with
          the Dword system, so the 2 low bits are 0 in packed modes and the 3
          low bits are 0 in planar modes.

23C2h index 1/8 W(R/W):  Raster Op                              (WD90c33 only)
bit 8-11  Raster Operation
             0  ROP_Zero
             1  ROP_And
             2  ROP_SAnd
             3  ROP_Src
             4  ROP_NSad
             5  ROP_Dst
             6  ROP_Xor
             7  ROP_Or
             8  ROP_Nor
             9  ROP_XNor
            10  ROP_NDest
            11  ROP_Sond
            12  ROP_NSrc
            13  ROP_NSod
            14  ROP_NAnd
            15  ROP_One

23C2h index 1/9 W(W):  BITBLT Raster Op                     (WD90c24,c31 only)
bit 8-11  Raster operation
             0  ROP_Zero
             1  ROP_And
             2  ROP_SAnd
             3  ROP_Src
             4  ROP_NSad
             5  ROP_Dst
             6  ROP_Xor
             7  ROP_Or
             8  ROP_Nor
             9  ROP_XNor
            10  ROP_NDest
            11  ROP_Sond
            12  ROP_NSrc
            13  ROP_NSod
            14  ROP_NAnd
            15  ROP_One

23C2h index 1/9 W(R/W):  Left Clip                              (WD90c33 only)
bit 0-11  Left edge of (smallest X coordinate) the clipping rectangle

23C2h index 1/Ah W(R/W):  BLT Foreground Color              (WD90c24,c31 only)
bit  0-7  BitBLT foreground Color

23C2h index 1/Ah W(R/W):  Right Clip                            (WD90c33 only)
bit 0-11  Left edge of (largest X coordinate) the clipping rectangle

23C2h index 1/Bh W(R/W):  BLT Background Color              (WD90c24,c31 only)
bit  0-7  BitBLT background color

23C2h index 1/Bh W(R/W):  Top Clip                              (WD90c33 only)
bit 0-11  Top edge of (smallest Y coordinate) the clipping rectangle

23C2h index 1/Ch W(R/W):  BLT Transparency Color            (WD90c24,c31 only)
bit  0-7  If Color Transparency is enabled (23C2h index 1/1 bit 0 is set) the
          pixels in the destination area matching this value will not be
          overwritten. 23C2h index 1/0Dh can cause some bits to be ignored in
          the comparison

23C2h index 1/Ch W(R/W):  Bottom Clip                           (WD90c33 only)
bit 0-11  Bottom edge (largest Y coordinate) of the clipping rectangle

23C2h index 1/Dh W(R/W):  BLT Transparency Mask             (WD90c24,c31 only)
bit  0-7  BitBLT Transparency Mask. Each bit set causes the corresponding bit
          of the pixel color to be ignored in the transparency comparison

23C2h index 1/Eh W(W):  BLT Mask                            (WD90c24,c31 only)
bit  0-7  Each bit set enables the corresponding plane (0-3) for planar modes,
          or bit (0-7) for packed modes

23C2h index 1/Fh (R/W):  Drawing Block Index                    (WD90c33 only)
bit  0-7  Selects the register bank at 23C2h.
            0: System Control, 1: BitBLT, 2: Cursor, 3: (WD90c33) BitBLT 2
    8-11 Register Index (for read operations)

23C2h index 2/0 W(W):  Cursor Control                    (WD90c24,26,31+ only)
bit    4  (WD90c33) Enhanced Hardware Cursor (24bits per pixel).
           If set doubles the cursor horizontally ?
     5-7  Cursor Color Mode.
            0: Straight monochrome (compatibility)
            1: Two color cursor with inversion
            2: Two color cursor with special inversion
            3: Three color cursor
       8  Cursor Plane Protection enabled if set. In planar modes
    9-10  Cursor Pattern Type.
            0: 2bits per pixel 32x32 cursor
            1: 2bits per pixel 64x64 cursor
      11  Set to enable hardware cursor

