The Jim Austin Computer Collection
mits altair 8800b
One of the first 'home' computers. It has to be built by hand.
This is in almost 'as new' condition and has the full manual which shows how to build it and how it works.
The system is based on the S100 bus (it defined the bus). In addition to the standard processor card and i/o cards it has:
Slot 1 (from bottom of picture below):
i/o card
Processor card.
16K MCS static RAM card.
16K plus SCP-16K Seattle Computer products memory card.
Digital Research 32K EPROM card (one EPROM installed).
Phantom D.R.C DALLAS memory card.
Tarbell electronics MD2022 - probably a disk controller
Dual channel RS232 interface computer pro.
There is loads of information on the web about this machine.