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:
Dec. 02, 1980
Filed:
Sep. 01, 1978
Hitachi, Ltd., , JP;
Abstract
A display system for displaying information in response to an input video signal comprises a data control unit including a microprocessor and a microprogram memory for storing a program for the microprocessor, a refresh memory unit connected to the data control unit through an address bus and a data bus, and a video control unit for accessing display data stored in the refresh memory unit by a timing control unit to produce a video signal. The refresh memory unit comprises memories sectioned by byte, an I/O controller which receives a read/write control signal to indicate whether the access by the data control unit is read access or write access and an access memory specifying signal to indicate whether it is a one-byte memory access or a two-byte memory access to produce an I/O control signal, and a memory controller responsive to the I/O control signal to control data access to the two byte memories.