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INT 10h, 1Bh (27) Return Functionality Information PS/2, VGA
This service returns information about the video equipment and state.
On entry: BX 0
ES:DI Address of Buffer to be filled
(see below)
Buffer contents:
Offset Means
------ -----
0 Offset of functionality information
2 Segment of functionality information
4 Video mode
5 Columns on screen
7 Length of regenerator buffer in bytes
9 Starting address of regenerator buffer
0Bh Cursor position for eight display pages
1Bh Cursor type setting
1Dh Active display page
1Eh CRT controller address
20h Current setting of 3x8 register
21h Current setting of 3x9 register
22h Rows on screen
23h Character height in scan lines
25h Display Code
26h Display Code (alternate)
27h Colors supported in current mode
29h Display pages supported
2Ah Scan lines in current mode
0 . 200 scan lines
1 . 350 scan lines
2 . 400 scan lines
3 . 480 scan lines
4 - 255 reserved
2Bh Primary character block
0 . block 0
1 . block 1
:
255 . block 255
2Ch Secondary character block
0 . block 0
1 . block 1
:
255 . block 255
2Dh State information
Bits 7, 6 reserved
Bit 5 = 0 . background intensity
1 . blinking
Bit 4 = 1 . cursor emulation active
Bit 3 = 1 . default palette loading diabled
Bit 2 = 1 . monochrome display attached
Bit 1 = 1 . summing active
Bit 0 = 1 . all modes on all displays active
2Eh Reserved
31h Video memory available
0 . 64K
1 . 128K
2 . 192K
3 . 256K
32h Save pointer state information
Bits 7, 6 reserved
Bit 5 = 1 . DCC extension active
Bit 4 = 1 . palette override active
Bit 3 = 1 . graphics font override active
Bit 2 = 1 . alpha font override active
Bit 1 = 1 . dynamic save area active
Bit 0 = 1 . 512 character set active
33h Reserved
3Fh End
---------------------------------------------------------------------------
This Service returns information about the current video state,
including most of the settings now active. The information returned by
this service is lengthy.
Service 1Bh is usually used only by operating system software. In most
cases, you can get the information you need with INT 10h service 0Fh,
return video state.
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