CL-GD 5422 Upto 1MB, 1024x768x256. Very different from 5/6xx series
This is sometimes called AVGA3 any relation to AcuMos ??
3C4h index 6 (W):
bit 0-7 Writing ("Eagle ID" rol 4) will disable extensions.
"Eagle ID" will enable.
Reading will return 0 if last write was to disable,
1 if it was to enable
3C4h index 80h (R/W): Miscellaneous Control 1
3C4h index 81h (R/W): Graphics Position 1
3C4h index 82h (R/W): Graphics Position 2
3C4h index 83h (R/W): Attribute Controller Index
3C4h index 84h (R/W): Write Control
3C4h index 85h (R/W): Timing Control
3C4h index 86h (R/W): Bandwidth Control
3C4h index 87h (R/W): Miscellaneous Control 2
3C4h index 88h (R/W): Horizontal Sync skew
3C4h index 89h (R/W): CGA, HGC Font Control
3C4h index 8Ah (R/W): Reserved
3C4h index 8Bh (R/W): Screen B preset row scan
3C4h index 8Ch (R/W): Screen B start address high
3C4h index 8Dh (R/W): Screen B start address low
3C4h index 8Eh (R): Version Code
3C4h index 8Fh (R): Version Code
3C4h index 90h (R/W): Vertical Retrace Start
3C4h index 91h (R/W): Vertical Retrace End
3C4h index 92h (R/W): Lightpen High
3C4h index 93h (R/W): Lightpen Low
3C4h index 94h (R/W): Pointer Pattern Address High
3C4h index 95h (R/W): Cursor Height Adjust
3C4h index 96h (R/W): Caret Width
3C4h index 97h (R/W): Caret Height
3C4h index 98h (R/W): Caret Horizontal Position High
3C4h index 99h (R/W): Caret Horizontal Position Low
3C4h index 9Ah (R/W): Caret Vertical Position High
3C4h index 9Bh (R/W): Caret Vertical Position Low
3C4h index 9Ch (R/W): Pointer Horizontal Position High
3C4h index 9Dh (R/W): Pointer Horizontal Position Low
3C4h index 9Eh (R/W): Pointer Vertical Position High
3C4h index 9Fh (R/W): Pointer Vertical Position Low
3C4h index A0h (R/W): Graphics Controller Memory Latch 0
3C4h index A1h (R/W): Graphics Controller Memory Latch 1
3C4h index A2h (R/W): Graphics Controller Memory Latch 2
3C4h index A3h (R/W): Graphics Controller Memory Latch 3
3C4h index A4h (R/W): Clock Select
3C4h index A5h (R/W): Cursor (Caret and pointer) Attribute
3C4h index A6h (R/W): Internal Switch Source
3C4h index A7h (R/W): Status Switch Control
3C4h index A8h (R/W): NMI Mask 1
3C4h index A9h (R/W): NMI Mask 2
3C4h index AAh (R/W): Reserved
3C4h index ABh (R): NMI Status 1
3C4h index ACh (R): NMI Status 2
3C4h index ADh (R/W): 256 Color mode Page Control
3C4h index AEh (R): NMI data cache (Four 24 bit words
3C4h index AFh (R/W): Active Adapter State
3C4h index B0h..BFh (R/W): Scratch Registers
3C4h index C0h..FFh (R/W): Reserved
3d4h index Ch (R/W): Screen A start address Hi
Must be cleared before the Eagle ID Register (3d4h index 1Fh) can be read.
3d4h index 1Fh (R): Eagle ID register
bit 0-7 Eagle ID. Used for test of 3C4h index 6.
ECh for CL-GD 510/520, CAh for 610/620. EAh for Video7 boards.
GD5422 series:
3C4h index 6 (R/W)
bit 0-7 Writing 12h to this register seems to enable extensions.
Unlike earlier Cirrus Chips the value can be read from the register.
