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Litronix Checkmate

Checkmate version1

Version 1, with "Klixon" keypad.

Checkmate version2

Version 2, with keypad from Wild Rover Corp.

Litronix Checkmate

Distinctive features: One of the first models of calculator made by Litronix, like Bowmar, a manufacturer of LED (Light-Emitting Diode) displays which moved into making the complete calculator.

Technical details:
Display is 8 digits, red LED, with fixed decimal point, switchable between 2 and 4 places of decimals.


Rechargeable batteries.

Main integrated circuit is a LIT-019 (manufacturer unknown), here date coded 1973.

Checkmate version 1 has the high-quality Texas Instruments "Klixon" keypad, whereas version 2 has a somewhat cheaper keypad from Wild Rover Corp..

78 x 137 x 37 mm (3.1" x 5.4" x 1.5").


Litronix Inc., Cupertino, California, U.S.A.

The electronics of the version 1 and the version 2 models is identical. Since the version 2 model does not have the Litronix name on it and has a cheaper keypad, Ball & Flamme[1] suggest that  it may have been made by Litronix for another company to market.

Note that on the version 1 calculator displayed someone has engraved a security number "H58359" below the display and near the decimal position selector switch - calculators were expensive items at the time!

Circuit board
Circuit board

With the casing removed, showing the identical circuit boards of a type 1 version (on the left) and a type 2 version (on the right). The white and gold calculator integrated circuit, marked with the code LIT-019, is prominent.
The LED display is at the top, with a row of individual transistors below.

Litronix was a manufacturer of LED displays which diversified into the manufacture of electronic hand-held calculators in the early 1970s.

The company was a major supplier in the calculator market and produced a range of well specified and stylish models, with later ones being assembled in Malaysia.  Like Bowmar it was badly hit by the plunging price of calculators in the mid-1970s and left the calculator market.  It was bought by Siemens A.G. of Germany.  Further details about the company in the Calculator Companies section.


  1. Ball, G., and Flamme, B., 1997, "The Complete Collector's Guide to Pocket Calculators", Wilson/Barnett Publishing, Tustin.

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Text & photographs copyright, except where stated otherwise, © Nigel Tout 2000-2024.