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Side note: In the 1990s, everyone in my engineering school had an HP48 calculator. There were a healthy selection of pretty decent games available.

One fine day, I finished my physics exam an hour early and so opened up an enjoyable game on my calculator. 45 minutes went by and so I went up and handed in my paper. It was at this point that the professor noted, “were you planning on leaving the second page blank?”

Oh.

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I had an HP48, I had lots of fun with Bjorn Gahm's IR remote control which could mimic the remote control signals of most common television brands, including the ones at my high school. The HP48 also had the ability to set an alarm to execute an arbitrary piece of code, e.g. turning on the TV to some channel and turning the volume up to max at some predefined time the middle of class.

Teachers were completely stumped. Their initial suspicions were always that someone brought a universal remote control to class, but they would painstakingly search everyone's desks to find nothing. And then after asking everyone to put their hands up in the ai, the TV would still have a mind of its own.

Yeah, your TI-89 was no fun.

Still have mine. For a while on my phone I used an emulator. Eventually I found PCalc and it was customizable enough to recreate the parts of the hp48g that I cared about on a day-to-day basis.

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