Robert J Markle

US Patent:

40457796, Aug 30, 1977

Filed:

Mar 15, 1976

Appl. No.:

5/666825

Inventors:

Robert Eugene Markle - Rancho Palos Verdes CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06F 1110
G11C 2900

US Classification:

364900

Abstract:

A circuit for storing data in a random access memory containing one defective bit per word. A separate read-only memory device or programmable logic array is provided to produce an interrupt bit whenever a memory location containing a defective bit is addressed, where a defective bit is defined as one that is stuck at 1 or stuck at 0. If an interrupt bit is generated the data word is read out from memory and compared to the original. If an equality exists, nothing further is required. If there is an inequality the data word is complemented and stored, and a flag bit is set. When data is read from memory, if the flag bit is set, the data word is complemented again before being used.

US Patent:

45232997, Jun 11, 1985

Filed:

Sep 21, 1982

Appl. No.:

6/421019

Inventors:

James M. Donohue - Los Alamitos CA
Robert E. Markle - Rancho Palos Verdes CA
George E. Mager - Hermosa Beach CA
Stephen P. Wilczek - Fairport NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06F 900
G03G 1500

US Classification:

364900

Abstract:

A copy reproduction machine is subdivided into discrete operating modules and coupled together by a shared communication line over which operating messages from and to the modules are transmitted. Each module includes a receiver for intercepting and capturing messages bearing the module's address and a transmitter for transmitting messages from the module and addressed to other modules over the shared communication line.