Category: video
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS, EGA, VGA, MCGA) - GET EGA INFO AH = 12h BL = 10h Return: BH = video state 00h color mode in effect (I/O port 3Dxh) 01h mono mode in effect (I/O port 3Bxh) BL = installed memory (00h = 64K, 01h = 128K, 02h = 192K, 03h = 256K) CH = feature connector bits (see #00022) CL = switch settings (see #00023,#00024) AH destroyed (at least by Tseng ET4000 BIOS v8.00n) Note: one possible check for the presence of an EGA or later display card is to call this function with BH=FFh; if not present, BH will be unchanged on return another installation check is used by Athena Digital's HGCIBM, which sets CX to FFFFh on calling and checks whether it has been changed on return Index: installation check;EGA