System condition selection circuitry

Details System condition selection circuitry System condition selection circuitry

1980-01-24

1983-11-08

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 900, G06F 922

Patent

active

044146256

ABSTRACT:
An apparatus in a microprogrammed digital data processing system is disclosed for reducing the time to select, from a plurality of available system condition signals in the system, one system condition signal to be tested during the performance of a microinstruction. The operation code portion of a new macroinstruction word is used to address a memory to output an associated one of a plurality of stored preselected signal patterns. In response to the outputted signal pattern, a first selection circuit preselects a set of system condition signals from the plurality of available system condition signals. A second selection circuit is responsive to a control signal provided by each microinstruction of the instruction for selecting a particular one of the set of system condition signals to be tested.

REFERENCES:
patent: 3794979 (1974-02-01), McMahon
patent: 4001788 (1977-01-01), Patterron et al.
patent: 4038643 (1977-07-01), Kim

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