MEM 0040h:000Eh - BASE I/O ADDRESS OF FOURTH PARALLEL I/O PORTIBM PC Portable (uses same BIOS as XT) (pre-PS/2)
Size:	WORD
Notes:	zero if fewer than four parallel ports installed
	Under DR-OpenDOS 7.02+ this setting can be changed with the
	  undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.).	 Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated. CONFIG.SYS LPT4=(port_address|logical_no)[,[timeout]]
	  directive, where port_address = 200h..3FCh, logical_no = 0 or 1..3,
	  timeout=0..255 (default 20).  To avoid any interference with the PS/2IBM PS/2, any model
	  and later interpretation, this will be rejected if this entry does
	  not hold 0, which would indicate it is used for different purposes.
SeeAlso: MEM 0040h:0008h,MEM 0040h:000Ah,MEM 0040h:000Eh"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. DATA"
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0378h"PRINTER",INT 17/AH=00h