Adrian Clinciu writes: >I'm working with MPLAB under Win 3.1 to simulate a PIC16C84. When I >use pulseasynchronous stimulus the white window comes and says "MPLAB >caused a General Protection Fault in module SM16C84.DLL at...". The >high, low and toggle types work fin. Can anyone tell me what it's >wrong? Adrian, You are the second person to run across this. It is a true bug, and is related to the "Pulse" setting on the Asynchronous stimulus dialog. If you use other settings, this will not happen, so for the meantime avoid the "Pulse" setting. An update will be posted in the near future. Darrel Johansen