Weitek

  W5086
  W5186    512K
  W5286    1MB

  Power 9000    Max 2MB. Not VGA compatible, but VGA chip can be added.
  Power 9100    '94 version of 9000 with VGA part built in. can handle 4MB.




W5x86:

3C4h index  5  (W):  Control Register 0

3C4h index  6  (W):  Control Register 1

3C4h index 11h (R/W):  Misc
bit   5  Clear to enable extensions
      6  Clear to enable bank addressing
Note to update this register first the it must be read and the value rewritten
     twice, then the changed value can be written

3C4h index 12h (R/W):  Output Control
bit 5-6  3 for 640x480, 1 for 800x600, 0 else

3C4h index 13h (R/W):  Memory Base
bit 0-3  Base Memory address

3CDh (R/W):  Bank Register
bit 0-3  Write Bank
    4-7  Read bank

3CEh index 0Ch (W):  Extended Graphics
bit   1  Clock select bit 2 (Bits 0-1 are in 3C2h/Ch bits 2-3).

3CEh index 0Dh (R/W):
bit 3-4  Display Start Address bit 16-17

3d4h index 19h (R/W):  Interlace

3d4h index 1Ah (R/W):  Serial Start High

3d4h index 1Bh (R/W):  Serial Start Low

3d4h index 1Ch (R/W):  Serial Offset


ID Weitek VGA:

  old:=rdinx(SEQ,$11);
  outp(SEQ+1,old);
  outp(SEQ+1,old);
  outp(SEQ+1,inp(SEQ+1) or $20);
  if not testinx(SEQ,$12) then
  begin
    x:=rdinx(SEQ,$11);
    outp(SEQ+1,old);
    outp(SEQ+1,old);
    outp(SEQ+1,inp(SEQ+1) and $DF);
    if testinx(SEQ,$12) and tstrg($3CD,$FF) then
    begin
      _Weitek chip_
    end;
  end;
  wrinx(SEQ,$11,old);


Video Modes:

0054h  T   132   43
0055h  T   132   25
0056h  T   132   43  4color
0057h  T   132   25  4color
0058h  G   800  600   16c  PL4
0059h  G   800  600   16c  PL4
005Ch  G   800  600  256c  P8
005Dh  G  1024  768   16c  PL4
005Eh  G  1024  768  256c  P8
005Fh  G   640  480  256c  P8
0064h  T   132   60
0065h  T   132   50
0066h  T   132   60   4c
0067h  T   132   50   4c
0068h  T    80   60
006Ah  G   800  600   16c  PL4
006Ch  G   640  480  32Kc  P15
006Dh  G   800  600  32Kc  P15
006Eh  G   640  480  64Kc  P16
006Fh  G   800  600  64Kc  P16



Power 9000:

3CDh (R/W):  Bank Register:
bit 0-4  Bank number
      5  Set if addressing Video Memory, clear if addressing the memory mapped
         registers.
Note: 10h maps the memory mapped registers at A000h, 20h-3Fh maps the 
      Video Memory at A000h


4386-9h  DAC
8386-9h  DAC
C386-9h  DAC