EDID

Extended Display IDentification is data about the monitor, which the monitor provides to the video card. EDID is the programmatical way to check if a video mode is supported. However, this procedure is rather complex. (See VBE.)

Reading EDID

The first step is, naturally, to actually get the data. This is done through the BIOS - int 0x10, ax=4F15h, bl=01h.

mov ax, 0x4f15
mov bl, 0x01
mov cx, 0
mov dx, 0
int 0x10
;AL = 0x4F if function supported
;AH = status (0 is success, 1 is fail)
;ES:DI contains the EDID

Note that this code will only run in Real Mode or Virtual 8086 Mode.

EDID Data

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