Equate operand address space control system

Details Equate operand address space control system Equate operand address space control system

1976-04-30

1977-09-20

Nusbaum, Mark E.

Boots, shoes, and leggings

G06F 920

Patent

active

040500608

ABSTRACT:
The disclosure describes equate operand spaces (EOS) control over the addressabilities accessed by means of different address keys in an address key register (AKR) in a processor. Executing instructions, and their source and sink type operands may have different address keys in the AKR, and therefore different addressabilities. When enabled, the EOS control forces each source operand fetch to occur within the sink operand addressability specified in the AKR, even though the AKR explicitly contains a different addressability for source operands. When the EOS feature is disabled, the source operand addressability contained in the AKR is used when fetching source operands. An EOS field in the AKR stores whether the EOS state is enabled or disabled in the processor.

REFERENCES:
patent: 3581291 (1971-05-01), Iwamoto et al.
patent: 3651483 (1972-03-01), Clark et al.
patent: 3716840 (1973-02-01), Masten et al.
patent: 3771136 (1973-11-01), Heneghan et al.

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