Hi all, These PICs have 2 extra parity bits in the ROM words. To set the parity bits: I assume for EVEN parity bit, you add up all the '1' bits, ODD result -> Parity = 1 EVEN result -> Parity = 0 I assume for ODD parity bit, you add up all the '1' bits, ODD result -> Parity = 0 EVEN result -> Parity = 1 EVEN parity is performed on all EVEN bit numbers. ODD parity is performed on all ODD bit numbers. Is this correct?? TIA Tony -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu