INT 10 - Chips & Technologies Extended BIOS - GET SUPERVGA STATE BUFFER SIZE

	AX = 5F90h
	CX = state mask (see #00185)
Return: AL = 5Fh if function supported
	    BX = number of 64-byte blocks required
SeeAlso: AH=1Ch,AX=5F03h,AX=5F91h,AX=5F92h,AX=5FA0h