Hi, When you program a PIC18F452 the RB5 pin needs to be grounded, but is that also the case when you program it in system via a 5-pin header (MCLR, Vdd, gnd, RB6 & RB7)? Anthony Website: http://members.lycos.nl/anthonyvh --------------------------------- Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! _______________________________________________ http://www.piclist.com View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist