Digital processor system with direct access memory

Details Digital processor system with direct access memory Digital processor system with direct access memory

1976-08-11

1979-05-29

Shaw, Gareth D.

Boots, shoes, and leggings

364736, G06F 1300

Patent

active

041569270

ABSTRACT:
A digital processor which may be used in a calculator is provided by an MOS/LSI semiconductive chip which contains a bit-parallel arithmetic unit for operating on data stored in a random access memory. Selector units determine which of several sources produce the inputs to the arithmetic unit. The random access memory has X and Y, or page and word addressing. Part of the random access memory provides direct access for readout. Numerical data at the Y address in the direct access memory is always available at the selector units for input to the arithmetic unit, at the same time that data at the same Y address but another X address is read out to be also an input to the arithmetic unit. The direct access part of the memory is addressed for write in by the same addressing means as the remainder of the memory. This arrangement reduces the number of machine cycles needed for arithmetic operations, and so provides faster calculations.

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patent: 3967104 (1976-06-01), Brantingham et al.
patent: 3978457 (1976-08-01), Check, Jr. et al.
patent: 4009379 (1977-02-01), Musch

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