Does anybody know what the limits are for a pin stimulus (.sti) file under MPSIM? I have a file containing 3618 lines and controlling 3 pins. The total length of the file is 52012 bytes. Whenever I attempt to load this file into MPLAB the program hangs. Bob Ammerman RAm Systems (contract development of high performance, high function, low-level software) -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics