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Radio Shack EC-225 Handheld Electronic Calculator (Earlier Version)

Radio Shack EC-225 Handheld Electronic Calculator (Earlier Version)

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This handheld electronic calculator has a tan and brown plastic case and an array of fifteen keys, most of them square. These include ten digit keys, a decimal point key, four arithmetic function keys, a total key, a constant key and a cancel key. The on/off switch is behind the keys at the left. Text next to it reads: Radio Shack. Behind this is an eight-digit red LED display.
At the top is a space for four AA batteries. A jack for a power adapter is on the back edge.
The back of the calculator has four molded feet, as well as extensive operating instructions that are also molded into the plastic. The text reads in part: FOR DC OPERATION: USE 4 TYPE AA BATTERIES (/) FOR AC OPERATION USE ONLY CAT. NO. 13-854 (/) Made in Canada for (/) RADIO SHACK, A TANDY CORPORATIONCOMPANY (/) FORT WORTH, TEXAS, 76107 (/) RADIO SHACK MODEL EC-225. A tag toward the bottom reads: BASE PLATE NUMBER (/) 999035693.
Radio Shack sold at least two calculators under the model EC-225 number. This is the first of them, made by the Canadian firm of General Instrument. Compare to the General EZ-2000 calculator. A second Radio Shack calculator with model number EC-225 is shown in the 1979 Radio Shack catalog and was introduced as new in a December 1979 Washington Post advertisement.
Compare Victor 95 (1986.0988.247).
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 72, 119.
Radio Shack, A Tandy Company, 1979 Catalog No. 302, p. 129, accessed September 22, 2014, at The price listed for the calculator—not this EC-225—is $17.95.
[Advertisement], Washington Post, December 16, 1976, p. VA_12. This is also the second form of the EC-225.
Currently not on view
Object Name
electronic calculator
date made
ca 1973
Tandy Corporation
place made
Physical Description
plastic (case; display cover; keys material)
metal (circuitry material)
overall: 1 in x 3 in x 6 in; 2.54 cm x 7.62 cm x 15.24 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History
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