Nonsynchronous DASD control

Details Nonsynchronous DASD control Nonsynchronous DASD control

1990-08-31

1992-10-20

Fleming, Michael R.

Boots, shoes, and leggings

364DIG1, 3642383, 3642397, 3642481, 3642601, G06F 1312

Patent

active

051577704

ABSTRACT:
Apparatus for controlling DASD in a manner that is not synchronous with channel operation, that is, transfer of commands and data are not limited to inter-record gap periods. A device interface processor controls which recording track is accessed by the DASD with data being transferred to and from a buffer. A device track indicator designates which recording tracks the device will move to in sequence. A channel interface processor controls the movement of data from and to the buffer and channel. A channel track indicator designates the recording track sequence in which the channel interface processor will access the data to be transferred. A method of operation is disclosed for utilizing the two indicators to enable the device and channel processors to communicate with each other in case the device reads incorrect records in a multi-track read operation.

REFERENCES:
patent: 4262332 (1981-04-01), Bass et al.
patent: 4310882 (1982-01-01), Hunter et al.
patent: 4882671 (1989-11-01), Graham et al.

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