Greetings: Thanks to all who responded to my question concerning labeling the port and pin to use in asm. I had tried the #define command with no luck. Seems that MPALC does not accept #define but MPASM does. Now to complicate things MPASM is not compatible with the Parallax Simulator that I have ver. 2.01. and I do not have enough time to wade through MPSIM. Once again thanks to all. Joseph D. West Electronics Lab. Supervisor College of Mechanical Eng. Ohio State University (614) 292-2845 Fax (614) 292-3163