United States Patent 4,037,092
Calculator having Preprogrammed User-Definable Functions
July 19, 1977
Inventors:
- Thomas E. Osborne, San Francisco, Calif.
- Richard Kent Stockwell, Palo Alto, Calif.
Assignee: Hewlett-Packard Company, Palo Alto, Calif.
Appl. No.: 419,153
Filed: Nov. 26, 1973
Abstract:
A calculator has one or more keys which initiate the performance of
user-defined subroutines. When the calculator is turned on, the calculator
memory is programmed with a predetermined subroutine which may subsequently
be changed or replaced by the user.
6 Claims, 2 Drawing Figures
An image of first page of this patent is
available (approximately 31 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 describes the HP-65, although the keyboard diagram doesn't quite
match the real thing.
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Last updated July 17, 1995
Copyright 1995 Eric Smith
eric@brouhaha.com
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