In reply to Simo:
Hey, I went to last years do just before moving up to Vancouver Island - it was a 25th anniversary bash for the Xerox Alto as well and we had talks from folks that were at PARC at that time. The Alto pretty much counts as the first 'personal computer' and was the first machine most people ever saw Smalltalk on.
I was going to give my A500 to the museum but something happened to prevent it... can't even remember what now. Ah, come to think of it maybe it is because I can't find the keyboard/mouse anymore. Does anyone have spares - or wiring diagram for a later RPC or PS2 type?