United States Patent 4,001,569
General Purpose Calculator having Selective Data Storage, Data Conversion and Time-Keeping Capabilities
Jan. 4, 1977
Inventors:
- Peter D. Dickinson, Monte Sereno, Calif.
- Thomas E. Osborne, San Francisco, Calif.
- France Rode, Los Altos, Calif.
- Allen J. Baum, Los Altos, Calif.
Assignee: Hewlett-Packard Company, Palo Alto, Calif.
Filed: Apr. 8, 1975
Appl. No.: 566,144
Abstract:
A battery powered, hand-held calculator is disclosed which includes a built-in
metric to U.S. conversion function for converting units from one system to the
other; a degrees-minutes-seconds conversion function for converting angles or
units of time from degrees-minutes-seconds to the decimal system and
conversely.
10 Claims, 37 Drawing Figures
An image of first page of this patent is
available (approximately 40 Kbytes).
It is a TIFF class F file at 300 DPI resolution using ITU-T Group 4 Facsimile
(T.6) coding.
Eric's notes:
This patent mainly describes the HP-45, although it contains detailed
technical information concerning the circuitry and instruction set which is
used in the entire Classic series. It contains the entire microcode ROM
listing of the HP-45.
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Last updated July 17, 1995
Copyright 1995 Eric Smith
eric@brouhaha.com
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