Access verification arrangement for digital data processing system which has demand-paged memory
CA 1237200 A · Owner: Digital Equipment Corporation · Inventors: Sites, Richard L.; Lackey, Stanley A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bus interface unit for connecting a processor to a memory to form a digital data processing system. The storage locations in the memory are grouped in pages each having a selected access rights mode which regulate access to the data stored therein by the programs each, of which has a selected access rights mode. The access rights are assigned on a page by page basis. If an access request from a program requires transfers to multiple locations, the p;rocessor will normally perform an access verification on the first location while it is in the first transfer operation, and then perform the transfer operation and successive transfer operations. If the transfer operations require accesses to …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 24, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 24, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.