Microprogram memory bank addressing system

Details Microprogram memory bank addressing system Microprogram memory bank addressing system

1977-04-01

1978-10-03

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 912, G06F 1300

Patent

active

041187733

ABSTRACT:
An apparatus for increasing the capacity and speed of access of a large microprogram read only memory. The apparatus incorporates the use of a four bit control field in a microinstruction word which is set into a hardware register to extend the address beyond the normal range of the addressing capability of the microinstruction word. The four bits stored in the hardward register allow one of a maximum of sixteen read only memory banks to be selected. The word in the selected bank is selected by the normal range. This technique also allows the selection of another of the read only memory banks in one machine cycle.

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patent: 3932844 (1976-01-01), Yokoo
patent: 4028678 (1977-06-01), Moran
patent: 4040029 (1977-08-01), Young

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