I've seen his hardware,and an Apple 2 runs the whole thing. This site also includes pointers to disk images,so you can play Defender on your Pentium or Power Mac. Dump some political speeches in the energy conversion device,fire up the flux capacitor,and away you go. Hardware Notes Items 2 and 3 plus an external modem and cable are essential hardware for using your Apple or compatible as a dumb terminal. I bought my cards used,with no documentation.
Information below is mainly off the net,for the convenience of others in the same situation.
Here in Edmonton, Denis Fafard has an impressive collection of Apple stuff and occasionally sells some of it so might be a good contact. If you're not in Edmonton,check the web pages and newsgroups below. Parallel Card Settings Printer interfacing to MX-80's ,etc. The 80 Column Card makes your display look like a real computer. If you connect to a unix host, you may be able to browse the web with thelynx text-only browser.