Nonsynchronous channel/DASD communication system

Details Nonsynchronous channel/DASD communication system Nonsynchronous channel/DASD communication system

1990-08-31

1992-10-13

Fleming, Michael R.

Boots, shoes, and leggings

395250, 364DIG1, 3642394, 3642397, 3642383, 3642419, 3642481, 3642706, G06F 1312

Patent

active

051558149

ABSTRACT:
A control unit for DASD operation to transfer data between the device and a buffer and between a channel and a buffer. In that manner the channel and device are enabled to transfer data independently of each other. Mechanisms are provided for communication between the channel interface process in the control unit and the device interface process in the control unit. Some of these mechanisms are stored with the record in the buffer and others are stored in control storage. Principle communicating mechanisms include a device record pointer, a channel record pointer, a next operation field, a device state indicator, record control flags, and two buffer pointers.

REFERENCES:
patent: 4571674 (1986-02-01), Hartung
patent: 4636946 (1987-01-01), Hartung et al.
patent: 4779189 (1988-10-01), Legvold et al.
patent: 4780808 (1988-10-01), Moreno et al.
patent: 4868734 (1989-09-01), Idleman et al.

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