INT 0x10 - 0x1b - Video BIOS Functionality and State (PS,VGA/MCGA)

Request/Call:

reg	value	descr
AH	0x1b
BX	0x00	implementation type (must be zero)
ES:DI	ptr	pointer to 64 byte buffer

reg	descr
AL	0x1B
ES:DI	pointer to updated buffer (see below)

offset	size	Descr.
00	dword	address of static funtionality table (see static table below)
04	byte	video mode (see info 1 below)
05	word	number of columns
07	word	length of displayed video buffer (# bytes)
09	word	start address of upper left corner of video buffer
0B	16 bytes	cursor position table for 8 pages (col,row)
1B	byte	cursor end line
1C	byte	cursor start line
1D	byte	active video page
1E	word	I/O port for CRTC address register
20	byte	current value of CRTC 3×8 register
21	byte	current value of CRTC 3×9 register
22	byte	number of displayed character rows
23	word	height of character matrix (points)
25	byte	active display combination code
26	byte	inactive display combination code
27	word	number of displayed colors (mono = 0)
29	byte	number of supported video pages
2A	byte	raster scan lines 0=200, 1=350, 2=400, 3=480
2B	byte	text character table used
2C	byte	text character table used
2D	byte	other state information (see info 2 below)
2E	3 bytes	reserved (00h)
31	byte	video RAM available 0=64K, 1=128K, 2=192K, 3=256K
32	byte	save area status (see info 3 below)
33	dword	reserved (00h)

Offset	Size	Description
00h	BYTE	modes supported #1 bit 0 to bit 7 if set : modes 0,1,2,3,4,5,6 supported
01h	BYTE	modes supported #2 bit 0 to bit 7 if set : modes 8,9,0Ah,0Bh,0Ch,0Dh,0Eh,0Fh supported
02h	BYTE	modes supported #3 bit 0 to bit 3 if set : 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 bit 1 gray summing function supported bit 2 character font loading function supported bit 3 default palette loading enable/disable supported bit 4 cursor emulation function supported bit 5 EGA palette present bit 6 color palette present bit 7 color paging function supported
0Bh	BYTE	miscellaneous function flags #2 bit 0 light pen supported bit 1 save/restore state function 1Ch supported bit 2 intensity blinking function supported bit 3 Display Combination Code supported bit 4-7 reserved
0Ch	WORD	reserved
0Eh	BYTE	save pointer function flags bit 0 512 character set supported bit 1 dynamic save area supported bit 2 alpha font override supported bit 3 graphics font override supported bit 4 palette override supported bit 5 DCC extension supported bit 6 reserved bit 7 reserved
0Fh	BYTE	reserved

bit	descr
0	1 = all modes active (MCGA always 0)
1	1 = gray scale summing enabled
2	1 = monochrome display attached
3	1 = default palette loading disabled
4	1 = cursor emulation enabled
5	1 = blinking attribute enabled
6	1 = PS/2 P70 plasma display (without 9-dot wide font) active
7	1 = reserved

bit	descr
0	1 = two text char sets are active
1	1 = dynamic save area is active
2	1 = text char set override is active
3	1 = graphics char set is override active
4	1 = palette override is active
5	1 = display combination code ext. active
6-7	reserved

returns static and dynamic information about the current state and capabilities of the current video system
bytes 0-3 of the dynamic data table at ES:DI contain a far pointer to the video static information table