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Manual Clock Controls

IP.com Disclosure Number: IPCOM000098509D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Bahnsen, RJ: AUTHOR

Abstract

A large system maintenance console may include manually controlled triggers to provide four operation modes in addition to the normal clock operation. The distribution of alternate A and B clock pulses is stopped by setting an inhibit trigger 1. This is reset by any of five distribution start keys through the operation of a pair of triggers a and b. Trigger a is set by a pulse from any start key and by an A pulse to condition trigger b. This is set as soon as the start key pulse is removed and a B pulse is present. A pulse resets trigger a and the combination of a reset a with a set b is recognized as the condition to reset the clock inhibit trigger. This allows distribution of clock pulses, the first distributed pulse acting to reset trigger b.

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Manual Clock Controls

A large system maintenance console may include manually controlled triggers to provide four operation modes in addition to the normal clock operation. The distribution of alternate A and B clock pulses is stopped by setting an inhibit trigger 1. This is reset by any of five distribution start keys through the operation of a pair of triggers a and b. Trigger a is set by a pulse from any start key and by an A pulse to condition trigger b. This is set as soon as the start key pulse is removed and a B pulse is present. A pulse resets trigger a and the combination of a reset a with a set b is recognized as the condition to reset the clock inhibit trigger. This allows distribution of clock pulses, the first distributed pulse acting to reset trigger b.

This trigger interaction is common to all clock pulse distributing keys and insures that the clock pulses are distributed without slivers. For the start key, the inhibit trigger remains reset until a stop key is operated. The console includes three pulse keys to enable distribution of 1, 2 or 3 pulses, respectively. Each pulse key sets a corresponding trigger in addition to trigger a. The three pulse triggers are chained with the inhibit trigger, so that a distributed pulse with the 3 pulse trigger set, sets the 2 pulse trigger. A pulse with the 2 pulse trigger set sets the 1 pulse trigger. A pulse with a set 1 pulse trigger sets the inhibit trigger so that by setting the desired trigger, 1, 2 or 3 p...