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- UMC 85c408
-
-
- Support chips:
-
- UM9502 Clock chip
-
- UM70c178 High color 15/16 bit DAC (Similar to Sierra SC11487)
-
-
- 3BFh (R/W):
- Note: written with ACh on startup ?
-
- 3C4h index 5 (R/W):
- bit 5
- 7
-
- 3C4h index 6 (R/W):
- bit 0-3 Read bank in 64K units
- 4-7 Write bank in 64K units
-
- 3C4h index 7 (R/W):
- bit 0 Clock select?
- 1
- 2 If set memory access is 16bit, if clear 8bit.
- 3
- 6-7 Video Memory: 0: 256K, 1: 512K, 2/3: 1MB
- Set by BIOS on initialisation.
-
- 3C4h index 8 (R/W):
- bit 3 If set causes the first >200 pixels of each scanline to be blanked ??
- 5 If set changes the order/way pixels are displayed:
- In 16 color modes each even byte is shown twice, causing the odd ones
- to be skipped.
- In "normal" 256color modes (3d4h index 33h bit 4 is clear), each even
- bank (64K) is shown twice, causing the odd ones to be skipped.
- In extended 256color modes (3d4h index 33h bit 4 is set) some strange
- pixel replication happens
- 6 Clock select ?
- 7 If clear disables bit 0 of the bank registers
-
- 3C4h index 9 (R/W):
- bit 2 Causes drastic color shifts if set??
- 3 Blanks display if set
- 7 Clock select ??
-
- 3C4h index 0Ah (R/W):
-
- 3CEh index 9 (R/W):
- bit 2
- 3 Changes the order/way pixels are decoded within each byte/word/dword.
-
- 3CEh index 0Ah (R/W): Scratch
- bit 0
- 1
- 2 If set HiColor is 64K, if clear 32K
- 3 If set only use lowest 2 bits of each bank register
- 4
- 6
- 7 If set only use lowest bit of the bank registers
-
- 3CEh index 0Bh (R/W): Scratch
- bit 0-7 Current Video Mode
-
- 3d4h index 2Eh (R/W):
- bit 3 If set doubles each scan line
- 4-5 Clock select ??
- 7 Clock select ??
-
- 3d4h index 2Fh (R/W):
- bit 0 Set if in an interlaced mode
- 1 If set disables access to memory above 256K ?
- 4-7 Clock select ??
-
- 3d4h index 33h (R/W):
- bit 1 Display Start Address bit 16
- 4 Set if in an extended 256color mode
-
-
- ID UMC superVGA:
-
- old:=inp($3BF);
- outp($3BF,3);
- if not testinx($3C4,6) then
- begin
- outp($3BF,$AC);
- if testinx($3C4,6) then UMC
- end;
- outp($3BF,old);
-
-
-
- Modes:
-
- 46h T 132 25 2 (8x14)
- 47h T 132 29 2 (8x12)
- 48h T 132 32 2 (8x12)
- 49h T 132 44 2 (8x8)
- 50h G 640 480 32K P15/P16 !Note: 32K or 64K is selected
- 51h G 800 600 32K P15/P16 !from 3CEh index Ah bit 2.
- 58h T 80 32 16 (9x16)
- 5Ch G 640 480 256 P8
- 5Eh G 800 600 256 P8
- 5Fh G 1024 768 16 PL4
- 60h T 132 25 16 (8x14)
- 61h T 132 29 16 (8x12)
- 62h T 132 32 16 (8x12)
- 63h T 132 44 16 (8x8)
- 64h T 132 60 16 (8x8)
- 6Ah G 800 100 16 PL4
- 6Bh T 100 37 16 (8x16)
- 6Ch G 800 600 256 P8
- 72h T 80 60 16 (8x8)
- 73h G 640 480 16 PL4
- 74h T 80 66 16 (8x8)
- 78h T 100 37 16 (8x16)
- 79h G 800 600 16 PL4
- 7Ah G 1280 1024 16 PL4
- 7Dh G 512 512 256 P8
- 7Eh G 640 400 256 P8
- 7Fh G 1024 768 256 P8
-
- ---------V-1012-A0----------------------------
- INT 10 - VIDEO - UMC - SET SCROLL TYPE
- AH = 12h
- BL = A0h
- AL = Type of scroll in text modes
- 00h Jump (Sets 0:487h bit 6)
- 01h Smooth (Clears 0:487h bit 6)
- ---------V-102000-----------------------------
- INT 10 - VIDEO - UMC - GET BANKs
- AH = 2000h
- Return: AL = 20h if supported
- BL = Read bank
- BH = Write bank
- ---------V-102001-----------------------------
- INT 10 - VIDEO - UMC - SET BANKs
- AH = 2001h
- BL = Read Bank
- BH = Write Bank
- Return: AL = 20h if supported
-