The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1995
Filed:
Aug. 12, 1991
Applicant:
Inventor:
Joseph M Lamb, Hopedale, MA (US);
Assignee:
Stratus Computer, Inc., Marlboro, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
395275 ; 395725 ; 3642423 ; 36424231 ; 36424234 ; 364D / ;
Abstract
An I/O controller for transferring data between a host processor and one or more I/O units. The controller interleaves processor command transfers (PIO) in the midst of direct memory access (DMA) transfers without repeated data moves. DMA transfers are suspended temporarily during the priority PIO transfer. An interrupt Scanner, for scanning the various I/O units, is also prioritized with respect to DMA and PIO transfers.