INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - ENTER MONOCHROME VGA MODE

	AX = 007Fh
	BH = 06h
Return: AL = 7Fh if successful (AT&T VDC600)
	BH = status (Paradise/Dell)
	    00h invalid function
	    7Fh successful
Note:	this function also switches to video mode 7
SeeAlso: AX=007Eh,AX=007Fh/BH=03h,AX=007Fh/BH=07h,AH=FFh"Oak"