Microprogram controlled data processing system

Details Microprogram controlled data processing system Microprogram controlled data processing system

1978-01-12

1980-04-08

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 916

Patent

active

041975782

ABSTRACT:
A circuit outputs different subsidiary address data depending on operand address data contained within operand designation fields and operation codes of system instructions. A control storage, which stores microinstructions, is accessed for the initial microinstructions, contained within microinstruction sequences for system instructions, at storage locations specified by the operation codes and the subsidiary address data. As a result, different microinstruction sequences for system instructions with the same operation code can be initiated depending on the operand address data, without using any microinstructions for testing the operand address data.

REFERENCES:
patent: 3404378 (1968-10-01), Threadgold et al.
patent: 3800293 (1974-03-01), Enger et al.
patent: 3990054 (1976-11-01), Perlowski
patent: 4080648 (1978-03-01), Asano et al.
patent: 4087857 (1978-05-01), Joyce et al.

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