Compaq Super VGA chips.
There are 3 "Families" of Compaq VGA chips:
Integrated Video Graphics System (IVGS):
Supports 640x480x16c. BitBLT functions
Advanced VGA System (AVGA):
Supports 800x600x16c and 640x480x256c. BitBLT functions.
QVision:
Supports 1024x768x256c. Newer versions support 1280x1024 and/or TrueColor.
Hardware Cursor, BitBLT.
3CEh index 0Bh (R/W):
bit 1 If set the ROM is 16bit wide, 8 if clear
2 If set video memory is 16bit wide, 8 if clear
3CEh index 0Ch (R/W):
bit 3-7 Version.
03h: IVGS
05h: AVGA
06h: QVision 1024
0Eh: QVision 1280 or 1024
10h: Advanced VGA Port
3CEh index 0Fh (R/W): Environment Register
bit 0-3 writing 5 to this register unlocks the extended registers.
4-7 0Ah if in AVGA mode, 0 if in QVision mode
Note: The QVision has a specific mode for AVGA support (Mode 29h and 2Eh),
where the AVGA accelerator function and registers are used.
3CEh index 10h (R/W): BLTConf
bit 2 If set the 2xxxh-3xxxh register block is mapped at 4xxxh-5xxxh
3-4 Video interrupt. 0= Active Low, 1,3=Active High, 2=Disabled.
5 Tri-state if set
3CEh index 40h (R/W): Control Register 0
bit 0 If set accesses to the upper bank (0A8000h-0AFFFFh) are calculated
from 0A8000h (I.e.. to create a 64K unified window index 46h should
be programmed with a value 8 larger than index 45h). If clear
accesses are relative to 0A0000h (I.e.. use same value in index 45h
and 46h).
3CEh index 42h (R/W):
bit 0 Bit 8 of the Display Offset (3d4h index 13h)
2-3 Display start offset bit 16-17.
7 Set in 1280x1024 modes ??
3CEh index 43h (R/W):
3CEh index 45h (R/W): Page Register 0
bit 0-7 Bank number in 4KB blocks for accesses to A000h-A7FFh.
Note: In the QVision 1280 the bank can be in units of 16KB
3CEh index 46h (R/W): Page Register 1
bit 0-7 Bank number in 4KB units for accesses to A800h-AFFFh
If index 40h bit 0 is set this value must be 8 larger than the value
in index 45h (8*4k = 32k) to provide a 64k unified window. If index
40h bit 0 is clear this value should be the same as in index 45h.
3CEh index 48h (R/W):
bit 0-3 High Area Memory (0=disabled, 1-0Eh = the 1MB boundary the HMA
starts at). The HMA is a 1MB continuos mapping of the video buffer.
0-7 Lower 8 bits of the HMA start address
3CEh index 49h (R/W):
bit 0-7 Upper 8 bits of the HMA start address
3CEh index 50h
bit 3-6 Monitor (0,2,6??)
00h Compaq Internal Monitor
02h Compaq 16" Advanced Graphics Color Monitor
03h Compaq 1024 Color Monitor
04h QVision 200 (20") Color Monitor
05h Compaq SVGA Color Monitor
06h QVision 150 (15") Color Monitor or
Compaq 151 FS Color Monitor
0Eh Compaq 14" VGA Monitor (31.5 kHz)
3CEh index 51h (R/W):
3CEh index 54h (R/W): (QVision only)
bit 0-7 Video Memory. 2: 512k, 4: 1024k, 8: 2048k
Note: For the QVision 1024, 0 apparently means 1024KB.
3CEh index 56h (R/W): (QVision only)
bit 2 (R) Set for QVision 1280, clear for QVision 1024
3CEh index 5Ah (R/W): (QVision only)
bit 0-5 1 for copy, 2 for fill
6-7 Set to 3 or 0 ??
3CEh index 80h (R/W):
bit 2-3 2=Plasma system.
