MEM 0040h:000Ch - BASE I/O ADDRESS OF THIRD PARALLEL I/O PORTIBM PC Portable (uses same BIOS as XT)
Size:	WORD
Notes:	zero if fewer than three 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 LPT3=[port_address|logical_no][,[timeout]]
	  directive, whereby port_address = 200h..3FCh, logical_no = 0 or 1..3,
	  timeout=0..255 (default 20).
SeeAlso: MEM 0040h:0004h,MEM 0040h:0008h,MEM 0040h:000Ah,MEM 0040h:000Eh
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0378h"PRINTER",INT 17/AH=00h