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. 05, 1978
Filed:
Oct. 11, 1977
Jerry H Pertl, Bloomington, MN (US);
Howard A Koehler, Minneapolis, MN (US);
Sperry Rand Corporation, New York, NY (US);
Abstract
This invention relates to an apparatus and method for preventing a digital computer from erroneously outputting data contained in an output word to another digital computer or peripheral device. A portion of the output word is allocated as a key field which must be matched with a predetermined lock value before the digital computer will allow an output of the data field of the output word to occur. That is, a key value specified as part of the output word must match a predetermined lock value before an output transfer of the data field of the output word is allowed to take place. If the lock value and key value do not match, the central processor section of the digital computer is interrupted. This apparatus and method not only verifies the correct operation of the digital computer output data transfer hardware by preventing an erroneous transfer of the data field of the output word but also alerts the central processor section in the event of a mismatch by means of an interrupt.