4-6 Palette option: 1=Standard palette, 2=Option B, 5=option A,
6=option C.
3CEh index 81h (R/W):
bit 2 Set for Palette option A-C and Standard palette, clear for option D.
13C7h (R/W):
bit 0-7 Data port for the Hardware Cursor map.
There are 2 128byte (32x32 bit) maps. Set 3C8h to 0 and then write
the 128 byte cursor bitmap to this register to load the actual icon.
. Set 3C8h to 80h and write the 128 byte cursor mask to this register
to mask any areas not included in the cursor.
13C8h (R/W)
bit 0-7 60h=4bit packed, 40h=8bit packed, 10h=24bit packed, 30h=15bit,
38h=16bit
13C9h (R/W):
bit 0-1 Set to 2 to enable the Hardware cursor, 0 to disable ??.
2-7 Always 8 ???
23C0h W(R/W): Source Address (IVGS, AVGA only)
bit 0-15 Address of source in DWORDs (256colors) or bytes (16colors).
(AVGA) Bit 16-17 are in 23C4h.
The exact address and size of the BitBLT can be adjusted by
33C0h,33C1h,33C8h and 33C9h
23C2h (R/W): Width of area (IVGS, AVGA only)
bit 0-7 Width in DWORDs of the Blit area.
23C2h W(R/W): Width of BitBLT operation (QVision only)
bit 0-9 Width of the BitBLT area in pixels
23C4h W(R/W): Height of the BitBLT area
bit 0-9 Number of lines in Blit area.
10-11 (AVGA) Bit 8-9 of the Scanline Width. Bit 0-15 are in
12-13 (AVGA) Bit 16-17 of the distance. Bit 0-15 are in 23CCh.
14-15 (AVGA) Bit 16-17 of Source address. Bit 0-15 are in 23C0h.
23CAh W(R/W): Scanline width. (IVGS, AVGA only)
bit 0-15 Width of destination in DWORDs (256color) or bytes (16color).
Negative if moving backwards.
23CCh W(R/W): Destination Address (IVGS, AVGA only)
bit 0-15 Distance between the Destination and the Source Address in DWORDs
(256colors) or bytes (16colors).
(AVGA) Bit 16-17 are in 23C4h bit 12-13.
23CEh W(R/W): Scanline width. (IVGS, AVGA only)
bit 0-15 Width of destination in DWORDs. Negative if moving backwards.
Note: one must be source and the other destination width
33C0h (R/W): (IVGS, AVGA only)
bit 0-7 Start pixel of BitBLT source
33C1h (R/W): (IVGS, AVGA only)
bit 0-7 Ending pixel of BitBLT destination
33C7h (R/W): (IVGS, AVGA only)
33C8h (R/W): (IVGS, AVGA only)
bit 0-1
Note: this is the same registers as 3CEh index 3 ??
33C9h (R/W): (IVGS, AVGA only)
33CAh W(R/W): Fore/Back ground color ?
33CCh W(R/W): Fore/Background color
Note: Apparently the Fore/Background color registers must be written twice to
work properly.
33CEh (R/W): COP Status/Command
bit 0 (R) If set the CoProcessor is busy.
0-5 (W) 11h = Copy. 9 = Fill.
6 (W) Copy/Fill backwards if set
33CFh (R/W):
63C0h W(R/W): Source Bitmap X-address (QVision only)
bit 0-9 The X co-ordinate of the start of the Source Data.
63C2h W(R/W): Source Bitmap Y-address (QVision only)
bit 0-9 The Y co-ordinate of the start of the Source Data.
63CAh (R/W):
bit 0-2 1=4bit packed, 3=8bit packed, 5= 15bit, 7=24 bit (packed as RGBa)
6 After loading the BitMap Address and Size registers, wait for this
bit to be 0 before setting final registers and starting the
command.
