Robert G Markle Deceased208 Grand Ave, South Pasadena, CA 91030

4045779, Aug 30, 1977

Mar 15, 1976

5/666825

Robert Eugene Markle - Rancho Palos Verdes CA

Xerox Corporation - Stamford CT

G06F 1110
G11C 2900

364900

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.

4523299, Jun 11, 1985

Sep 21, 1982

6/421019

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

Xerox Corporation - Stamford CT

G06F 900
G03G 1500

364900

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.