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 Shinshu Seiki (later
known as EPSON)-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.