Hi. I think that : > there's a message (310) > ......P18F452.INC 1495 : Superceding current maximum RAM and RAM map. is the key here. Check your RAM allocation and mapping. And the compiler listings file. You are correct that the linker does produce a (more or less) empty and useless MAP file in cases like this... Jan-Erik. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body