MEM 0040h:007Fh - SERIAL DEVICE 4 TIMEOUT COUNTER                               
Size:	BYTE
Note:	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 COM4=[port_address|logical_no][,[timeout]]
	  directive, whereby port_address = 200h..3F8h, logical_no = 0 or 1..4,
	  timeout=0..255 (default 1).
SeeAlso: MEM 0040h:0006h,MEM 0040h:007Ch,MEM 0040h:007Dh,MEM 0040h:007Eh
SeeAlso: INT 14/AH=01h