Unisonic XL-101 Electronic Calculator

This lightweight, non-printing electronic calculator has an array of nine digit keys at the center with a zero bar and a decimal point key below these. On the right are arithmetic and clear keys. On the left are percentage, percent change, gross profit margin, item count, clear memory, recall memory, memory subtraction, and memory addition keys. A switch between a floating and a fixed decimal point, a constant switch, and a power switch are above the keyboard. Behind is a ten-digit vacuum fluorescent diode display. A cabinet has space for two D batteries. A hole for a cord is at the back, but there is no cord.
A mark on the front of the machine reads: Unisonic XL-101. A label on the back reads in part: Unisonic XL-101 (/) 10-DIGIT DESK-TOP (/) ELECTRONIC CALCULATOR. It also reads in part: SERIAL NO. 055588 (/)MADE IN TAIWAN. The bottom of the keyboard is stamped: 53 3 24. The interior of the calculator has a single circuit board with a mark on the bottom that reads: 5212232. A mark on the top of the base of the keyboard reads: CA-24 A-1. The chip by Texas Instruments has a mark that reads: TMC1073NL (/) KSLP 814. The “7814” indicates that the chip was made in the 14th week of 1978.
The device has a black plastic cover marked: Unisonic.
Compare the Radio Shack EC-2001 (1986.0998.007) and Lloyd’s Accumatic 680 (1986.0988.006). Radio Shack advertised the EC-2001 in American newspapers as early as 1978 and as late as 1985. Ads for the Unisonic XL-101 appeared in 1979 and 1980. Prices for the Unisonic XL-101 ranged from $19.70 to $29.95
[advertisement], Boston Globe,February 25, 1979, p. 23.
[advertisement], Washington Post, March 13, 1980, p. A16.
Currently not on view
Object Name
electronic calculator
date made
ca 1978
Unisonic Products Corporation
Physical Description
plastic (case, keys, cover material)
glass (display material)
metal (circuitry material)
overall: 6 in x 6 5/16 in x 2 in; 15.24 cm x 16.002 cm x 5.08 cm
place made
ID Number
catalog number
accession number
Computers & Business Machines
Desktop Electronic Calculators
See more items in
Medicine and Science: Computers
Desktop Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of John B. Priser
Additional Media

Visitor Comments

3/30/2016 6:09:01 PM
Moses Gonzalez
I work at San Bernardino Valley College, I was just looking this up to find out the year it was made. I came across one of these today and was just curious.
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