Interrupt 67h	Expanded Memory Specification
Function  6Ah	System Map Functions
SubFunc   00h	Get System Map
entry	AH	6Ah
	AL	00h
	CH	First Window
	CL	Window Count
        ES:DI   Pointer to empty array
return  AH      status (see Int\67f\40)
		00h	Function Successful
		ES:DI	Pointer to saved page map array