Abstract: A stand-by control circuit includes a power ON detecting circuit which supplies a flag with a power ON detecting signal to be reset. In a testing mode, the power ON detecting circuit shuts off a current flowing therethrough, so that testing of LSIs each including the stand-by control circuit can be carried out without errors.
Abstract: An electronic printing system with plural hard disks for storing system files with booting process for booting the system to a running condition, the booting process detecting a previously replaced or misplaced disk and in response thereto, enabling booting of the system without loss or re-installing of critical system files.
Type:
Grant
Filed:
April 1, 1991
Date of Patent:
September 6, 1994
Assignee:
Xerox Corporation
Inventors:
Christopher Comparetta, Ronald A. Ippolito, Kitty Sathi, Jack T. Latone, Colleen R. Enzien, Mark A. Smith
Abstract: A circuit for monitoring the program flow of a computerized or microprocessed system, includes a comparator for matching a uniquely assigned address for entering a given mode of operation, with an address presented by the system controller for entering the operating mode. If the addresses do not match, in response to the detected illegal mode entry attempt, a reset signal is generated for resetting the controller to reinitiate the programmed flow of operation.
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