◄Summary► ◄Notes► ◄Back► ────────────────────────────────────────────────────────────────────────────── The caller's buffer is filled in with information that depends on the current video display mode: Byte(s) Contents ═══════ ════════════════════════════════════════════════════════════ 00H-03H pointer to functionality information (see next Note) 04H current video mode 05H-06H number of character columns 07H-08H length of video refresh buffer (bytes) 09H-0AH starting address in buffer of upper left corner of display 0BH-1AH cursor position for video pages 0-7 as eight 2-byte entries; first byte of each pair is y coordinate, second byte is x coordinate 1BH cursor starting line 1CH cursor ending line 1DH active display page 1EH-1FH adapter base port address (3BXH monochrome, 3DXH color) 20H current setting of register 3B8H or 3D8H 21H current setting of register 3B9H or 3D9H 22H number of character rows 23H-24H character height in scan lines 25H active display code (see Int 10H Function 1AH) 26H inactive display code (see Int 10H Function 1AH) 27H-28H number of displayable colors (0 for monochrome) 29H number of display pages 2AH number of scan lines 00H=200 scan lines 01H=350 scan lines 02H=400 scan lines 03H=480 scan lines 04H-FFH=reserved 2BH primary character block (see Int 10H Function 11H Subfunction 03H) 2CH secondary character block 2DH miscellaneous state information Bit(s) Significance ══════ ═══════════════════════════════════════════ 0 =1 if all modes on all displays active (always 0 on MCGA) 1 =1 if gray-scale summing active 2 =1 if monochrome display attached 3 =1 if mode set default palette loading disabled 4 =1 if cursor emulation active (always 0 on=MCGA) 5 =state of I/B toggle (0=intensity, 1=blink) 6-7 =reserved 2EH-30H reserved 31H video memory available 00H=64 KB 01H=128 KB 02H=192 KB 03H=256 KB 32H save pointer state information Bit(s) Significance ══════ ════════════════════════════════════ 0 =1 if 512-character set active 1 =1 if dynamic save area active 2 =1 if alpha font override active 3 =1 if graphics font override active 4 =1 if palette override active 5 =1 if display combination code (DCC) extension active 6-7 =reserved 33H-3FH reserved Bytes 0-3 of the caller's buffer contain a DWORD pointer (offset in lower word, segment in upper word) to the following information about the display adapter and monitor: Byte(s) Contents ═══════ ════════════════════════════════════════════════════════ 00H video modes supported Bit(s) Significance ══════ ════════════════════════ 0 =1 if mode 00H supported 1 =1 if mode 01H supported 2 =1 if mode 02H supported 3 =1 if mode 03H supported 4 =1 if mode 04H supported 5 =1 if mode 05H supported 6 =1 if mode 06H supported 7 =1 if mode 07H supported 01H video modes supported Bit(s) Significance ══════ ════════════════════════ 0 =1 if mode 08H supported 1 =1 if mode 09H supported 2 =1 if mode 0AH supported 3 =1 if mode 0BH supported 4 =1 if mode 0CH supported 5 =1 if mode 0DH supported 6 =1 if mode 0EH supported 7 =1 if mode 0FH supported 02H video modes supported Bit(s) Significance ══════ ════════════════════════ 0 =1 if mode 10H supported 1 =1 if mode 11H supported 2 =1 if mode 12H supported 3 =1 if mode 13H supported 4-7 =reserved 03H-06H reserved 07H scan lines available in text modes Bit(s) Significance ══════ ════════════════════ 0 =1 if 200 scan lines 1 =1 if 350 scan lines 2 =1 if 400 scan lines 3-7 =reserved 08H character blocks available in text modes (see Int 10H Function 11H) 09H maximum number of active character blocks in text modes 0AH miscellaneous BIOS capabilities Bit(s) Significance ══════ ══════════════════════════════════════ 0 =1 if all modes active on all displays (always 0 for MCGA) 1 =1 if gray-scale summing available 2 =1 if character font loading available 3 =1 if mode set default palette loading available 4 =1 if cursor emulation available 5 =1 if EGA (64-color) palette available 6 =1 if color register loading available 7 =1 if color register paging mode select available 0BH miscellaneous BIOS capabilities Bit(s) Significance ══════ ════════════════════════════════════════ 0 =1 if light pen available 1 =1 if save/restore video state available (always 0 on MCGA) 2 =1 if background intensity/blinking control available 3 =1 if get/set display combination code available 4-7 =reserved 0CH-0DH reserved 0EH save area capabilities Bit(s) Significance ══════ ══════════════════════════════════════ 0 =1 if supports 512-character sets 1 =1 if dynamic save area available 2 =1 if alpha font override available 3 =1 if graphics font override available 4 =1 if palette override available 5 =1 if display combination code extension available 6-7 =reserved 0FH reserved -♦-