Alan Cave wrote: >> Hex 378 is the usual address for a modern computer's LPT1 Hi Alan It is always best to get the address of LPT1, LPT2, or LPT2 *programatically* -- you really cannot rely on this assumption. This can be done easily with the 'peek' command at the BIOS addresses listed in my post. (Just remember little-endian byte ordering.) Best regards, Ken Pergola -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body