Binary coded decimal addressed Read-Only-Memory

Details Binary coded decimal addressed Read-Only-Memory Binary coded decimal addressed Read-Only-Memory

1977-04-01

1980-02-26

Shaw, Gareth D.

Boots, shoes, and leggings

365230, G11C 800, G11C 1700

Patent

active

041908970

ABSTRACT:
A Read-Only-Memory (ROM) is addressed with a binary coded decimal (BCD) address in an address register or program counter. The ROM comprises an array of memory cells with associated row and column lines for addressing the array. Row and column decoders responsive to the address in the address register identify a unique row and column line for each BCD address. The row and column decoders comprise a plurality of decoders in cascaded levels. The decorders in any given level decode particular bits of the address in the address register; these decoders decode a one-out-of-a-prime-number, which prime number is a factor of the number of memory locations in the array.

REFERENCES:
patent: 3921142 (1975-11-01), Bryant et al.

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