Re: Programming for High Baud Rates

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Article #15702

#15702

From: Larry Rosenstein
Date: Wed, 22 Apr 1987 18:38

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In article <648@apple.UUCP> huxham@apple.UUCP (Fred Huxham) writes:
>2)  Most code that talks directly with communication hardware has timing
>sensitive loops (at least mine did).  Don't assume the speed of the 
>CPU you're running on.  At startup you can execute a DBRA loop a good number
>of times and see how long it takes you.  From this you can calculate how
>fast your CPU is and adjust all of your timing sensitive loops accordingly.

Inside Macintosh Volume V defines a new global variable called TimeDBRA,
which defines the speed of the processor in this way.  This is discussed in
the Start Manager chapter.

Larry


-- 
Larry Rosenstein

Object Specialist
Apple Computer

AppleLink: Rosenstein1
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References: <MS.V3.18.rs4u.80022e03.dorrance.ibm032.743.6@andrew.cmu.edu> <441@wang.UUCP> <8602@clyde.ATT.COM> <648@apple.UUCP>

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!rutgers!mit-eddie!genrad!decvax!decwrl!nsc!voder!apple!lsr
From: lsr@apple.UUCP (Larry Rosenstein)
Newsgroups: comp.sys.mac
Subject: Re: Programming for High Baud Rates
Message-ID: <651@apple.UUCP>
Date: Wed, 22-Apr-87 13:38:05 EST
Article-I.D.: apple.651
Posted: Wed Apr 22 13:38:05 1987
Date-Received: Fri, 24-Apr-87 05:23:02 EST
References: <MS.V3.18.rs4u.80022e03.dorrance.ibm032.743.6@andrew.cmu.edu> <441@wang.UUCP> <8602@clyde.ATT.COM> <648@apple.UUCP>
Reply-To: lsr@apple.UUCP (Larry Rosenstein)
Organization: Advanced Technology Group, Apple Computer
Lines: 23
Keywords: SCC, programming, compatibility, yuck

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