At 10:40 AM 8/20/02 -0700, you wrote: > >Of course how do you know then that the ROM holding the checksum algorithm > >didn't flake out and cause the routine to report everything is OK? An 8-bit checksum has a 1 in 256 chance of giving a false "okay" anyhow. But that is 256 times better than not checking at all. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com 9/11 United we Stand -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads