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First Error or Event Sensing

IP.com Disclosure Number: IPCOM000078848D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 3 page(s) / 40K

Publishing Venue

IBM

Related People

Crone, JG: AUTHOR

Abstract

This apparatus senses and indicates a multiple error or event pattern. It additionally indicates which one of a number of errors or events was the first to occur.

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First Error or Event Sensing

This apparatus senses and indicates a multiple error or event pattern. It additionally indicates which one of a number of errors or events was the first to occur.

In an operational system, such as a central-processing unit or a control unit which forms portions of a data processing installation, a first-to-occur error or event is likely to precipitate a generally predictable pattern of other related errors or events. The ability to identify and distinguish the first-to-occur error from the subsequent errors enhances the ability to correct the causes and the results of a malfunction.

In the circuit shown, three input conductors 10, 11 or 12 become active if errors A, B or C, or a combination thereof, occur. In actual practice such an apparatus would have a large number of such conductors, to accommodate the sensing of one or more of many errors which may occur. An error will turn on its respective latch or flipflop 13, 14 or 15. Each of these latches in turn drives a second latch 16, 17 or 18. In addition, latches 13-15 drive OR 19, whose output conductor 20 is connected through 50 nanosecond delay network 20A. Network 20A enables conductor 22A 50 nanoseconds after one of the latches 13-15 is turned on. This delay period is chosen to be shorter than the shortest time interval that can or is expected to occur between a first and a second error.

Conductor 22A is connected to each of the latches 16-18 and blocks turn-on thereof, once conductor 22A is enabled or becomes active.

Three drivers 21, 22 and 23 are connected to variably energize three lights 24, 25 and 26, respectively, from a source of voltage, not shown. The on-off state of the drivers is controlled by conductors 27, 28 a...