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. 25, 1990
Filed:
May. 22, 1987
Megumu Kondo, Kawasaki, JP;
Shuji Kamiya, Kawasaki, JP;
Kazuhiko Fukuoka, Machida, JP;
Masatsugu Shinozaki, Hadano, JP;
Hitoshi Sadamitsu, Kanagawa, JP;
Hitachi Ltd., Tokyo, JP;
Hitachi Microcomputer Engineering, Tokyo, JP;
Abstract
In a data processing system having a central processing unit, at least an input/output unit such as an MT unit or a floppy disk unit, a memory, an address bus, a first address translation unit, a second address translation unit, and an address selection unit, an output address from the central processing unit is translated by the first address translation unit to supply a resultant address to the address bus and, an output address from the input/output unit is directly fed to the address bus. An address on the address bus is delivered to the address selection unit, and the address selection unit selectively supplies the memory with the output address delivered from the first translation unit onto the address bus or with the resultant address obtained by translating the output address from the input/output unit by means of the second translation unit. In this configuration, the second address translation unit, to translate an address from the input/output unit, is disposed at an input to the memory, which eliminates the necessity for a translator on the side of the input/output device.