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INT 10 - VIDEO - FUNCTIONALITY/STATE INFORMATION (PS,VGA/MCGA)
AH = 1Bh
BX = implementation type
0000h return funtionality/state information
ES:DI -> 64 byte buffer for state information (see below)
Return: AL = 1Bh if function supported
ES:DI buffer filled with state information
Format of state information:
Offset Size Description
00h DWORD address of static funtionality table (see below)
04h BYTE video mode in effect
05h WORD number of columns
07h WORD length of regen buffer in bytes
09h WORD starting address of regen buffer
0Bh WORD cursor position for page 0
0Dh WORD cursor position for page 1
0Fh WORD cursor position for page 2
11h WORD cursor position for page 3
13h WORD cursor position for page 4
15h WORD cursor position for page 5
17h WORD cursor position for page 6
19h WORD cursor position for page 7
1Bh WORD cursor type
1Dh BYTE active display page
1Eh WORD CRTC port address
20h BYTE current setting of register (3?8)
21h BYTE current setting of register (3?9)
22h BYTE number of rows
23h WORD bytes/character
25h BYTE display combination code of active display
26h BYTE DCC of alternate display
27h WORD number of colors supported in current mode
29h BYTE number of pages supported in current mode
2Ah BYTE number of scan lines active
(0,1,2,3) = (200,350,400,480)
2Bh BYTE primary character block
2Ch BYTE secondary character block
2Dh BYTE miscellaneous flags
bit 0 all modes on all displays on
1 gray summing on
2 monochrome display attached
3 default palette loading disabled
4 cursor emulation enabled
5 0 = intensity; 1 = blinking
6 PS/2 P70 plasma display (without 9-dot wide font) active
7 reserved
2Eh 3 BYTEs reserved (00h)
31h BYTE video memory available
00h = 64K, 01h = 128K, 02h = 192K, 03h = 256K
32h BYTE save pointer state flags
bit 0 512 character set active
1 dynamic save area present
2 alpha font override active
3 graphics font override active
4 palette override active
5 DCC override active
6 reserved
7 reserved
33h 13 BYTEs reserved (00h)
Format of Static Functionality Table:
Offset Size Description
00h BYTE modes supported #1
bit 0 to bit 7 = 1 modes 0,1,2,3,4,5,6 supported
01h BYTE modes supported #2
bit 0 to bit 7 = 1 modes 8,9,0Ah,0Bh,0Ch,0Dh,0Eh,0Fh supported
02h BYTE modes supported #3
bit 0 to bit 3 = 1 modes 10h,11h,12h,13h supported
bit 4 to bit 7 reserved
03h 4 BYTEs reserved
07h BYTE scan lines supported
bit 0 to bit 2 = 1 if scan lines 200,350,400 supported
08h BYTE total number of character blocks available in text modes
09h BYTE maximum number of active character blocks in text modes
0Ah BYTE miscellaneous function flags #1
bit 0 all modes on all displays function supported
1 gray summing function supported
2 character font loading function supported
3 default palette loading enable/disable supported
4 cursor emulation function supported
5 EGA palette present
6 color palette present
7 color paging function supported
0Bh BYTE miscellaneous function flags #2
bit 0 light pen supported
1 save/restore state function 1Ch supported
2 intensity blinking function supported
3 Display Combination Code supported
4-7 reserved
0Ch WORD reserved
0Eh BYTE save pointer function flags
bit 0 512 character set supported
1 dynamic save area supported
2 alpha font override supported
3 graphics font override supported
4 palette override supported
5 DCC extension supported
6 reserved
7 reserved
0Fh BYTE reserved
See Also:
1015
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