INT 10 - Direct Graphics Interface Standard (DGIS) - INQUIRE AVAILABLE DEVICES
AX = 6A00h
BX = 0000h
CX = 0000h
DX = buffer length (may be 0)
ES:DI -> buffer
Return: BX = number of bytes stored in buffer
CX = bytes required for all descriptions (0 if no DGIS)
Note:   buffer contains descriptions and addresses of DGIS-compatible
display(s) and printer(s)

See also: 106A02

106A00BX0000 - Direct Graphics Interface Standard (DGIS) - INQUIRE AVAILABLE DEVICES