STO Stack control system

Details STO Stack control system STO Stack control system

1982-09-27

1984-12-25

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 900

Patent

active

044907877

ABSTRACT:
A segment table origin (STO) stack control system employed in a data processing system which enables dynamic access over a plurality of virtual spaces, and in which the STO stack is retrieved depending upon the contents of a plurality of control registers which specify virtual spaces. In this system, when the contents of a given control register are changed to register a new STO data based on an STO identifier (STO.multidot.ID) in the STO stack and when it becomes necessary to erase the STO data of an old STO.multidot.ID due to the limited number of storage locations on the STO stack, the STO data corresponding to the old STO.multidot.ID is not erased when the registration thereof is effected on the basis of the virtual space that corresponds to the contents of other control register but, instead, the STO data corresponding to the old STO.multidot.ID registered on the basis of the space corresponding to the control register whose contents are changed, is erased.

REFERENCES:
patent: 3781808 (1973-12-01), Ahearn et al.
patent: 4068303 (1978-01-01), Morita
patent: 4326248 (1982-04-01), Hinai et al.
patent: 4430705 (1984-02-01), Cannavino et al.

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