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. 19, 1991
Filed:
Nov. 16, 1987
John M Borkenhagen, Rochester, MN (US);
Quentin G Schmierer, Rochester, MN (US);
Charles P Geer, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system for altering physical addresses of semiconductor memory cards to locate an error-free portion to provide a contiguous range of storage which is free from errors. The system contains a memory card ID register which stores the physical addresses of memory cards in positions corresponding to logical addresses. The system evaluates the results of routine tests of memory and rearranges the physical addresses stored in the memory card ID register to provide an error-free portion at the desired logical address range. A separate memory configuration register stores a value representing the size of the memory cards. The value stored in the memory configuration register selects a subset of the logical memory address bits to obtain a logical card address. The logical card address selects a position in the memory card ID register to obtain the physical address of the memory card.