Browse Prior Art Database

I/O Adapter Isolation for Computer System

IP.com Disclosure Number: IPCOM000089986D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Tate, RD: AUTHOR

Abstract

The circuit selectively isolates a faulty I/O device which is a part of a computer system. Latch 10 is coupled to each I/O adapter. The set output of latch 10 is coupled on line 18 to each of the channel line drivers 12a...12n associated with that adapter. The adapter isolation latch can be set by a signal on line 14 by the use of normal input/output instructions of the computer system and reset by a signal on line 16. The setting of latch 10 operates to inhibit the output of all the channel line drivers from that adapter by the signal on line 18. Thus, a faulty I/O device can be readily located under program control by selectively isolating the adapters. The faulty device can be maintained in the isolated state under program control until repair work is completed.

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I/O Adapter Isolation for Computer System

The circuit selectively isolates a faulty I/O device which is a part of a computer system. Latch 10 is coupled to each I/O adapter. The set output of latch 10 is coupled on line 18 to each of the channel line drivers 12a...12n associated with that adapter. The adapter isolation latch can be set by a signal on line 14 by the use of normal input/output instructions of the computer system and reset by a signal on line 16. The setting of latch 10 operates to inhibit the output of all the channel line drivers from that adapter by the signal on line 18. Thus, a faulty I/O device can be readily located under program control by selectively isolating the adapters. The faulty device can be maintained in the isolated state under program control until repair work is completed.

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