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Sharp Compet 50 (CS-50A) Printing Desktop Calculator


The Sharp Compet 50, Model CS-50A

The Sharp Compet 50 Model CS-50A was Hayakawa Electric's first printing electronic calculator, utilizing a Shinsu Seiki-produced drum and hammer impact printer. The Compet 50 utilized similar electronics to the Sharp Compet 32 Nixie Tube display calculator, but replaced the Nixie Tube Display and decoder/driver circuitry with electronics to drive the printer. A two-digit Nixie tube display on the front panel of the calculator kept track of how many digits had been entered thus far. The calculator has a capacity of sixteen digits, and operates with a switch- selectable fixed decimal point location. Two full-capacity accumulator-style memory registers were provided, with indicators on the front panel that lit to show when a register contained a non-zero content. Magnetic core memory was used for storing the working registers of the calculator.

If you know of the whereabouts of one of these calculators in any condition please contact the Old Calculator Museum by clicking the EMail button above.