The Micro-Expander Model 1 is a Z80-based S-100 bus computer system. Extremely rare computer. Only 200 ever made. This particular computer has 64Kcard expansion card. An 8K expansion card and a relay card. The gentlemen whom this computer came from bought the computer directly from Manu tronics (Chicago,IL) after they clearenced out the only small run of 200 ever made after their financier fell through on the deal. I have no idea if it actually works. I have never plugged it in. It uses a composite video output. INCLUDED: computer, original manual, power supply. Here is a snippet of an interview that was done with it's designer Lee Felsenstein: Berkeley, CA, circa 1980 ...I took on a walk-in client, a Swedish guy, who wanted to design and build something that looked like an Apple II, but ran CP/M, had a Z-80 in it, and would also handle Radio Shack graphics. I should point out that by the fall of 1977, the SOL design was imitated fairly well by the Radio Shack TRS-80 Model I, although it didn't use an S-100 bus. It used dynamic memory for storage and, I think, static memory for the display, but it was the same memory space, which was important, because they were still doing a basic memory access to get something on the screen. John French, who designed that - if I'm remembering his name correctly - credits the SOL as his inspiration, and I'm happy enough with that. That's what happens when you do a design that has legs. So Radio Shack-style graphics were one thing this Swedish guy, Mats Ingemanson, wanted to include along with color - European color, PAL. We called the computer the Expander. I bashed my way through that. Eventually I charged too little money for it and turned it over to Bob Marsh to try to get it into production. About 200 of them were produced, but they were never paid for, so only a couple of them got out and I don't know that the European color on it ever really worked.