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:
Oct. 03, 1978
Filed:
Apr. 01, 1977
Michel M Raguin, Medford, MA (US);
Thomas F Joyce, Burlington, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
An apparatus for increasing the capacity and speed of access of a large microprogram read only memory. The apparatus incorporates the use of a four bit control field in a microinstruction word which is set into a hardware register to extend the address beyond the normal range of the addressing capability of the microinstruction word. The four bits stored in the hardward register allow one of a maximum of sixteen read only memory banks to be selected. The word in the selected bank is selected by the normal range. This technique also allows the selection of another of the read only memory banks in one machine cycle.