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)
SeeAlso: AX=6A02h