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- Tseng Super VGA
-
- ET3000-AX 512k 8/16 bit Main chip
- -BX 512k 8 bit
- -Bp 256k 8 bit Basic chip
- ET4000 1M 8/16 bit
-
- ET4000/X32 will be released in '92 supporting 24bit colors, 4MB DRAM or VRAM
- and built-in accelerator.
-
-
- Registers:
-
- 102h: Microchannel Setup Control
- bit 0 Disable Card if set
-
- 3BFh (R/W): Hercules Compatability register
-
- 3C0h index 16h: ATC Miscellaneous
- (Write data to 3C0h, Read from 3C1h (May not be needed))
- bit 4,5 High resolution timings.
-
- 3C3h (R/W): Microchannel Video Subsystem Enable Register:
- bit 0 Enable Microchannel VGA if set
-
- 3C4h index 6 (R/W): Zoom Control (ET3000 Only)
- bit 0-2 Yzoom factor 0=1:1
- 4-6 Xzoom factor 0=1:1
- 7 Hardware zoom enabled if set
-
- 3C4h index 7 (R/W): TS Auxiliary Mode
- bit 0 (ET3000 Only) Switch Normal Window if set (Text/Graph)
- 1 (ET3000 Only) Switch Zoom Window if set (Text/Graph)
- 2 (ET3000 Only) Switch Split Window if set (Text/Graph)
- 4 (ET3000 Only) If set 8 simultaneous fonts are enabled,
- using bit 3,4,6 of each attribute byte
- to select the font.
- 3,5 Rom Bios Enable/Disable:
- 0 0 C000-C3FF Enabled
- 0 1 Rom disabled
- 1 0 C000-C5FF,C680-C7FF Enabled
- 1 1 C000-C7FF Enabled
- 6 MCLK/2 if set
- 7 VGA compatible if set EGA else.
-
- 3CBh (R/W): PEL Address/Data Wd
-
- 3CDh (R/W): Segment Select
- bit 0-2 (ET3000) 64k Write bank nr
- 3-5 (ET3000) 64k Read bank nr
- 6-7 (ET3000) Segment Configuration.
- 0 128K segments
- 1 64K segments
- 2 1M linear memory
- 0-3 (ET4000) 64k Write bank nr (0..15)
- 4-7 (ET4000) 64k Read bank nr (0..15)
-
- 3CEh index Dh (R/W): Microsequencer Mode
-
- 3CEh index Eh (R/W): Microsequencer Reset
-
- 3d4h index 1Bh (R/W): X Zoom Start Address (ET3000 Only)
- bit 0-7 Offset of Zoom window start in character clocks
- (8 pixels) from left edge
-
- 3d4h index 1Ch (R/W): X Zoom End (ET3000 Only)
- bit 0-7 Offset of Zoom window end in char clocks from left edge
-
- 3d4h index 1Dh (R/W): Y Zoom Start Address (ET3000 Only)
- bit 0-7 Start line of zoom window bit 0-7
-
- 3d4h index 1Eh (R/W): Y Zoom End Address (ET3000 Only)
- bit 0-7 (ET3000 Only) End line of zoom window bit 0-7
-
- 3d4h index 1Fh (R/W): Y Zoom Start and End High (ET3000 Only)
- bit 0-2 End line of zoom window bit 8-10
- 3-5 Start line of zoom window bit 8-10
-
- 3d4h index 20h (R/W): Zoom Start Address Low (ET3000 Only)
- bit 0-7 Zoom Start Address bit 0-7
- Address of Zoom data
-
- 3d4h index 21h (R/W): Zoom Start Address Middle (ET3000 Only)
- bit 0-7 Zoom Start Address bit 8-15
-
- 3d4h index 23h (R/W): Extended start ET3000 (ET3000 Only)
- bit 0 Cursor start address bit 16
