Well, as those of you have been following my hardware hacking blog know, I stopped my upgrade work on the 800 because the keyboard wasn't working and I thought I had done something to the POKEY or 4051 IC's which handle it. After extensive trouble shooting and replacement of those IC's and lots of tracing circuits with my multimeter to figure out what went wrong, I have finally discovered that NOTHING went wrong with the upgrades and working on the motherboard itself. It all tests good either in stock configuration or with the Incognito plugged in, it works. Except for the keyboard. When I was replacing plungers on the keys to fix it, I noticed about half a dozen cold/cracked solder points on the bottom side of the keyboard, so I resoldered them to fix them. Even though the keyboard was fully working before, I suspected those keys would stop working soon. Well, some how I killed the keyboard when I did it. I don't know how, as it's a very simple circuit with only traces and jumpers on the keyboard itself, and all the IC's that make it work are on the motherboard, so I'm not sure what went wrong. The problem is, with this Hi-Tech brand keyboard, there is no way to open it up without probably destroying it anyway. The plastic part that the plungers and keycaps are attached too doesn't seem to have anyway to come off the circuit board except by desoldering the entire circuit board and then pulling it off. Which I may have to do, as nothing on the bottom side or with the keys themselves seems to be wrong, it just won't work at all, well, except for the BREAK key. It's the only key (besides the function buttons which are on a different circuit) that works. I checked into getting another keyboard for it, but the only place that has one for sale is B&C Computervisions (MyAtari on Ebay) and they want $100 for it! I can buy an entire new motherboard for $40! So I wish now I had broken the motherboard as it would have been cheaper to replace! Does anyone here have any experience working with these 800 Hi-Tech keyboards? It's such a shame as the keys all work nicely now with all good plungers, no cracked corners! I suppose I should try to find an 800 Matsumi keyboard, that they started using in later years, like on the 1200XL, they are wonderful, but apparently they are ultra rare as only about 1-2% of 800's had these installed at the end of the 800's production run.