Computer system having programmable dma control
CA 1290068 C · Owner: Heath, Chester Asbury · Inventors: Heath, Chester Asbury; Lenta, Jorge Eduardo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
IBM Docket No. BC9-86-010, COMPUTER SYSTEM HAVING PROGRAMMABLE DMA CONTROL ABSTRACT OF THE DISCLOSURE, A computer system in which peripherals greater in number than the number of DMA channels provided in the system can all have DMA access. Some of the DMA channels are dedicated to certain ones of the peripherals, while others, termed "programmable" DMA channels are shared by remaining ones of the peripherals. Each peripheral having DMA access has a channel priority value. When a peripheral wants DMA access it trans-, mits its channel priority value onto an arbitration bus. The winning channel priority value is then compared with prestored DMA channel assignment values. If the comparison is …
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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 October 1, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 2008.
- 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
Timeline From CIPO dates
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.