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:
Aug. 26, 1986
Filed:
Sep. 30, 1983
John J Bradley, Framingham, MA (US);
Theodore R Staplin, Jr, Chelmsford, MA (US);
Ming T Miu, Chelmsford, MA (US);
Thomas C O'Brien, Ashland, MA (US);
George M O'Har, Chelmsford, MA (US);
Melinda A Widen, Arlington, MA (US);
Brian L Stoffers, No. Billerica, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
What is disclosed is apparatus making up an arithmetic logic unit and utilizing a programmable read-only memory (PROM) to perform arithmetic functions for an associated processor. The PROM is used as a look-up table for computation results. Operands used to perform a mathematical computation make up an address to the PROM which is used to read out the computation result stored therein. Also stored in the PROM as part of each computation result are information bits indicating if the computation result is a valid answer. These bits are also read out and stored in flip-flops to indicate to the processor if the computation result is valid or invalid.