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I had the Casio fx-780P. It was a piece of junk, even by the standards of the day.

Yet people love them, especially the PC-6. It has to be the form factor.

Meanwhile, my PC-4 (Casio PB-100) was far more useful to me and they seem much more durable.

The form factor is not that great. Much later I got a HP95LX then a HP200LX, which were genuinely useful machines.