Array design using a four state cell for double density

Static information storage and retrieval – Read only systems – Semiconductive

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365 45, G11C 1136, G11C 1706

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044620888

ABSTRACT:
A bipolar ROM (read only memory) or ROS (read only storage) system in which the array devices embody four different, two-terminal, device forms: low barrier Schottky diodes; standard or high barrier, Schottky diodes; junction diodes; and no diodes; thereby to make possible four levels of storage for each cell. This effectively doubles the information content for an array with litle increase in the array size.

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patent: 3818724 (1974-06-01), Bourgeois
patent: 4174521 (1979-11-01), Neale
patent: 4202044 (1980-05-01), Beilstein, Jr. et al.
1980 IEEE International Solid-State Circuits Conference, Feb. 14, 1980, p. 108, A Numeric Data Processor, R. Nave et al.
1981 IEEE International Solid-State Circuits Conference, Digest of Technical Papers, Feb. 19, 1981, pp. 116-117, The Interface Processor for the 32b Computer, J. Bayliss et al.

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