3C4h index 7 (R/W):
bit 0-2 Memory mode. 1=256 colors, 3=15/16 bit RGB, 5=24bit RGB
3C4h index 8 (R/W):
3C4h index 9 (R/W):
bit 2-4 Monitor type. 0=Std VGA
3C4h index 0Ah (R/W):
3C4h index 0Bh (R/W):
3C4h index 0Ch (R/W):
3C4h index 0Dh (R/W):
3C4h index 0Eh (R/W):
3C4h index 0Fh (R/W):
bit 3-4 Video memory. 0=256K, 1=512K, 2=1MB.
5 Set if 256 or more colors ?
3C4h index 10h (R/W):
3C4h index 11h (R/W):
3C4h index 12h (R/W):
3C4h index 13h (R/W):
3C4h index 18h (R/W):
3C4h index 19h (R/W):
3C4h index 1Ah (R/W):
3C4h index 1Bh (R/W):
3C4h index 1Ch (R/W):
3C4h index 1Dh (R/W):
3C4h index 1Eh (R/W):
3CEh index 09h (R/W):
bit 0-7 4K Primary bank number.
3CEh index 0Ah (R/W):
bit 0-7 4K bank number (How do you enable this second bank register,
and how does it work ?).
3CEh index 0Bh (R/W):
3CEh index 10h (R/W):
3CEh index 11h (R/W):
3CEh index 12h (R/W):
3d4h index 19h (R/W):
3d4h index 1Ah (R/W):
bit 0 Set if an interlaced mode.
3d4h index 1Bh (R/W):
bit 0 Display Start Address bit 16. Bit 0-15 are in 3d4h index Ch-Dh.
2 Display Start Address bit 17
4 Bit 8 of the CRTC Offset register (3d4h index 13h) ?.
3d4h index 27h (R): Chip ID
bit 0-7 8Ah (type2), 8Ch-8Fh (type3), 90h-93h (type5) or 94h-97h (type4).
Memory locations:
$C000:$6 2 bytes 'CL' if Cirrus Bios
ID Cirrus VGA:
old:=rdinx(base,12);
outp(base+1,0);
eagle:=rdinx(base,$1f);
wrinx($3c4,6,(eagle shl 4)+(eagle shr 4));
if inp($3c5)=0 then
begin
outp($3c5,eagle);
if inp($3c5)=1 then
case eagle of
$EC:Cirrus 510/520;
$CA:Cirrus 610/620;
$EA:Cirrus Video7 OEM;
end;
end;
wrinx(base,12,old);
Video Modes:
15h T 132 25 2 (8x14)
16h T 132 44 2 (8x8)
18h T 132 30 2 (8x)
1Eh T 132 25 16 (8x8)
1Fh T 132 25 16 (8x14)
20h T 132 44 16 (8x8)
22h T 132 30 16 (8x)
31h T 100 37 2
40h G 720 540 16 planar
50h G 640 400 256 packed
51h G 512 480 256 packed Note: not supported in all Bios'es
63h G 720 540 16 planar
64h G 800 600 16 planar
6Ah G 800 600 16 planar
Modes for the GD 5320:
61h G 640 400 16 planar
62h G 640 450 16 planar
70h G 360 480 256 packed
71h G 528 400 256 packed
72h G 528 480 256 packed
74h G 320 240 256 packed
75h G 640 400 256 packed
Mode 50h and 51h use a special system where four pixels are stored at the
same byte address in plane 0,1,2 and 3 respectively.
Modes for the GD 5422:
14h T 132 25 16 (8x16)
54h T 132 43 16 (8x8)
55h T 132 25 16 (8x14)
58h G 800 600 16 planar
5Ch G 800 600 256 packed
5Dh G 1024 768 16 planar
5Fh G 640 480 256 packed
60h G 1024 768 256 packed
64h G 640 480 64K Sierra 16bit
65h G 800 600 64K Sierra 16bit
66h G 640 480 32K Sierra 15bit
67h G 800 600 32K Sierra 15bit
6Ah G 800 600 16 planar
6Ch G 1280 1024 16 planar
6Fh G 320 200 64K Sierra 16bit
70h G 320 200 16M RGB
71h G 640 480 16M RG
