I suppose I'll be sorry for this, but I want to mention that one of the
hardest to find early 6502 systems just showed up on eBay: the PAiA 8700.
But it wasn't on the vintage list; it was on the music instrument category.
Most of these were built into keyboards. I've been looking for one of these
for 5 years and only seen 3 of tem on eBay. Always get outbid. Had to stop
bidding on this one at $93..
Anyway, if anyone else wants one for their collection, take a look at this:
110079964730
You can see the keyboard and the display in one picture. The description
gives it away.
So if you are looking for these, do a search pointed to midi keyboards or
PAiA.
Billy