23C2h index 2/1 W(W):  Cursor Pattern Address Low        (WD90c24,26,31+ only)
bit 0-11  Lower 12 bits of the address of the Cursor Bitmap.
          In 256 color modes this is in units of 4 bytes, in planar
          modes in bytes. The Upper bits are in index 2.
          The address is relative to the Display Start Address
Note: The cursor map data is a 32x32 or 64x64 bitmap with 2 bits per pixel.
      In packed modes (256c) the data is stored as 8bits of "A" data followed
      by 8bits of "B" data, in planar modes Map 0 and 2 hold the "A" data and
      Maps 1 & 3 the corresponding "B" data.
      The effect on each pixel depends on the Cursor Color Mode selected by
       23C2h index 2/0 bits 5-7:
        A:  B:    Mode 0:        Mode 1:        Mode 2:        Mode 3:
        0   0     All 0s       Secondary      Secondary      Secondary
        0   1     All 1s        Primary        Primary        Primary
        1   0   Transparent   Transparent    Transparent    Transparent
        1   1    Inverted      Inverted        Special        Auxilary

      Primary     is the color in 23C2h index 2/3
      Secondary   is the color in 23C2h index 2/4
      Auxilary    is the color in 23C2h index 2/8
      Special     is the screen data XNOR'ed with the Auxilary color
      Inverted    is inverted screen data (XOR cursor)
      Transparent is the screen data (Invisible cursor)

23C2h index 2/2 W(W):  Cursor Pattern Address High       (WD90c24,26,31+ only)
bit  0-7  Upper 8 bits of the address of the Cursor Bitmap in the display
          memory in units of 4 bytes. The Lower bits are in index 1.

23C2h index 2/3 W(R/W):  Cursor Primary Color               (WD90c24,31+ only)
bit  0-7  The primary cursor color as an 8bit palette index

23C2h index 2/4 W(R/W):  Cursor Secondary Color              (WD90c24,31 only)
bit  0-7  The Secondary Color as an 8bit palette index

23C2h index 2/4 W(R/W):  Cursor Primary Color mid. byte         (WD90c33 only)
bit  0-7  The primary cursor color middle byte

23C2h index 2/5 W(R/W):  Cursor Origin                       (WD90c24,31 only)
bit  0-5  The X hotspot position within the cursor from the left
    6-11  The Y hotspot position within the cursor from the top

23C2h index 2/5 W(R/W):  Cursor Primary Color high byte         (WD90c33 only)
bit  0-7  The primary cursor color high byte

23C2h index 2/6 W(R/W):  Cursor X position                   (WD90c24,31 only)
bit 0-10  The X position of the cursor hotspot in pixels from the left of the
          display. In Hi/True color modes this is in bytes, not pixels

23C2h index 2/6 W(R/W):  Cursor Secondary Color low byte        (WD90c33 only)
bit  0-7  The secondary cursor color low byte

23C2h index 2/7 W(R/W):  Cursor Y position                   (WD90c24,31 only)
bit 0-10  The Y position of the cursor hotspot in scanlines from the top of
          the display.

23C2h index 2/7 W(R/W):  Cursor Secondary Color middle byte     (WD90c33 only)
bit  0-7  The secondary cursor color middle byte

23C2h index 2/8 W(R/W):  Cursor Auxiliary Color              (WD90c24,31 only)
bit  0-7   The Auxilary cursor color as an 8bit palette index

23C2h index 2/8 W(R/W):  Cursor Secondary Color high byte       (WD90c33 only)
bit  0-7  The secondary cursor color high byte

23C2h index 2/9 W(R/W):  Cursor Auxilliary Color low byte       (WD90c33 only)
bit  0-7  The auxilliary cursor color low byte

23C2h index 2/Ah W(R/W):  Cursor Auxilliary Color middle byte   (WD90c33 only)
bit  0-7  The auxilliary cursor color middle byte

23C2h index 2/Bh W(R/W):  Cursor Auxilliary Color high byte     (WD90c33 only)
bit  0-7  The auxilliary cursor color high byte

23C2h index 2/Ch W(R/W):  Cursor Hotspot                        (WD90c33 only)
bit  0-5  The X hotspot position within the cursor from the left
    6-11  The Y hotspot position within the cursor from the top

23C2h index 2/Dh W(R/W):  Cursor X position                     (WD90c33 only)
bit 0-11  The X position of the cursor in pixels from the left.
          In Hi/Truecolor modes this is in units of 3 bytes ?huh?

