[Piotr Patek] ran into this issue when he obtained an Elektronika MK-85 programmable calculator with a broken CPU. Unable to find a replacement, he decided instead to build a pin-compatible CPU ...
Parents bought new toys that offered both instruction in arithmetic and other games for their children. A few calculators were programmable, offering an alternative to large computers and to the ...
calculators continued to gain functionality. In 1974, HP came out with their first programmable calculator, the HP-65. It had 100 functions and stored programs with a magnetic card reader.
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