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Re:Free42: An HP-42S Calculator Simulator (2005) by goatinaboat on Monday September 23, 2019 @01:22AM (#21046131)
Second, without physical buttons it is a lot harder to operate without looking.

The third is all the distractions of a modern phone.

The combination of textbook, notepad and pencil, and calculator, is perfect for deep study of a complex topic.

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