avance.txt

比较详尽的VGA端口寄存器的文档

          23h
     2-4  Bits 0-2 of the HW cursor X position. The upper bits are in index
          21h
       5  If set enables the HW cursor. To preserve the stability of the
          cursor, this bit should be set with each update of this register.
       6  Bit 0 of the HW cursor Y position. (see note on interlace).

3d4h index 27h W(R/W):  Cursor Map address
bit 0-10  The address in video memory where the HW cursor map starts.
          In planar modes this address is in units of 256 bytes,
          in packed modes in units of 1024 bytes.
          The HW cursor is a 64x64 bitmap imposed on the display.
          The cursor map is stored as a 64x64x2bit array, where each pixel is:
             0: Background color (3C0h index 16h)
             1: Foreground color (3C0h index 15h)
             2: The screen data (transparent cursor).
             3: Inverted screen data (XOR cursor)
Note: in interlaced modes the cursor is shown double height.

3d4h index 28h (R/W):  Vertical Extended reg
bit    7  CRTC Offset bit 8. Bits 0-7 are in 3d4h index 13h
Note: The extensions of the CRTC registers in this register are only
      active if 3d4h index 19h bit 7 is set.

3d4h index 2Ah (R/W):  Horizontal Extended reg                      (2201 +)
bit    0  Horizontal Total bit 8. Bits 0-7 are in 3d4h index 00h
       3  Horizontal Blanking ??.
       4  ??
       5  ??
Note: The extensions of the CRTC registers in this register are only active
      if 3d4h index 19h bit 7 is set.

3D6h (R/W):  Read Address Register
bit  0-4  64k Read bank number. If 3CEh index Fh bit 2 is set all reads use
          this bank number, if clear all accesses use 3D7h.

3D7h (R/W):  Read/Write Address Register
bit  0-4  64k Bank number. If 3CEh index Fh bit 2 is clear all accesses use
          this bank number, if set writes use this bank and reads use 3D6h.

8280h W(R/W): Source address low
bit 0-15  The lower 16 bits of the pixel address of the source area.

8282h (R/W): Source address high
bit  0-7  The upper 8 bits of the pixel address of the source area.
          Calculated as (line no.)*(pixels per line)+(pixel no. in line).

8284h W(R/W): Source area scanline width.
bit 0-15  The number of pixels in a scanline at the source.

8286h W(R/W): Destination address low.
bit 0-15  Lower 16 bits of the pixel address of the destination area.

8288h (R/W): Destination Address high.
bit  0-7  The upper 8 bits of the pixel address of the destination area.
          Calculated as (line no.)*(pixels per line)+(pixel no. in line).

828Ah W(R/W): Destination area scanline width
bit 0-15  Number of pixels in a scanline at the destination.

828Ch W(R/W): Width of op.
bit 0-15  Width of the blit area in pixels.

828Eh W(R/W): Height of op.
bit 0-15  Number of lines in the blit area.

8290h (R/W):
bit  0-5  7 If moving towards higher co-ordinates, 1 if moving towards lower.
          0 (or don't care) for line draws
       6  If set drawing only happens within the rectangle defined by
          8294h-9Ah.
          X co-ordinate must be >= 8294h and <=8296h.
          Y co-ordinate must be >= 8298h and <=829Ah.

8292h W(R/W):
bit  0-7  always 0Dh ???
       8  (Line Draw) If set the final position is to the left of the start
       9  (Line Draw) If set the final position is above the start
      10  (Line Draw) If set (Delta X) and (Delta Y) are swapped when
          calculating the Bresenham constants in 82A2h-A6h.
      11  ??
      12  Set if moving towards lower co-ordinates, clear if not.

8294h W(R/W):  Clipping left
bit 0-15  If 8290h bit 6 is set drawing only happens if the X-co-ordinate is
           >= this value

8296h W(R/W):  Clipping right
bit 0-15  If 8290h bit 6 is set drawing only happens if the X-co-ordinate is
           <= this value

8298h W(R/W):  Clipping top
bit 0-15  If 8290h bit 6 is set drawing only happens if the Y-co-ordinate is
           >= this value

829Ah W(R/W):  Clipping bottom
bit 0-15  If 8290h bit 6 is set drawing only happens if the Y-co-ordinate is
           <= this value

829Ch W(R/W): Start X co-ordinate
bit 0-15  Starting X co-ordinate of the destination area.

829Eh W(R/W): Start Y co-ordinate
bit 0-15  Starting Y co-ordinate of the destination area

82A0h W(R/W):
bit 0-15  Always set to 0 ??

82A2h W(R/W):  Bresenham Constant 1
bit 0-15  The Bresenham Constant 1 used for line drawing
          Calculated as  2*(Delta Y). If 8292h bit 10 is set 2*(Delta X) is
          used.

82A4h W(R/W):  Bresenham Constant 2
bit 0-15  The Bresenham Constant 2 used for line drawing
          Calculated as  2*((Delta Y) - (Delta X)). If 8292h bit 10 is set
          (Delta Y) and (Delta X) are swapped in the calculation.

82A6h W(R/W):  Bresenham Error Term
bit 0-15  The Bresenham Error Term used for line drawing.
          Calculated as  2*(Delta Y) + (Delta X). If 8292h bit 10 is set
          (Delta Y) and (Delta X) are swapped in the calculation.

82A8h W(R/W):
bit 0-15  (Line draw) Pattern mask. Only the set bits are drawn.

82AAh (R/W): COP status/instruction
bit  0-3  (R) When 0 the COP is free.
     0-7  (W) Graphics instruction:
               1: Fill rectangle
               2: Copy rectangle
               4: ?
               8: Line draw

82B0h

82BAh (R):  Status??
bit    7  Set if busy ?

82BCh

82C0h

82C8h W(R/W):
bit

82CAh W(R/W):
82CCh W(R/W):




ID Avance Logic chip:

  old:=rdinx($3d4,$1A);
  clrinx($3d4,$1A,$10);            {Disable extensions}
  if not testinx($3d4,$19) then
  begin
    setinx($3d4,$1A,$10);          {Enable extensions}
    if testinx($3d4,$19) and testinx2($3d4,$1A,$3F) then
       Avance Logic AL2101 !!
  end;
  wrinx($3d4,$1A,old);



  Video modes:

    20h  T   132   25  16
    21h  T   132   30  16
    22h  T   132   43  16
    23h  T   132   60  16
    24h  T    80   30  16
    25h  T    80   43  16
    26h  T    80   60  16
    27h  G   960  720  16  PL4
    28h  G   512  512 256  P8
    29h  G   640  400 256  P8
    2Ah  G   640  480 256  P8
    2Bh  G   800  600  16  PL4
    2Ch  G   800  600 256  P8
    2Dh  G   768 1024  16  Pl4
    2Eh  G   768 1024 256  P8
    2Fh  G  1024  768   4
    30h  G  1024  768  16  PL4
    31h  G  1024  768 256  P8
    33h  G  1024 1024 256  P8
    36h  G  1280 1024  16  PL4
    37h  G  1280 1024 256  P8
    40h  G   320  200 64k  P16
    41h  G   512  512 64k  P16
    42h  G   640  400 64k  P16
    43h  G   640  480 64k  P16
    44h  G   800  600 64k  P16
    45h  G  1024  768 64k  P16
    48h  G   640  480 16m  P24
    49h  G   800  600 16m  P24