23C2h index 2/Eh W(R/W):  Cursor Y position                     (WD90c33 only)
bit 0-11  The Y position of the cursor in scanlines from the top.

23C2h index 2/Fh W(R/W):  Cursor Register Block/Index           (WD90c33 only)
bit  0-7  Selects the register bank at 23C2h.
            0: System Control, 1: BitBLT, 2: Cursor, 3: BitBLT 2
    8-11 Register Index (for read operations)

23C2h index 3/0 W(R/W):  Map Base                               (WD90c33 only)
bit  0-?  Specifies (in units of 4KB) an offset from the start of display
          memory that is added to all source and destination addresses.

23C2h index 3/1 W(R/W):  Row Pitch                              (WD90c33 only)
bit 0-11  Scanline width at the destination in pixels.

23C2h index 3/2 W(R/W):  Foreground Color 0                     (WD90c33 only)
bit  0-7  Low byte of the foreground color

23C2h index 3/3 W(R/W):  Foreground Color 1                     (WD90c33 only)
bit  0-7  High byte of the foreground color

23C2h index 3/4 W(R/W):  Background Color 0                     (WD90c33 only)
bit  0-7  Low byte of the background color

23C2h index 3/5 W(R/W):  Background Color 1                     (WD90c33 only)
bit  0-7  High byte of the background color

23C2h index 3/6 W(R/W):  Transparency Color 0                   (WD90c33 only)
bit  0-7  Low byte of the transparency color

23C2h index 3/7 W(R/W):  Transparency Color 1                   (WD90c33 only)
bit  0-7  High byte of the transparency color

23C2h index 3/8 W(R/W):  Transparency Mask 0                    (WD90c33 only)
bit  0-7  Low byte of the transparency mask

23C2h index 3/9 W(R/W):  Transparency Mask 1                    (WD90c33 only)
bit  0-7  High byte of the transparency mask

23C2h index 3/Ah W(R/W):  Mask Byte Low                         (WD90c33 only)
bit  0-7  Low byte of the mask. Each bit when set enables writes to that plane

23C2h index 3/Bh W(R/W):  Mask Byte High                        (WD90c33 only)
bit  0-7  High byte of the mask.

23C2h index 3/Fh W(R/W):  Drawing Register Block/Index          (WD90c33 only)
bit  0-7  Selects the register bank at 23C2h.
            0: System Control, 1: BitBLT, 2: Cursor, 3: BitBLT 2
    8-11 Register Index (for read operations)


23C4h W(R/W):  BitBLT I/O Port
bit 0-15  When the source or destination is set to "system I/O address" the
          data must be read or written through this register. The transfer
          should always be a multipla of 4 bytes

23C8h W(R/W):  Bresenham Constant 1
bit 0-15  For Bresenham line drawing programmed with the constant:
           2* min(abs(Xend-Xstart),abs(Yend-Ystart))

23CAh W(R/W):  Bresenham Constant 2
bit 0-15  For Bresenham line drawing programmed with the constant:
           2* (min(abs(Xend-Xstart),abs(Yend-Ystart))
               - max(abs(Xend-Xstart),abs(Yend-Ystart)))

23CCh W(R/W):  Bresenham Error Term
bit 0-15  For Bresenham line drawing programmed with the constant:
           2*(min(abs(Xend-Xstart),abs(Yend-Ystart)))
               - max(abs(Xend-Xstart),abs(Yend-Ystart)) - d
          Where d is 0 if Xstart > Xend, -1 if not

23CEh (R/W):  Command Buffer                                         (WD90c33)
bit 0-3  (R) Command Buffer Locations. Number of occupied elements in the 8