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context: This is an Apple /// computer, built in 1980. It was originally owned by my colleagues father, who used it to run his architecture business in Canada before it was finally packed away sometime in the early 1990’s. This machine (and a second one!) plus a ton of accessories, software and manuals were recently donated to me for my “Retro Roadshow” events (free, hands-on ‘pop-up museums’ my family and I host around the San Francisco Bay Area).
  The Apple /// was a very advanced workstation in its day, and was carefully designed to appeal to business users rather than the home users / consumers / students which Apple was mostly known for.
  Unfortunately, the Apple ///’s launch in 1980 was immediately derailed by technical problems (the machines were very prone to overheating), forcing an immediate recall of the first \~14,000 machines sold. This problem combined with some strange limitations in its design badly damaged its reputation, and the system was quietly discontinued a few years later after totally failing to thrive in the world of business computing.
  Because it was such a massive flop, the Apple /// is pretty rare today, and it’s a weird and interesting machine to play with. Here’s one example of how quirky it is: the arrow keys on the keyboard are ‘pressure sensitive’ - you can press them lightly to move the cursor slowly, or press them harder (you’ll feel a slight ‘click’) and the cursor moves faster. It's also the only computer keyboard I've ever used that totally lacks a Delete / Backspace key. Very strange layout! Here's the Deskthority page on this keyboard.