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:
Sep. 22, 1992
Filed:
Dec. 31, 1991
Kenneth L Bush, Cypress, TX (US);
Ralph S Perry, Houston, TX (US);
Thomas W Grieff, Houston, TX (US);
George J Scholhamer, Houston, TX (US);
Compaq Computer Corporation, Houston, TX (US);
Abstract
An interface between a CPU bus and peripheral device such as a standard embedded controller disk drive uses either a dedicated, I/O mapped register set for control and status communication between the host CPU and the disk controller, or an alternate 'flex mode' protocol which allows the drive to be used with great versatility in a wide variety of systems. This alternate 'flex mode' protocol does not require changes to the hardware definition of the drive interface, but instead uses the data port to transfer information blocks to set up a subsequent data transfer through this port.