Calculator having merged key codes

Details Calculator having merged key codes Calculator having merged key codes

1973-12-17

1978-07-04

Morrison, Malcolm A.

Boots, shoes, and leggings

340365R, G06F 1300

Patent

active

040992462

ABSTRACT:
A hand-held, programmable, electronic calculator is capable of performing a larger number of functions than the number of keys on its keyboard and has one or more prefix keys to allow one function key to initiate more than one function. Each key generates a unique key code when it is depressed, and the calculator may be programmed by storing a series of the key codes in a memory. Memory space can be saved by generating unique merged codes to represent the combination of a prefix key and a function key, and storing this single merged code rather than the two key codes.

REFERENCES:
patent: 3533076 (1970-10-01), Perkins et al.
patent: 3588841 (1971-06-01), Ragen
patent: 3760171 (1973-09-01), Wang et al.
patent: 3762637 (1973-10-01), Hernandez
patent: 3855461 (1974-12-01), Stockwell
patent: 3863060 (1975-01-01), Rode et al.

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