Xerox Corporation

Thomas G Beaman

Michael D Dixon

Robert M VanDuyn

James J Des Rivieres

Raymond I Mason

Robert P Ferraro

Khalid M Rabb

Joseph W Ward

Jeff C Carter

Donald L Wegeng

Gregory C Sosinski

Todd M Austin

A method of use of real time machine control software integrating both event based mode and task based components. In particular, a collection of constructs have been created that allow machine control applications to be expressed in event based terms and the event based constructs to be seamlessly integrated with task based constructs. The method includes the use of response time specifications, in particular in conjunction with ReactiveTask and Task constructs. The method also includes the use of Register, ReferenceClock, and SchedulerLock constructs.

Machine control using a schedulerlock construct

Machine control integrating event based model with task based model

Machine control using response time specifications from sequential and state machine modes

Machine control using register construct

Machine control using a ReferenceClock construct

A system for submitting upgrades to software which operates a digital printer. The software enters the printer through a standard printer port. When an upgrade is sent, the status pins are reassigned new functions relating to the progress of the software upgrade, instead of using the status pins of the printer port in a standard fashion for submitting print data. In upgrade mode, the levels of the status pins are recognized as a multi-bit word, relating to a specific condition of the upgrade.

Submitting software upgrades to a digital printer through a standard port

An image data transfer architecture in which control data and image data are isolated is provided. Bidirectional buffers isolate data buses from the control bus, thereby allowing control to be maintained by an 8-bit programmed microprocessor. The controller microprocessor does not handle image data thereby reducing complex software and support components required of prior multiple 16- and 32-bit microprocessor controller systems. Isolation is achieved by having multiple data buses handling image data at various stages of processing, such as, for example, input image data, compressed image data and output image data. Additional efficiencies are realized by eliminating the inherent delays caused when high speed image output terminals are forced to share data buses with much lower speed image input terminals.

Image data transfer architecture and method for an electronic

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Fairport, NY, United States of America

Thomas G Beaman