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Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!ihlpf!straka
From: straka@ihlpf.UUCP
Newsgroups: comp.sys.mac
Subject: Re: EXACT screen refresh rate, and other items
Message-ID: <1642@ihlpf.ATT.COM>
Date: Thu, 4-Jun-87 09:00:57 EDT
Article-I.D.: ihlpf.1642
Posted: Thu Jun  4 09:00:57 1987
Date-Received: Sat, 6-Jun-87 08:11:43 EDT
References: <71@wjh12.HARVARD.EDU> <1719@umd5.umd.edu> <2141@husc6.UUCP> <2895@cit-vax.Caltech.Edu> <4619@utah-cs.UUCP>
Reply-To: straka@ihlpf.UUCP (55223-Straka,R.J.)
Organization: AT&T Bell Laboratories
Lines: 25

In article <4619@utah-cs.UUCP> cetron@utah-cs.UUCP (Edward J Cetron) writes:
>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

>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..

Yes, the individual part is cheap.  Now add the 3 or 4 discretes to hang
on to it, the extra 1/3 to 1/2 sq. in. of board space, and its cost on a
4-layer board, potential extra cabinet volume (with additional plastic
cost), the extra cost of board failures (from random defects on the
board itself, assembly (soldering) or doa chips), the extra power to
supply the chip, extra heat to get rid of, ... Need I go on?  You can
nickel and dime a machine to death, unfortunately. 

There are a lot of overhead costs in electronic design and assembly.  I
still consider it amazing that Apple was able to integrate all the Mac
functionality on that tiny little board, anyway.  My desk also
appreciates it. 
-- 
Rich Straka     ihnp4!ihlpf!straka

Advice for the day: "MSDOS - just say no."