I had the Casio ML-81 as a kid! I found that by entering 951 then taking the square root, it did play a nice little melody, and playing the square root of that would play an interesting second part. Then it got random after that. I knew Kraftwerk Autobahn and Radioactivity by then, but I think it was before Computer World and Pocket Calculator came out.
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When I was a senior in high school, my dad gave me a nifty scientific and stats calculator made by Novus that used Reverse Notation. (i.e. 1 enter 5 plus 6). No one ever asked me to borrow it. 
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