AEHR / Computest CPM computer?

I picked up a portable computer since it had a disk in it that said CPM. I can't get it to boot but it looks interesting so I thought I'd try to find ut more about it before I decide to fix or junk it. The computer is labeled "AEHR Test System ATS-312". It's about 1 foot tall x 1 foot wide x 26 inches deep. It has a keybord that folds down from the front and exposes two 5 1/4" disk drives and a built in CRT. Inside most of the cards are marked "Computest Inc Made in USA" but the motherboard is marked "Fox Motherboard II". A couple of the plug in cards init are marked "64 point switchboard II" and have 64 pin ribbon cable sockets on the back. Underneath it has what looks like the CPU card. On it has what I think is the CPU. It's hard to read but it looks like it says "SGS Z84008B-1". Is anyone familar with that chip? I can't find any record on it. Does anyone know anything about the computer itself? AEHR makes test equipment, mainly for IC wafer testing. I couldn't fin anything out about Fox or Computest. They're both common names but all the occurances that I cound find were for unrelated businesses. Joe