28.

TI-99/4A.

Which, by the way, had one of the worst UI bugs ever. The keyboard had a ``FCTN'' key, which worked as a bucky-key of a nature. One of it's functions was to press FCTN-= to reset the computer (basically Ctrl-Alt-Del). The ``FCTN'' key was right next to the shift key, which was the size of a normal letter key, not the double-to-triple width as on most modern keyboards. The ``FCTN'' key was also small. This combination meant that if you were typing fast, and screwed up typing a ``+'' and missed the shift key by a little, you reset the entire computer. I started saving my little BASIC programs about every five lines of code that I typed in.
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Bitt Faulk