Dual mode I/O

Details Dual mode I/O Dual mode I/O

1982-02-02

1985-01-08

Thomas, James D.

Boots, shoes, and leggings

178 2209, G06F 300, G06F 1506

Patent

active

044930283

ABSTRACT:
This secondary processing attachment to a primary (host) data processing system provides a dual mode I/O operation having unique "real time" applications. In this mode the attachment subsystem may exchange data concurrently with two potentially separate storage areas in host system main storage, under the direction of a single device control block (DCB) command descriptor prepared by host system software. Examples of real time processing applications include encryption and decryption of "secure" data by the attachment subsystem, matrix multiplication, or signal processing operations by the subsystem, and conservative movement of data between host storage and process control devices which link to the attachment subsystem via a device multiplexor and are co-addressed with that subsystem (by the host system).

REFERENCES:
patent: 3909799 (1975-09-01), Recks et al.
patent: 4093981 (1978-06-01), McAllister et al.
patent: 4099236 (1978-07-01), Goodman et al.
patent: 4115852 (1978-09-01), Rozell
patent: 4184200 (1980-01-01), Wagner et al.
patent: 4246637 (1981-01-01), Brown et al.
patent: 4247893 (1981-01-01), Anderson et al.

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