Just to follow-up on a message from way back, I saw some Motorola XC6800 parts in a prototype board today. There was an XC6800 CPU (with clock module) and two XC6820 parallel port chips. The "XC" prefix, it seems, was a Motorola prefix for early pre-production parts. The date codes were from 1975. -- John Honniball coredump(a)gifford.co.uk