Sony Model MD-6 Prototype Electronic Calculator

Sony Model MD-6 Prototype Electronic Calculator

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This is a prototype for a non-printing desktop electronic calculator made by Sony Corporation of Japan. It has an array of nine digit keys, with a zero bar and a decimal point key below these. The keyboard also includes keys for the four arithmetic operations and an equals key. The machine also has an on/off switch, a clear key, and an “attention” light on the left and five further keys on the right. Behind is a display for the answer. The machine shows result up to ten digits long in ten tubes.
A mark on the front left of the machine reads: SONY. A mark on the back reads: SONY ELECTRONIC CALCULATOR (/) MODEL MD-6 NO. 7K282214.
A slightly earlier Sony prototype calculator was exhibited at the World Electronics Show in New York in the latter part of March 1964, and the Japanese Pavilion at the New York World Exposition opening in April. Early engineering drawings for the MD-6 are dated July 18, 1964.
Accession File
Documentation received as part of accession 313986.
Currently not on view
Object Name
electronic calculator
date made
Sony Corporation of America
place made
Japan: Tōkyō, Tokyo
Physical Description
rubber (feet material)
glass (cover for display material)
plastic (keys material)
metal (case material)
overall: 7 in x 13 1/2 in x 17 1/2 in; 17.78 cm x 34.29 cm x 44.45 cm
ID Number
accession number
catalog number
Credit Line
Gift of Sony Corporation
See more items in
Medicine and Science: Computers
Desktop Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History
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