7 Wait for this bit to be 0, before loading the Source/Destination
address and BitMap size registers.
63CCh W(R/W): Destination Bitmap X-address (QVision only)
bit 0-9 The X co-ordinate of the start of the Destination Data
63CEh W(R/W): Destination Bitmap Y-address (QVision only)
bit 0-9 The Y co-ordinate of the start of the Destination Data
83C6h (R/W):
bit 1 If set the DAC is 8bit, if clear 6bit.
83C8h
93C6h W(R/W): Hardware Cursor Y-position
bit 0-9 The X-position of the right pixel of the hardware cursor.
93C8h W(R/W): Hardware Cursor X-position
bit 0-9 The Y-position of the lower scanline of the hardware cursor.
Note: Registers 3C6h-3C9h, 13C6h-13C9h, 83C6h-83C9h and 93C6h-93C9h are
physically in the Brooktree DAC.
ID Compaq super VGA:
old:=rdinx($3CE,$F);
wrinx($3CE,$F,0);
if not testinx($3CE,$45) then
begin
wrinx($3CE,$F,5);
if testinx($3CE,$45) then
begin
SubVers:=rdinx($3CE,$C) shr 3;
case SubVers of
3:name:='Compaq IVGS';
5:name:='Compaq AVGA';
6:name:='Compaq QVision 1024';
$E:if (rdinx(GRC,$56) and 4)>0 then name:='Compaq QVision 1280'
else name:='Compaq QVision 1024';
$10:name:='Compaq AVPort';
else UNK(Compaq)
end;
end;
end;
wrinx($3CE,$F,old);
Video Modes:
22h T 132x 43
23h T 132x 25
27h T 132x 50
28h T 132x 60
29h G 800x 600 16c PL4
2Eh G 640x 480 256c P8. Each scan line is 1024 bytes wide.
32h G 640x 480 256c P8 Each scan line is 1024 bytes wide
33h G 640x 400 256c P8 Each scan line is 1024 bytes wide
34h G 800x 600 256c P8 Each scan line is 1024 bytes wide
37h G 1024x 768 16c P4
38h G 1024x 768 256c P8
39h G 1280x1024 16c P4
3Ah G 1280x1024 256c P8 Each scan line is 2048 bytes wide
3Eh G 640x 480 32k P15
40h G 640 400 2 Compaq Portable only
4Dh G 512x 480 16m P32 Four bytes per pixel
4Eh G 640x 400 16m P32 Four bytes per pixel
BitBLTs:
There appear to be two different systems: mode 2Eh uses a system based on the
memory address of the bitmaps involved, and with some fields packed.
Is this to keep compatibility with something ??
Mode 32h, 37h and 38h use a system based on the pixel addresses of the bitmaps
Also some of the registers appear to be mapped to more than one address ??
I.e.. drivers some time adds a value to the register address.
