Jay West wrote: I have the sad carcass of a possibly restorable 990/4 CPU, sold as a mini, but based on the TMS9900 and not terribly well-built. (The front panel switches are calculator buttions using the same collapsing dome technology as the old TI-30 calculator I used to own, and have gone bad in the same way the calculator keys did.) I don't recognize these boards from the numbers, but I was hoping they would either match this machine as spares, or perhaps would serve as bait to bring a nicer 990 my way. ;) Architecturally, the TI990/TMS9900 is interesting, but the TI99/A home computer was an abominably bad design and I can't bring myself to own one. I mostly avoid micros, but I do have a weakness for blinkenlights front panels wherever they are found. :) --Bill