Unicom 202/SR Handheld Electronic Calculator
date: label: date made
content: 1973-1975
name: label: maker
content: Rockwell International
notes: label: Description
content: The calculator manufacturer Unicom was started by integrated circuit manufacturer American Microsystems, Inc., and purchased by Rockwell International in 1972. Rockwell would soon begin to sell calculators under its own name.
label: Description
content: This handheld electronic calculator is designed for scientific as well as arithmetic calculations. It has a tan plastic case and an array of twenty sloping square plastic keys. Symbols on the keys are for ten digits, a decimal point, four arithmetic functions, total, change sign, transfer, and clear. A twentieth key is marked F. Pushing it changes the meaning of the other keys to a function denoted above the key. The keys will then allow one to evaluate logarithms, exponents, powers, trigonometric functions, inverses, pi, and inverse trigonometric functions. Five keys serve various memory functions.
label: Description
content: The on/off switch is above the keyboard on the left. A switch on the right above the keyboard allows for entries of angles in degrees or radians.
label: Description
content: Behind the keyboard is an eight-digit vacuum fluorescent display. A jack for a battery charger is along the back edge.
label: Description
content: A compartment at the bottom of the back of the calculator holds four AA batteries. A sticker above it reads: 202 SLIDE RULE (/) Rechargeable NI-Cad Batteries. Use Unicom NI-Cad bat- (/) tery charger to recharge. Allow 7 hours for full charge. (/) Do NOT use battery charger with NI-CAD batteries re- (/) moved. Disposable Batteries: Use 4 AA alkaline batteries. Do NOT use battery charger with disposable batteries. (/) Unicom Systems (/) Rockwell International 192609-50 (/) UNICOM SYSTEMS, SUNNYDALE, CALIFORNIA 94086 (/) ASSEMBLED IN MEXICO.
label: Description
content: The calculator has a brown carrying case that has been cut so that it might be worn on a belt.
label: Description
content: References:
label: Description
content: [Advertisement], <I>Los Angeles Times</I>, November 13, 1973, p. C6. Scientific calculator for under $200 – cost $195.00.
label: Description
content: [Advertisement], <I>Chicago Tribune</I>, September 10, 1974, p. A9. Calculator advertised as on sale for $119.88.
label: Description
content: [Advertisement], <I>Chicago Tribune</I>, March 11, 1975, p. 6. Calculator advertised as having regular price of $109.95, sale price of $79.88.
label: Description
content: Guy Ball and Bruce Flamm, <I>The Complete Collector’s Guide to Pocket Calculators</I>, Tustin, CA: Wilson/Barnett, 1997, pp. 165–166.
label: Location
content: Currently not on view
place: label: place made
content: Mexico
setName: label: See more items in
content: Medicine and Science: Computers
label: See more items in
content: Computers & Business Machines
label: See more items in
content: Handheld Electronic Calculators
creditLine: label: Credit Line
content: Gift of John B. Priser
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.0988.076
label: catalog number
content: 1986.0988.076
label: accession number
content: 1986.0988
objectType: label: Object Name
content: electronic calculator
label: Other Terms
content: electronic calculator; Handheld
physicalDescription: label: Physical Description
content: plastic (case; keys; display cover; carrying pouch material)
label: Physical Description
content: metal (circuitry material)
label: Physical Description
content: paper (sticker material)
label: Measurements
content: overall: 1 1/2 in x 3 1/4 in x 6 1/8 in; 3.81 cm x 8.255 cm x 15.5575 cm