Hello, I can't seem to get a stim file to work with a 12C509 in MPLAB 6.31. I have done this before on another machine without problems and now I don't see any changes in my I/O register. Anyone have a suggestion? Thanks, Ben ! ! Serial Input @ 2400 bps Test ! Bits are sent 0, 1, 2, 3, ... STEP GP3 1 1 500 0 917 1 1333 1 1750 0 2167 1 2583 0 3000 1 3417 0 3833 0 4250 1 4667 0 5083 1 5500 0 5917 0