Compaq BIOS extensions:
----------10BF00-----------------------------
INT 10 - VIDEO - Compaq Portable Extensions - SELECT EXTERNAL MONITOR
AX = BF00h
Note: all registers preserved and the internal monitor is blanked
the external monitor becomes the active monitor
----------10BF01-----------------------------
INT 10 - VIDEO - Compaq Portable Extensions - SELECT INTERNAL MONITOR
AX = BF01h
Note: all registers preserved and the external monitor is blanked
the internal monitor becomes the active monitor
----------10BF02-----------------------------
INT 10 - VIDEO - Compaq Portable Extensions - SET MASTER MODE OF CURRENT CTRLR
AX = BF02h
BH = master mode
04h CGA
05h EGA
07h MDA
----------10BF03BX0000-----------------------
INT 10 - VIDEO - Compaq Portable/Systempro Extensions - GET ENVIRONMENT
AX = BF03h
BX = 0000h
Return: BH = active monitor
00h = external
01h = internal
BL = master mode
00h = switchable VDU not present
04h = CGA
05h = EGA
07h = MDA
08h = switchable LCD controller present
CH = 00h (reserved)
CL = switchable VDU mode supported
bit 0 = CGA supported
bits 1,2 = reserved (1)
bit 3 = MDA supported
bits 4-7 = reserved (1)
DH = internal monitor type
00h = none
01h = Dual-mode monitor
02h = 5153 RGB monitor
03h = Compaq Color monitor
04h = 640x400 flat panel
07h = LCD VGA
DL = external monitor type
00h = none
01h = dual-mode monitor
02h = 5153 RGB monitor
03h = Compaq Color monitor
04h = 640x400 flat panel
05h = VGC monochrome
06h = VGC color
----------10BF04-----------------------------
INT 10 - VIDEO - Compaq Portable Extensions - SET MODE SWITCH DELAY
AX = BF04h
BH = new state of delay
00h enabled
01h disabled
----------10BF05-----------------------------
INT 10 - VIDEO - Compaq Systempro Extensions - ENABLE/DISABLE DISPLAY
AX = BF05h
BH = new state of video
00h off
01h on
----------10BF06-----------------------------
INT 10 - VIDEO - Compaq SLT/286 - READ GRAY SCALE TABLE
AX = BF06h
CL = address to be read from grey scale table
Return: AL = bit 3-0 - Value read from grey scale table
CL = address to be read from grey scale table
----------10BF07-----------------------------
INT 10 - VIDEO - Compaq SLT/286 - WRITE GRAY SCALE TABLE
AX = BF07h
CH = value to write to grey scale table
CL = address to be written to grey scale table
----------10BF08-----------------------------
INT 10 - VIDEO - Compaq SLT/286 - WRITE COLOR MIX REGISTERS
AX = BF08h
CH = bits 7-4 - Green weight
bits 3-0 - Blue weight
CL = bits 7-4 - unused
bits 3-0 - Red weight
--------b-10BF09-----------------------------
INT 10 - VIDEO - Compaq LTE Lite - ENABLE ???
AX = BF09h
Return: CF clear
Note: sets bit 6 of port 03CEh index 81h; in some cases also sets index 84h
to 6Fh and index 83h to 04h
--------b-10BF0A-----------------------------
INT 10 - VIDEO - Compaq LTE Lite - DISABLE ???
AX = BF0Ah
Return: CF clear
Note: clears bit 6 of port 03CEh index 81h; in some cases also sets index 84h
to 80h and index 83h to FBh
--------b-10BF0B-----------------------------
INT 10 - VIDEO - Compaq LTE Lite - CHECK WHETHER ??? ENABLED
AX = BF0Bh
Return: CF clear
AX = state (0000h disabled, 0001h enabled)
----------10BF0C------------------------------------
INT 10 - VIDEO - Compaq QVision -
AX = BF0Ch
Clears I/O port 83C6h bit 1. Select 6bit DAC
----------10BF0D------------------------------------
INT 10 - VIDEO - Compaq QVision
AX = BF0Dh
Sets I/O port 83C6h bit 1. Selects 8bit DAC
----------10BF0E------------------------------------
INT 10 - VIDEO - Compaq QVision -
AX = BF0Eh
Return: AL = 00h if 6bit DAC
01h if 8bit DAC
----------10BF0F------------------------------------
INT 10 - VIDEO - Compaq QVision -
AX = BF0Fh
BX = HMA start address or 0FFFFh
Return: AX = HMA start address
----------10BF10------------------------------------
INT 10 - VIDEO - Compaq QVision -
AX = BF10h
Return: AX = HMA start address in ??
----------10BF11------------------------------------
INT 10 - VIDEO - Compaq QVision -
AX = BF11h
Return: AL = BFh
ES:SI ->
ES:DI -> COMPAQ text and date
----------10BFE0------------------------------------
INT 10 - VIDEO - Compaq QVision (later models ??)
AX = BFE0h