Unisonic 799 Handheld Electronic Calculator

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This handheld electronic scientific calculator has a metal and plastic case and an array of twenty-six rectangular plastic keys. The ten digit keys and decimal point key are white. They can take on a different meaning if the orange F key is pushed. The calculator can perform basic arithmetic; compute trigonometric and inverse trigonometric functions; and compute powers, exponents, natural logarithms, common logarithms, inverses, and square roots. It also has memory keys and a key for pi. To the right of the F key are radian/degree and on/off switches. A mark above this reads: Unisonic 799.
Behind the keyboard is an eight-digit green vacuum fluorescent display. This display also could show a five-digit mantissa and two-digit exponent (with signs for both).
A power jack is on the top edge.
The back of the calculator has a sticker describing advanced problem solving. It reads in part: 799-A. It also reads in part: SERIAL NO. (/) 030944 (/) MADE IN JAPAN. Below this is a compartment for four AA batteries.
Compare 1986.0988.116 (Unisonic 796).
John F. Free, “Now There’s a Personal Calculator for Every Purpose,” Popular Science, 206 #2, February, 1975, pp. 78–81, 136–137. The Unisonic 799 is listed as selling for $99.
[Advertisement], Hartford Courant, June 13, 1976, p. 15M. Unisonic 799 on sale for $26.88.
Currently not on view
date made
ca 1975
place made
Physical Description
plastic (case; keys; circuit board material)
metal (case; circuitry material)
glass (display material)
paper (sticker material)
overall: 1 1/4 in x 3 1/2 in x 6 in; 3.175 cm x 8.89 cm x 15.24 cm
ID Number
accession number
catalog 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


What is the DR key function on the unisonic 799 calculator?

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