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Featured researches published by John W. Irwin.


Ibm Journal of Research and Development | 1971

The IBM 3803/3420 magnetic tape subsystem

John W. Irwin; John V. Cassie; Harlyn C. Oppeboen

The design innovations in the IBM 3803 Tape Control Unit and the IBM 3420 Magnetic Tape Unit are discussed. The new design concepts include a full readback parity check, a system of microprogram control that obtains high operating rates through overlap of channel control and motion control functions, a new phase-error detection system, a modified dual-density recording feature and a new interface between the control unit and tape drive. The combination of novel error detection methods, control features and programming support (including an expanded scheme of on-line diagnostics) contributes to greatly improved total system performance over previous models of tape subsystems.


Archive | 1984

Method and apparatus for controlling drying and detaching of printed material

John W. Irwin


Archive | 1985

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

John W. Irwin


Archive | 1987

Processor I/O and interrupt filters allowing a co-processor to run software unknown to the main processor

John W. Irwin


Archive | 1972

Error detection and correction systems

Ernest William Devore; John W. Irwin


Archive | 1987

Logical arrangement for controlling use of different system displays by main proessor and coprocessor

Patrick Allen Buckland; John W. Irwin; Jack Erwin Reeder


Archive | 1971

DATA PROCESSING SUBSYSTEMS

Gene H. Edstrom; Russell Merritt Elwell; John W. Irwin


Archive | 1971

BRANCH CONTROL FOR A DIGITAL MACHINE

Gene H. Edstrom; John W. Irwin


Archive | 1979

System for controlling and sequencing a printer

John W. Irwin


Archive | 1987

Data processing system with multi-access memory

Richard G. Fogg; John W. Irwin

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