Hi again... I've run few test with a F88. I used b818-1.hex and b818i- 1.hex from Wouters blink-a-LED page. Both re-programs fine on a F88... B818i-1.hex is supposed to use both intosc and int-MCLR. I expected b818i-1.hex to show the reprogramming issues of other int-MCLR chips... I'm as lost as usualy... :-) Regards, Jan-Erik. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist