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:
Mar. 29, 1988
Filed:
May. 16, 1985
Tatsuhiko Kohno, Tokyo, JP;
Kazutoshi Yoshida, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic bubble memory system with a write protecting function is disclosed. In a power on reset mode or initiallizing mode of an information handling system including the bubble memory system, a bubble memory controller directs to and stores in its own memory, an information representative of a write protecting range for a bubble memory device, from a hidden memory region of the bubble memory device. The bubble memory controller compares the write protecting range to the information designating the address range of the bubble memory device in which a new information is to be written, in response to the write command from a host central processing unit. As a result of the comparison, if the both address ranges overlap each other, the bubble memory controller will execute the write protection and generate a write protection error message for the host CPU.