1
John W Irwin: System for arbitrating use of I/O bus by co-processor and higher priority I/O units in which co-processor automatically request bus access in anticipation of need. International Business Machines Corporation, Richard E Cummins, J B Kraft, Thomas E Tyson, October 27, 1987: US04703420 (76 worldwide citation)

A data processing system having a main processing unit, a memory subsystem, and a co-processor selectively connectable to said memory subsystem through an Input/Output Channel Controller which includes a control means for arbitrating access to the I/O Bus among the co-processor and the other I/O dev ...


2
John W Irwin: Method and apparatus for controlling drying and detaching of printed material. IBM Corporation, Allan Ratner, Homer L Knearl, September 4, 1984: US04469026 (66 worldwide citation)

Printer having a sheet feed and drum transport assembly, an exit assembly and at least one dryer. Various print parameters or conditions are monitored relating to the drying of the ink on print media. These print parameters include print data density, ink characteristics and ambient humidity. The mo ...


3
John W Irwin: Processor I/O and interrupt filters allowing a co-processor to run software unknown to the main processor. International Business Machines Corporation, Douglas H Lefeve, September 22, 1987: US04695945 (58 worldwide citation)

A co-processor is connectable to a main system data bus to run software unknown to the main processor. The main processor can concurrently run other software and maintains priority over shared I/O facilities by providing trapping logic incorporated in a random access memory and dynamically loadable ...


4
John W Irwin: Blowoff baffle. General Electric Company, Frank P Giacalone, Francis H Boos, January 4, 1977: US04000779 (28 worldwide citation)

The present invention provides a condensate guide arranged in the path of a flow of air through an A-coil heat exchanger including slabs oriented generally horizontally relative to the air flow. The condensate guide is positioned downstream of the heat exchanger so that condensate when blown from th ...


5
Patrick A Buckland, John W Irwin, Jack E Reeder: Logical arrangement for controlling use of different system displays by main proessor and coprocessor. International Business Machines Corporation, Richard E Cummins, July 12, 1988: US04757441 (26 worldwide citation)

A method and system for controlling the display of data in a data processing system that includes a main processor, a memory subsystem, and an Input/Output subsystem which includes an I/O Channel Controller for managing traffic on an I/O bus having an attached co-processor and a plurality of I/O dev ...


6
Patrick A Buckland, John W Irwin, Jack E Reeder: Logical arrangement for controlling use of different system displays by main processor and co-processor. International Business Machines Corporation, Richard E Cummins, May 23, 1989: US04833596 (25 worldwide citation)

A method and system for controlling the display of data in a data processing system that includes a main processor, a memory subsystem, and an Input/Output subsystem which includes an I/O Channel Controller for managing traffic on an I/O bus having an attached co-processor and a plurality of I/O dev ...


7
Richard G Fogg Jr, John W Irwin: Data processing system with multi-access memory. International Business Machines Corporation, Thomas E Tyson, April 16, 1991: US05008816 (18 worldwide citation)

A memory system that includes several memory locations connected to a reading circuit that provides read access to the memory location. The memory system also includes the controller that receives control information. A writing circuit is further included that provides write access to either only a ...


8
John W Irwin: System for controlling and sequencing a printer. IBM Corporation, Allan Ratner, Carl M Wright, June 30, 1981: US04275968 (13 worldwide citation)

Printer having a sheet feed and drum transport assembly and an array transport assembly, these assemblies having critical operating parameters whose profile is measured during a nonprinting cycle executed for that purpose. These critical operating parameter values are sorted and used as the values o ...


9
Phil H Hall, John W Irwin: Multimode programmable machines. International Business Machines Corporation, Herbert F Somermeyer, June 21, 1977: US04031521 (9 worldwide citation)

The disclosure teaches that a cyclable program loop can be alternatively used to selectively initiate subprograms or as a timing signal generator, the latter preferably in a maintenance mode of a machine in which the loop resides. A programmable machine has a cyclable program loop with a preset numb ...


10
John W Irwin, James D Wagoner: Serial link transparent mode disparity control. International Business Machines Corporation, Douglas H Lefeve, August 22, 1989: US04859815 (6 worldwide citation)

In a serial link in which it is necessary to occupy the link before and after transmission of a frame by sending a succession idle characters having alternating disparity effects, the disparity effect of the last character in the frame is compared with the disparity effect that would be produced by ...