HP9100 Prototype Desktop Electronic Calculator

Description
This transistorized electronic calculator is the prototype for the first electronic calculator sold by Hewlett-Packard Company, the HP 9100. The machine was notable for its ability to compute transcendental functions at the push of a button, and for the range of values that could be computed.
The prototype has a metal case painted gray. At the right center is an array of nine digit keys and a 0 bar, with clear display, enter exponent, and change sign keys above these. To the right of these keys is an array of 14 programming keys. Left of the digit keys are keys for arithmetic operations, square roots, and repetition. The 15 further keys to the left are for a variety of trigonometric, hyperbolic, and exponential functions.
Above these keys are four switches. The leftmost determines whether angles entered and computed are in radians or degrees. The second switch from the right determines whether the decimal point is floating or fixed. The third switch turns the power on or off. The leftmost switch sets the mode as run or program. A display and a dial that may be set between 0 and 9 are behind the keyboard and switches. At the back are a power cord and a connector.
The prototype brought together ideas of Thomas Osborne, Malcolm McMillan, and others at Hewlett-Packard. For Osborne’s earlier prototype, see 19780311.01 and 1978.0311.02. For a production model of the HP9100B, see 2012.0044.01.
Bernard M. Oliver, “How the Model 9100A Was Developed,” Hewlett-Packard Journal, September, 1968. A copy of this article is at the HP Museum website.
Location
Currently not on view
Object Name
electronic calculator
electronic calculator prototype
date made
ca 1966
date received
1978
maker
Hewlett-Packard Company
Osborne, Thomas E.
Physical Description
metal (case, wiring material)
plastic (keys, wiring material)
glass (display material)
rubber (cord material)
Measurements
overall: 22.5 cm x 39.8 cm x 48.7 cm; 8 27/32 in x 15 21/32 in x 19 3/16 in
place made
United States: California, Palo Alto
ID Number
1978.0311.03
accession number
1978.0311
catalog number
1978.0311.03
subject
Business
Computers & Business Machines
Desktop Electronic Calculators
Trigonometry
See more items in
Medicine and Science: Computers
Trigonometry
Desktop Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Hewlett-Packard Company
Additional Media

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