Unisonic 799 Handheld Electronic Calculator

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).

References:

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