INT 15,88 - Extended Memory Size Determination

	AH = 88h

	on return:
	CF = 80h for PC, PCjr
	   = 86h for XT and Model 30
	   = other machines, set for error, clear for success
	AX = number of contiguous 1k blocks of memory starting
	     at address 1024k (100000h)

	- works only on 80286 and 80386 machines
	- retrieves bytes 30 and 31 from the CMOS RAM (this data is set
	  by the boot memory scan