Xerox Corporation

Michael T Dugan

Ronald A Ippolito

Tuan A Nguyen

George E Baker

Dennis E Miazga

The present invention is the designation of one of the processors in the system as the master processor with the roll of resetting the other processors after a software crash. When a system software crash occurs, the master processor provides a reset signal that is automatically conveyed to each of the other processors to synchronize the return of the other processors back to the normal state of operation.

Single point microprocessor reset

A Communication Manager for controlling communication between intelligent processors. The Communication Manager is a software on silicon building block providing a set of primitive instructions to extend the instruction set of the underlying microprocessor and to provide a real time multitask capability. The Communication Manager handles a command control block (CCB) and shared line receiver and shared line transmitter state registers to receive and send data on a shared communication line.

Communication manager

A reproduction machine incorporating self test routines to test the machine operating logic, particularly at start up, to insure the integrity and operability of the component parts of the operating logic. The tests include routines for initially checking the machine master control module logic and memory. A display panel on the master control module visually identifies any fault in the event the communication link to the machine main display has failed. Once the operability of the master control module is established, self tests of the various machine remote control modules are carried out followed by a test of the communication channel between all modules. Any fault found is visually identified to facilitate repair and servicing.

Growing community of inventors

Fairport, NY, United States of America

Michael T Dugan