Casio Advert - February 1983

Casio's PB-100 was one of several small "pocket computers" released around the same time that look more like calculators, however it was programmable as it had a resident version of BASIC capable of storing up to 1,568 steps, once its memory had been upgraded.

It was also sold by Tandy as its PC-4 in one of a series of similar machines built for it by either Sharp or Casio, starting with the Sharp PC-1211, a.k.a the PC-1.

The PB-100 retailed for £59.95, or around £250 in 2024, which was cheap for a computer, although somewhat expensive for a calculator.