MEM 0040h:0019h - KEYBOARD - ALT-nnn KEYPAD WORKSPACE                           
Size:	BYTE
Desc:	holds the current value of an Alt-NNN keypad sequence; when Alt is
	  released and this byte is non-zero, the appropriate character is
	  placed in the keyboard buffer
SeeAlso: INT 16/AH=00h,MEM 0040h:001Ah