Miniaturized key entry and translation circuitry arrangement for

Details Miniaturized key entry and translation circuitry arrangement for Miniaturized key entry and translation circuitry arrangement for

1974-09-27

1977-04-26

Chapnick, Melvin B.

Communications: electrical

Digital comparator systems

340365S, G06F 302

Patent

active

040204677

ABSTRACT:
A key entry and translation system useful with data processing units such as electronic calculators for the purpose of entering desired input information from a keyboard in a predetermined code notation into the data processing units. The present system is of a type wherein the input information from the keyboard is sensed and manipulated in an arithmetic circuit contained within a central processor unit (CPU) in response to program instructions stored in a read-only memory (ROM) and then is entered into the data processing unit through an input buffer contained within a random access memory (RAM). Pursuant to the present system, key entries may be registered during arithmetic operations or printing procedures, through the use of a CPU. Furthermore, the present system is adapted to determine whether the input information from the keyboard is either present or absent before interrogation as to the contents of the input information, for the purpose of speeding up arithmetic operations. Utilization of an address selection circuit contained within a RAM for generating key strobe or time-shared interrogate signals provides a considerable reduction in a large scale integrated circuit (LSI) which incorporates the above discussed components on a single semiconductor chip.

REFERENCES:
patent: 3427593 (1969-02-01), Wells et al.
patent: 3769621 (1973-10-01), Osborne
patent: 3781874 (1973-12-01), Jennings
patent: 3892957 (1975-07-01), Bryant

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