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. 11, 1986
Filed:
Jul. 07, 1982
Shunsuke Furukawa, Tokyo, JP;
Yoshitsugu Hattori, Ichikawa, JP;
Yoshihiko Matsumoto, Isezaki, JP;
Hiroshi Okubo, Atsugi, JP;
Sony Corporation, Tokyo, JP;
Abstract
In a microcomputer system with an asynchronous working central processing unit (CPU) and a cathode ray tube (CRT) display, a memory access control apparatus includes a memory, particularly a video RAM, a CRT controller connected to the CRT for accessing the memory, a system clock for generating system clock pulses which are supplied to the CPU, a multiplexing clock for generating multiplexing clock signals based on the system clock and having a frequency which is one-half the frequency of the system clock pulses, and a multiplexer connected to the CPU and the CRT controller through which the CPU and the CRT controller selectively access the memory in a time sharing manner according to the multiplexing clock signals.