System for switching multiple virtual spaces

Details System for switching multiple virtual spaces System for switching multiple virtual spaces

1974-03-18

1977-01-18

Shaw, Gareth D.

Communications: electrical

Digital comparator systems

G06F 920

Patent

active

040042782

ABSTRACT:
In a virtual memory system capable of embodying therein multiple virtual spaces used in a switching mode and having a high speed memory for storing address sets each including a virtual address of the virtual space and a real address of a real space corresponding to the virtual address and indicators for setting the validity or invalidity state of the corresponding address sets, a switching system such that when the multiple virtual spaces are switched, the virtual address in the addressed address set is compared with a special address stored in a register by a comparator, and the indicator corresponding to the addressed address set is set to the invalidity state when the result of comparison fulfills a predetermined condition.

REFERENCES:
patent: 3585606 (1971-06-01), Evans et al.
patent: 3764996 (1973-10-01), Ross
patent: 3800291 (1974-03-01), Cocke et al.

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