INT 15 - SYSTEM - later PS/2s - LOCATE ROM BASIC

	AH = 22h
Return: CF set on error
	    AH = status (86h if function not supported)
	CF clear on success
	    AH = 00h
	    ES:BX -> ROM BASIC
Notes:	if this function is not supported, ROM BASIC is at F600h:0000h
	IBM classifies this function as optional
SeeAlso: INT 86"BASIC",INT F0"BASIC"