I have built the PIC interface according to the doc in the FMS install directory. It's not working properly though, and I have a question for PIC guru's: as far as I can remember, the Port A lines on a 16C/F84 don't have internal pull-ups (only Port B lines do, if configured properly). The original schematics doesn't contain an external pull-up resistor on RA4. When I look at RA4 with a scope (serial port connected, FMS started, the PIC is powered OK), I can't get any signal, that's why it's not functionning. I think it needs an external pull-up resistor.
What gives?