Hi Adam: I tried a couple of your ideas with no luck. But then started making measurements of the clock signal to see how big it was and found it to be much less than 5 and more than 0 volts and so started looking at the code. The problem was setting the bits that control the LEDs prior to the TRIS command. Once I modified the code all is well. Thanks for getting looking in the right place. Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist