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- OAK Technologies. OTI.
-
- OTI037C has 256K or 512K.
- OTI-067 has 256K or 512K.
- OTI-077 allows 1MB and up to 1024x768 in 256 colors.
- OTI-087 allows 2MB
-
-
- OAK-037, 067 and 077:
-
- 3DEh (R/W): Index register
- bit 0-4 Index to the OAK extended registers at 3DF.
- 5-7 (R) Chip version. 0=OAK=037C, 2=OAK-067, 5=OAK-077, 7=OAK-057
- Note: Has anyone seen an 057 ????
-
- 3DEh index 9h (R/W):
-
- 3DEh index 0Ah (R/W):
-
- 3DEh index 0Ch (R/W): CRT Control
- bit 3 I/O write test ?
-
- 3DEh index 0Dh (R/W): Misc
- bit 2-3 Should be set to enable access to memory above 256k
- 4 For 16 color modes should be set to enable access for memory above
- 256K
- 5 Clock Select bit 2. Bits 0-1 are in 3C2h/3CCh
- 6 1MB if set
- 7 512K if set, 256 else.
-
- 3DEh index 0Eh (R/W): Backwards Compatability
- bit 7 VGA mode if set
-
- 3DEh index 11h (R/W): Segment
- bit 0-3 Read Bank no
- 4-7 Write Bank no
- Note: This register apparently write only in Oak-037C.
-
- 3DEh index 12h (R/W): Config
-
- 3DEh index 14h (R/W): Overflow
- bit 0 Bit 10 of the VTotal Register (3d4h index 6)
- 1 Bit 10 of the Vertical Display End Register (3d4h index 12h)
- 2 Bit 10 of the Vertical Retrace Start Register (3d4h index 10h).
- 3 Bit 16 of the Display Start Address
- 7 Set if Interlace is enabled.
-
- 3DEh index 15h (R/W): Hsync/2
- bit 0-7 How far into the scanline the odd frame should start in interlaced
- modes. Usually half the VTotal value.
-
- 3DEh index 16h (R/W): Overflow 2 (77 only)
- bit 3 Bit 17 of the Display Start address
- Note: For 256color modes the Display Start Address is in units of 8 bytes,
- rather than 4 bytes.
-
- Bank Switching:
-
- Two banks exist in reg 3DEh index 11h.
-
-
-
- OAK-087:
-
- 3DEh index 0:
- bit 1 Set for OTI-083, Clear for OTI-087
-
- 3DEh index 2 (R/W):
- bit 1-2 Video Memory. 0=256k, 1=512k, 2=1M, 3=2M
-
- 3DEh index 3 (R/W):
- bit 5 ?? (Causes vertical stripes)
- 7 ??
-
- 3DEh index 4 (R/W):
- bit 2 Set if using Zero Wait States for the VESA Local BUS interface.
-
- 3DEh index 6 (R/W):
- bit 0 Clock select ??
- 2 Clock select ??
- 3 Output to RS2 on the DAC. ??
- If set causes 3C6h-3C9h to access the extended registers on the DAC
- 4 ?? (Display reset ??)
-
- 3DEh index 9 (R/W):
- bit 0 Set if 24bit DAC available ?
-
- 3DEh index Bh:
- bit 6 Clear if VESA monitor timings (Jumper )
- 7 Clear if non-interlaced monitor timings
-
- 3DEh index Dh (R/W):
- bit 4 Should be set in 16color modes
- 5 Clock Select ??
-
- 3DEh index 10h (R/W):
-
-
- 3DEh index 14h (R/W):
- bit 0 ?? (Makes the display "shake")
- 2 ??
- 3 Bit 16 of the Display Start Address. Note index 17h
- 7 Set if the display is interlaced
-
- 3DEh index 17h (R/W):
- bit 0-2 Display Start Address bit 16-18
-
- 3DEh index 18h (R/W):
- bit 2 Clock Select??
-
- 3DEh index 21h (R/W):
- bit 0-1 Clock select ??
- 2 Clear in mode 13h, set in all other 256color modes
-
- 3DEh index 23h (R/W): Write Bank Register
- bit 0-4 Read Bank in 64k units.
-
- 3DEh index 24h (R/W): Read Bank Register
- bit 0-4 Write Bank in 64k units.
-
- Indices 2-6, 9-Bh, Dh, 11h, 13h-15h, 17h-19h, 20-25h, 30h-36h are used by the
- OTI-087.
-
-
-
- ID Oak VGA:
-
- if testinx2($3DE,$D,$38) then
- begin
- { We have an OAK }
- if testreg2($3DE,$23,$1F) then
- if (rdinx($3DE,0) and 2)=0 then _OAK_087
- else _OAK_083
- else
- case inp($3DE) div 32 of
- 0:_OAK_037C
- 2:_OAK_067
- 5:_OAK_077
- 7:_OAK_057
- end;
- end;
-
-
- Modes:
-
- (OTI 067/077/087)
-
- 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 PL4
- 53h G 640 480 256 P8
- 54h G 800 600 256 P8
- 55h G 1024 768 4 ??
- 56h G 1024 768 16 PL4
- 57h G 768 1024 4 ??
- 58h G 1280 1024 16 PL4
- 59h G 1024 768 256 P8 OTI-077/87 only
- 5Ah G 640 480 64k P16 OTI-077 w/Sierra
- 5Bh G 640 400 32k P15 OTI-077 w/Sierra
- 5Ch G 640 480 32k P15 OTI-077 w/Sierra
- 5Dh G 800 600 32k P15
- 5Eh G 1280 1024 256 P8
- 5Fh G 640 480 16m P24
- 60h G 800 600 64k P16
- 61h G 640 400 256 P8
-
- Note that the OAK-087 BIOS version 1.01B does not set the DAC mode of the
- HiColor modes correctly.
-
-
- (OTI037C "UNIQUE" VGA)
-
- 50h T 132 25 16 (8x14)
- 51h T 132 43 16 (8x8)
- 52h G 800 600 16 PL4
-
-
- (OTI037C with NEL Electronics BIOS)
-
- 50h G 640 480 16 PL4
- 51h T 80 30 (16x9)
- 52h G 1024 480 16 PL4
- 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 PL4
- 5Ch T 100 37 (16x8)
- 5Dh T 100 75 (8x8)
- 5Eh G 800 600 16 PL4
- 6Ah G 800 600 16 PL4
- 6Bh T 100 37 (16x8)
-
- ----------10FF-----------------------------------
- INT 10 - VIDEO - OAK VGA BIOS v1.02+ - SET EMULATION
- AH = FFh
- AL = Emulation
- 43h CGA emulation
- 45h EGA emulation
- 4Dh Hercules emulation
- 56h VGA emulation
- ES:DI -> signature string "Calamity"
- Switches to the desired emulation
-