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