someone here might find this site interesting. it's mostly apple and xerox with pre evil-empire microsoft, altair and others thrown in.DigiBarn
Very nice. Another one (HP, but NOt calculators) that is very helpful for old HP instruments:
http://hpmuseum.net/
TomC
While not about calculators if you look around you there is information about the 71B 75C/D and the HPIL peripherals.