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:
Sep. 08, 1992
Filed:
Oct. 17, 1989
Michio Maruyama, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A memory device for a page printer utilizing a one port random access memory in connection with a central processing unit to process print data is provided. A first memory circuit is provided to receive head address data from the CPU. A second memory circuit receives tail address data from the CPU. The first memory circuit and second circuit store these input values. A first comparator compares the head address data stored in the first memory circuit with address data produced by the CPU, while a second comparator compares the tail address data stored in the second memory circuit with address data produced by the CPU. The memory is divided into a first region defined by the head address and the tail address and an other region. A memory control circuit receives the outputs from the second comparator and the first comparator and accesses one of the first region or the other region in response to the outputs of the comparators.