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From: cetron@utah-cs.UUCP
Newsgroups: comp.sys.mac
Subject: Re: EXACT screen refresh rate, and other items
Message-ID: <4619@utah-cs.UUCP>
Date: Tue, 2-Jun-87 23:24:21 EDT
Article-I.D.: utah-cs.4619
Posted: Tue Jun  2 23:24:21 1987
Date-Received: Fri, 5-Jun-87 02:15:59 EDT
References: <71@wjh12.HARVARD.EDU> <1719@umd5.umd.edu> <2141@husc6.UUCP> <2895@cit-vax.Caltech.Edu>
Reply-To: cetron@utah-cs.UUCP (Edward J Cetron)
Organization: Center for Engineering Design, Univ of Utah
Lines: 11

In article <2895@cit-vax.Caltech.Edu> wetter@tybalt.caltech.edu.UUCP (Pierce T. Wetter) writes:
>    One thing that de-bouncing chips require is a debounce clock. Debouncer 
>chips work by remembering if the input lines have been toggled in the last
>x clock periods - about what the software does. Personally I'm not

	wrongo, a good switch debouncer can be made with a single quad nand
gate as I recall (ttl 7400??) and two jumpers...no clock not nothing, you
could also use a 555 timer in monostable mode, or even a one-shot......and
these chips in quantity aren't more than a penny or a dime..

-ed