United States Patent 3,855,461
Calculator with key code association and display features
| Issued: | Dec. 17, 1974
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| Inventor: | Richard Kent Stockwell, Palo Alto, Calif.
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| Assignee: | Hewlett-Packard Company, Palo Alto, Calif.
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| Appl. No.: | 393,081
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| Filed: | Aug. 30, 1973
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Abstract:
A programmable calculator is provided with an indexing scheme for
directly associating displayed key codes with the physical position of
non-numeric or the identity of digit keys contained on the keyboard.
Individual keys are represented by a two-digit number wherein the most
significant digit is the number of the row in which the key is located
and the least significant digit is the number of the column which the
key occupies along that row. For digit keys the first digit of the key
code is zero and the second digit of the key code is the assigned value
of the key. The calculator also includes provision for displaying the
key code of the last key actuated.
12 Claims, 2 Drawing Figures
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