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:
Dec. 16, 1986
Filed:
Jun. 02, 1983
Burton L Oliver, Nanticoke, NY (US);
David C Preston, Newark Valley, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Bus command generation apparatus is provided for a microprocessor implemented data processing system that uses a multibyte width system bus requiring a bus command byte since a complete bus command byte is ordinarily unavailable directly from a microprocessor. A bus command register is loaded with a preliminary bus command, certain bits of which are then modified in accordance with the operation to be performed. The limited command information available from the microprocessor that controls I/O operations is utilized to modify the preliminary bus command bytes without any need to access memory for bus command information. The bus command generation apparatus is adapted to pass a preliminary bus command byte unaltered, under predefined conditions, to the system bus.