- 1 Display start address bit 16
- 2 Zoom start address bit 16
-
- 3d4h index 24h (R/W): Compatibility Control
- bit 0 Enable Clock Translate
- 1 Additional Master Clock Select
- 2 Enable tri-state for all output pins
- 3 Enable input A8 of 1MB DRAMs
- 4 Reserved
- 5 Enable external ROM CRTC translation
- 6 Enable Double Scan and Underline Attribute
- 7 CGA/MDA/Hercules
-
- 3d4h index 25h (R/W): Overflow High ET3000 (ET3000 Only)
- bit 0 Vertical Blank Start bit 10
- 1 Vertical Total Start bit 10
- 2 Vertical Display End bit 10
- 3 Vertical Sync Start bit 10
- 4 Line Compare bit 10
- 5-6 Reserved
- 7 Vertical Interlace if set
-
- 3d4h index 32h (R/W): RAS/CAS Video Config
- Ram timing, System clock and Ram type. Sample values:
- 00h VRAM 80nsec
- 09h VRAM 100nsec
- 00h VRAM 28MHz
- 08h VRAM 36MHz
- 70h DRAM 40MHz
-
- 3d4h index 33h (R/W): Extended start ET4000 (ET4000 Only)
- bit 0-1 Display start address bits 16-17
- 2-3 Cursor start address bits 16-17
- Can be used to ID ET4000
-
- 3d4h index 34h (R/W): Compatibility Control Register
- bit 3 if set Video Subsystem Enable Register at 46E8h
- else at 3C3h.
-
- 3d4h index 35h (R/W): Overflow High ET4000 (ET4000 Only)
- bit 0 Vertical Blank Start Bit 10
- 1 Vertical Total Bit 10
- 2 Vertical Display End Bit 10
- 3 Vertical Sync Start Bit 10
- 4 Line Compare Bit 10
- 5 Gen-Lock Enabled if set (External sync)
- 6 Read/Modify/Write Enabled if set. Currently not implemented.
- 7 Vertical interlace if set
-
- 3d4h index 36h (R/W): Video System Configuration 1
- bit 3 16 bit wide fonts if set, else 8 bit wide
- 4 (ET4000 Only) Linear addressing if set
- Video Memory is mapped as a 1 Meg block above 1MB.
- 6 16 bit data path (video memory) if set
- 7 16 bit data (I/O operations) if set
-
- 3d4h index 37h (R/W): Video System Configuration 2
- bit 0-1 Memory size 0,1=256k, 2=512k, 3=1M ???
- 3 Clear if 64kx4 RAMs ???
- if set RAM size = (bit 0-1)*256k
- else RAM size = (bit 0-1)* 64k
- 4 16 bit ROM access if set
- 5 Memory bandwidth (0 better than 1) ???
- 7 VRAM installed if set DRAM else.
- bit 6? Block read ahead (BRA) if clear
-
- 3d4h index 3Fh (R/W):
- bit 7 This bit seems to be bit 8 of the CRTC offset register (3d4h index 13h).
-
- 3d8h (R/W): Display Mode Control
-
- 46E8h (R): Video Subsystem Enable Register
- bit 3 Enable VGA if set
-
-
- 3C4h index 05 used.
-
-
- Bank Switching:
-
- 64k banks are selected by the Segment Select Register at 3CDh.
- Both a Read and a Write segment can be selected.
-
- Hardware Zoom (ET3000 Only).
-
- The ET3000 can zoom a part of display memory in a window.
- The display memory position and window position are selected
- by 3d4h index 1Bh to 21h.
