INT 2F - Kingswood ANSI display driver - SET COMPATIBILITY MODE                 
	AX = 3912h
	BL = 03h
	CL = new mode (00h fast, FFh BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly.)
Return: AL = old compatibility mode
	SI,DI,DS,ES preserved
SeeAlso: AX=3900h,AX=3912h/BL=04h