On Thu, Sep 27, 2012 at 11:24 AM, Dave Caroline <dave.thearchivist at gmail.com> wrote: That's very interesting. I started on a chicklet keyboard PET at the public library, but by the time I'd saved up enough to get my own (with matching contributions from my mother), the current models were the BASIC 2.0 16K and 32K 2001s (same as the 3016 and 3032 in Europe), so I never had to "upgrade" mine. I did, however, for the experimental value, completely deconstruct what was formerly an airline reservation terminal keyboard with individual switches and wire up my own grid. It's been a lot of years, but my fuzzy memories tell me I made a hex keypad for the User Port out of the parts I stripped from the original keyboard. It worked electrically but the keys were sculpted based on what row they came from, so a 4x4 grid of keys from different rows didn't look so nice and was slightly difficult to type quickly on. I don't recognize your upper row of keys except that the yellow ones remind me of that airline reservation terminal with column and field navigation keys. -ethan