-
-
- Identify Tseng Chipset:
-
- outp($3BF,3);
- outp($3D8,$A0); {Enable ET4000 extensions}
- if tstrg($3CD,$3f) then
- if testinx2(base,$33,$f) then Tseng 4000
- else Tseng 3000;
-
-
- Video Modes:
- 8 T 132 25 2 (STB only)
- Ah T 132 44 2
-
- 18h T 132 44 4 (8x8) B000
- 19h T 132 25 4 (9x14) B000
- 1Ah T 132 28 4 (9x13) B000
- 22h T 132 44 16 (8x8)
- 23h T 132 25 16 (8x14)
- 24h T 132 28 16 (8x13)
- 25h G 640 480 16 planar
- 26h T 80 60 16 (8x8)
- 27h G 720 512 16 planar (Tseng recommended, few boards)
- 29h G 800 600 16 planar
- 2Ah T 100 40 16 planar
- 2Dh G 640 350 256 packed
- 2Eh G 640 480 256 packed
- 2Fh G 640 400 256 packed (ET4000 Only)
- 2Fh G 720 512 256 packed (Tseng recommended, few boards)
- 30h G 800 600 256 packed
- 36h G 960 720 16 planar (STB only)
- 37h G 1024 768 16 planar
- 38h G 1024 768 256 packed (ET4000 Only)
- 3Dh G 1280 1024 16 planar (newer ET4000s)
- 3Eh G 1280 960 16 planar (Definicon)
- 3Eh G 640 480 32k Sierra 15-bit (Compaq Qvision)
-
-
-
- BIOS extensions (Tseng 4000 Sierra HiColor DAC):
-
- ----------1010E0-----------------------------
- INT 10 - VIDEO - SpeedStar 24 - SET TrueColor GRAPHICS MODE
- AX = 10E0h
- BL = 2Eh
- Return: AX = 0010h if successfull
- other on error
- Enters 24bit 640x480 mode if SS24 DAC present.
- Video memory is NOT cleared.
- Each line uses 2048 bytes with only 640x3=1920 bytes actually used.
- So that a line can never cross a 64K border.
- ----------1010F0-----------------------------
- INT 10 - VIDEO - Tseng ET-4000 BIOS - SET HiColor GRAPHICS MODE
- AX = 10F0h
- BL = video mode (see also AH=00h)
- 32768-color modes:
- 13h = 320x200
- 2Dh = 640x350
- 2Eh = 640x480
- 2Fh = 640x400
- 30h = 800x600
- 3Eh = 640x480 16M colors (Genoa 7900)
- 16M color modes:
- 3Eh = 640x480 (Genoa 7900)
- BX = 2DFFh = 640x350 (MEGAVGA/2)
- 2EFFh = 640x480 (MEGAVGA/2)
- 2FFFh = 640x400 (MEGAVGA/2)
- Return: AX = 0010h if successful
- other on error
- SeeAlso: AX=10F1h
- ----------1010F1-----------------------------
- INT 10 - VIDEO - Tseng ET-4000 BIOS - GET DAC TYPE
- AX = 10F1h
- Return: AX = 0010h if successful, errorcode if not
- BL = type of digital/analog converter
- 00h normal VGA DAC
- 01h Sierra SC1148x HiColor DAC
-
- (Diamond SpeedStar 24:)
- 02h New SS24 DAC (16M colors)
-
- (MEGAVGA/2 BIOS:)
- 02h Sierra Mark2 (15-bit) or Mark3 (16-bit) DAC
- 03h ATT20c491 or 492 15/16/24 bit HiColor DAC
- 04h AcuMos ADAC1 (15/16/24 bit)
- else other HiColor DAC
- SeeAlso: AX=10F0h
- ----------1010F2-----------------------------
- INT 10 - VIDEO - Tseng ET-4000 BIOS - GET/SET HiColor MODE
- AX = 10F2h
- BL = 00h Get current HiColor mode
- 01h Set 15bit HiColor mode
- 02h Set 16bit HiColor mode
- Return: AX = 0010h if successfull, errorcode if not
- BL = Current HiColor mode:
- 00h Not in HiColor mode or not a HiColor DAC
- 01h 15-bit RGB mode
- 02h 16-bit RGB mode
- 03h 24-bit RGB mode
-
- Note: Set HiColor mode (BL=1 or 2) only works if already in some HiColor mode.
-
-
- Notes:
- The sequence:
-
- port[$3BF]:=3;
- port[$3D8]:=$A0;
-
- is apparently needed to enable the extensions in the Tseng 4000.
- Most BIOSes do this by default, but some such as the Sigma VGA Legend
- requires this sequence.
- Let me know if you encounter any other examples.
-