The Circuit is so simple that the most likely problem would be the power supply, as the error failed at 0000. expected 3000, found 3fff. means unprogramed address was returned. Art ;-) ----- Original Message ----- From: yansong gu To: Sent: Sunday, May 21, 2000 3:17 AM Subject: nopp I just tested my home made nopp. With all the excitement I loaded the Demof84.hex(led chaser), it some how returned an error when I tried to verify the program. The message is: failed at 0000. expected 3000, found 3fff. I tested the programmer before I put in the chip16F84A-20I/P and it was fine. can any one tell me what's going on ? Your help is greatly appreciated! YG