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. 20, 1977
Filed:
Jul. 18, 1975
Hitachi, Ltd., , JA;
Abstract
A dual computer system comprising a pair of computer systems and a dual system controller for monitoring the results of the operations by the computer systems. When the results of the operations coincide with each other, such results are applied to an external output register for process control, while when there is non-coincidence between the results of the operations the operation of the computer systems is interrupted and both the computer systems are checked with a diagnose routine for detection as to whether the operation is normal or abnormal. In the system, a status register is provided so that the computer systems can read the content of the register before being placed in independent operation. The main and subsidiary computer systems read the content of the register with different timing so that they may not arbitrarily deliver their outputs to the external output register due to malfunctions of the dual system controller.