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**Sharp CS-10A "COMPET" Desktop Calculator**

Image Courtesy Nigel Tout

Photo Taken at London Science Museum

Sharp's (then known as Hayakawa Electric) first all-electronic calculator. Sharp's earlier calculators were desk-sized machines that utlized relays to perform calculations. The COMPET (which became the trade name for Sharp's future calculators) utilizes all Germanium transistor logic. Sharp's next calculator, the Compet 20 abandoned Germanium transistors in favor of more reliable Silicon-based transistors. The COMPET had an amazing twenty digit capacity, with ten digit entry via "full keyboard" like used in earlier electromechanical calculators. Rotary switch constant panel at front of machine, used for "dialing in" a constant value which can be recalled through a keyboard key. Nixie tube display, with discrete neon bulbs for decimal point indication. Modular design, with plug-in circuit cards for each digit, with additional plug-in cards for sequencing and control logic.

Manufacturer: | Sharp (Hayakawa Electric) |

Model Number: | Compet CS-10A |

Manufactured In: | Japan |

Date of Introduction: | June, 1964 |

Display Technology: | Nixie Tube, 20 Digits |

Discrete Neon-Tube decimal point indicators | |

Logic Technology: | Discrete Germanium Transistor |

Digits of Capacity: | 20 |

Decimal Modes: | Automatic Floating Decimal |

Math Functions: | Four Function |

Memories: | None |

Constant: | Rotary switch bank, 10 digits, keyboard recall |

Performance: | Addition: 12ms |

Subtraction: 16ms | |

Multiplication: 0.4s | |

Division: 0.8s |