Without seeing pictures, it sounds like a Commodore
B-128 (the business end
of Commie's computer line) - it was the predecessor of the C-128 - it was
6509-based, with a header to add the Z-80 coprocessor board - they were in
production, but I don't know for how long, or how many were made...
An interesting thing about the B-128... A large user group formed around
the machine and when Commodore axed it, the user group sued them (and
won!) getting all the schematics, designs & chip masks so they could
continue to maintain their machines. This is what I _heard_ happened, so
you might want to check with Cameron Kaiser(sp?) to find out for sure.
He's be the definitive source on this.
g.