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:
Jan. 11, 1977
Filed:
Dec. 22, 1975
David B O'Keefe, Tyngsboro, MA (US);
Frank V Cassarino, Jr, Weston, MA (US);
Douglas L Riikonen, Westford, MA (US);
Honeywell Information Systems, Inc., Waltham, MA (US);
Abstract
A device controller having a microprogrammed control store for storing instructions useable in the control of the controller and a scratch pad memory for storing device specific information useable in the control and operation of the device is provided. An addressed instruction is received by an instruction register from which control signals are generated. The contents of the instruction register are used to address the control store as well as the scratch pad memory and in addition is received by means of a multiplexor by an arithmetic unit which provides computations in the controller. The multiplexor which in addition receives signals from the scratch pad memory and the devices is also directly coupled to write information in the scratch pad memory. The controller may receive diagnostic and other instructions from a coupled data processor which are then used to control the operation of the controller in place of the instructions in the control store.