OTI037C has 256K or 512K.
OTI-067 has 256K or 512K.
OTI-077 allows 1MB and up to 1024x768 in 256 colors.
3DEh index 9h (R/W):
3DEh index 0Ah (R/W):
3DEh index 0Bh (R/W):
bit 5-7 (077) Chip revision. 5=OTI-077.
3DEh index Dh (R/W):
bit 6 1MB if set
7 512K if set, 256 else.
3DEh index 11h (R/W):
bit 0-3 Read Bank no
4-7 Write Bank no
Note: Some sources gives this register as 3DFh with no index.
Note: This register apparently write only in Oak-037C.
Bank Switching:
Two banks exist in reg 3DEh index 11h.
ID Oak VGA:
if testinx2($3DE,$D,$38) then
begin
_OAK_37C !!
if testinx($3DE,$11) then
if rdinx($3DE,$B)=5 then _OAK_077 {Haven't tested the -077}
else _OAK_067;
end;
Modes:
(OTI 067/077)
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 planar
53h G 640 480 256 packed
54h G 800 600 256 packed
55h G 1024 768 4 ??
56h G 1024 768 16 planar
57h G 768 1024 4 ??
58h G 1280 1024 16 planar
59h G 1024 768 256 planar OTI-077 only
5Ah G 512 512 32k Sierra 15-bit OTI-077 w/Sierra
5Bh G 640 400 32k Sierra 15-bit OTI-077 w/Sierra
5Ch G 640 480 32k Sierra 15-bit OTI-077 w/Sierra
(OTI037C "UNIQUE" VGA)
50h T 132 25 16 (8x14)
51h T 132 43 16 (8x8)
52h G 800 600 16 planar
(OTI037C with NEL Electronics BIOS)
50h G 640 480 16 planar
51h T 80 30 (16x9)
52h G 1024 480 16 planar
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
5Ch T 100 37 (16x8)
5Dh T 100 75 (8x8)
5Eh G 800 600 16
6Ah G 800 600 16
6Bh T 100 37 (16x8)
