Does anyone have the format of the async stimulus file? I'm having trouble trouble using them, I have the pin stimulus working and its ok for now but I really would prefer to use the async method. Here is an example of what I want to do: PIN 7 is an input from a debounced switch. I want to test out my ISR which is being triggered by PIN 7. What do I need to do using the ASYNC Stimulus the trigger an input. BTW I tested my code with the pin stimulus and it does work. Lastly does anyone have any idea as to why my messages show up as From: Undetermined origin c/o LISTSERV administrator ? -- Neil Cherry If you need to contact me via email please use this email address to respond: ncherry@worldnet.att.net