MEM 0040h:006Bh - CASSETTE (PCIBM PC only) - LAST VALUE READ FROM CASSETTE
Size:	BYTE
SeeAlso: MEM 0040h:0069h"CASSETTE",INT 15/AH=02h
                                                                                

MEM 0040h:006Bh - POSTsee Power-On Self-Test LAST UNEXPECTED INTERRUPT (XTIBM PC XT and later)
Size:	BYTE
Desc:	this is a bitmask of IRQs which have occurred while the corresponding
	  interrupt vector points at the default system BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. handler
	  (bit 0 = IRQ0 to bit 7 = IRQ7; bit 2 = IRQ8-15 on ATIBM PC AT and later)
SeeAlso: INT 0F"IRQ7",INT 70"IRQ8",INT 77"IRQ15"