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:
Jun. 26, 1979
Filed:
Aug. 04, 1977
Edward F Getson, Jr, Lynn, MA (US);
Frank V Cassarino, Jr, Weston, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
A firmware/hardware method and system is provided for testing interface logic in a data processing system having a plurality of system units intercommunicating over a common electrical bus. Under firmware control, an incorrect parity is generated in a main memory address to be loaded into output registers of a system unit supplying information to the bus. A bus cycle request is issued by the system unit, and when the bus is made available the system unit acknowledges the memory address to initiate a transfer of data from the bus into the input registers of the system unit. Thereafter, the data in the output registers of the device may be compared with the data in the input registers to detect interface logic errors.