[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 ...

Back in the day, your choice of calculator said a lot about your chops, and nothing made a stronger statement than the legendary Hewlett-Packard Voyager series of programmable calculators.