Selectable eight or twelve digit integrated circuit calculator a

Details Selectable eight or twelve digit integrated circuit calculator a Selectable eight or twelve digit integrated circuit calculator a

1975-11-19

1977-08-09

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307208, 307242, 307268, 307269, 340173R, H03K 1756, H03K 513, H03K 1908, G11C 1121

Patent

active

040413306

ABSTRACT:
An integrated circuit calculator which can operate in either a twelve digit or an eight digit mode is provided. A conditional modification circuit modifies some of the memory addresses employed in the twelve digit calculator to provide the eight digit calculator with more random access memory registers than the 12 digit calculator. In the twelve digit calculator, the conditional modification circuit also controls folding of some memory registers in order to minimize the chip area required for the memory circuitry and control logic.

REFERENCES:
patent: 3601634 (1971-08-01), Ebertin
patent: 3641366 (1972-02-01), Fujimoto
patent: 3778784 (1973-12-01), Karp et al.
patent: 3786437 (1974-01-01), Croxon et al.
patent: 3796893 (1974-03-01), Hoffman et al.
patent: 3806880 (1974-04-01), Spence

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