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Programmable calculator

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Programmable calculators are calculators that can automatically carry out a sequence of operations under control of a stored program. Most are Turing complete, and, as such, are theoretically general-purpose computers. However, their user interfaces and programming environments are specifically tailored to make performing small-scale numerical computations convenient, rather than general-purpose use.

A TI-59 with a magnetic storage card being inserted into the card reader on the side.

HP-41CX with magnetic card reader and thermal printer

A complete range of programmable calculators were developed in former USSR. Some of them (like this MK-52), was used even in space missions.

SwissMicros replica of the HP-15C in credit card size

Calculator

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An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics.

An electronic pocket calculator with a seven-segment liquid-crystal display (LCD) that can perform arithmetic operations

Scientific calculator displays of fractions and decimal equivalents

The interior of a Casio FX-991s calculator

An office calculating machine with a paper printer