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:
Nov. 16, 1993
Filed:
Apr. 15, 1993
Yukichi Sawaki, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Aichi, JP;
Abstract
A digital electronic circuit device includes a CPU provided with multiplexed address/data terminals and exclusive address terminals, an expansion port provided with data terminals and exclusive address terminals, a multiplexed address/data bus connecting the multiplexed address/data terminals with the data terminals and an address bus connecting the address terminals of the CPU with the address terminals of the expansion port. If a program for the CPU is likely to contain many bugs, a detachable external ROM for storing the program and an address latch are connected with the multiplexed address/data bus. The address latch receives address signals from the multiplexed address/data bus, temporarily stores these signals and addresses the external ROM.