Sorry if this has been covered recently (did a search of old digests without a match). Are there any hidden gotcha's (other than the programming pulse width) with me using my PIC16C54A code on the '54B or '54C chips? (the 54B and 54C's are significantly cheaper) TIA Dave DSchmidt Technologies dschmidt@dschmidt.com http://www.dschmidt.com