Is there a bug in gpsim that prevents TMR1 from counting when receiving pulses from a stimulus file? In this case, TMR1 has T1CON set to 7 which is un-synced external input from RB6, clock from RB6 and finally TMR1 is on. gpsim shows TMR1 as never counting although you see RB6 cycling high and low like it needs to in the project at hand. I can clear T1CON Bit 1 temporarily which switches the clock to the system and TMR1 counts. For those who have seen some of my other messages, I may, and I stress may, finally have a system that will run gnome. Gnome has a screen reader for computer users who are blind but the question to answer will be, "Does mplab-x's output play nicely with speech?" There's a lot of this stuff right now that doesn't but I will report if it works. It depends on how well the java works. Martin WB5AGZ --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .