U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Device interface controller for intercepting communication between a microcomputer and peripheral devices to control data transfers

Patent 4821180 Issued on April 11, 1989. Estimated Expiration Date: Icon_subject April 11, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

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Inventors

Assignee

Application

No. 06/705456 filed on 02/25/1985

US Classes:

710/22Direct Memory Accessing (DMA)

Examiners

Primary: Williams, Archie E. Jr.
Assistant: Phung, Anh

Attorney, Agent or Firm

International Classes

G06F 13/26 (20060101)
G06F 13/28 (20060101)
G06F 13/20 (20060101)

Abstract

An apparatus for use with a DMA controller includes a device interface controller having therein both general and specific command programs, and device bus interface. The apparatus is arranged to intercept all communication signals between the DMA controller and a microcomputer associated therewith.

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