Preventing initial program load failures

Details Preventing initial program load failures Preventing initial program load failures

1978-12-28

1980-12-02

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 300

Patent

active

042375339

ABSTRACT:
Means are provided to prevent the failure of an Initial Program Load (IPL) command in a data processing system because of a "busy" indication from a Direct Access Storage Device (DASD) control device which is executing the command. An IPL operation from a Central Processing Unit (CPU) involves the issuance of a System Reset signal to all channels and control units connected to the CPU, followed a short time later by a READ IPL command to the DASD control device controlling the DAS device which contains the program to be loaded. The present invention enables the system to distinguish between when a control device is busy with a System Reset procedure and when it is busy on other matters, and to permit the queueing of the READ IPL command when the control unit is busy and there is a System Reset operation pending so that the READ IPL command will not be rejected.

REFERENCES:
patent: 3716837 (1973-02-01), Waddell
patent: 3840864 (1974-10-01), Chang et al.
patent: 3911400 (1975-10-01), Levy et al.
patent: 4030073 (1977-06-01), Armstrong, Jr.
patent: 4040021 (1977-08-01), Birchall et al.
patent: 4079448 (1978-03-01), N'Guyen et al.
patent: 4093851 (1978-06-01), Paulinski

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