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Article #621Re: timing a software function via timer chip
From: thomas.j.roberts
Date: Tue, 05 Jun 1990 16:47
Date: Tue, 05 Jun 1990 16:47
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From article <23656@cc.usu.edu>, by JRD@cc.usu.edu (Joe Doupnik): > > If one takes a careful look at the IBM PC specs Timer channels 0, 1, > and 2 are nearly identical, but channels 0 and 1 are preallocated to memory > refresh and time of day. So, channel 2 is the only one free for ordinary > programming use.... Channel 2 is used to generate a pulse-train for the speaker. You can safely use it as described, and not bomb any program or driver on the PC; you should make sure that the routines being timed DO NOT generate any sound or cause ^G to be typed - those would cause your timing values to be wrong. Tom Roberts att!ihlpl!tjrob
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!cbnewsc!tjr From: tjr@cbnewsc.att.com (thomas.j.roberts) Newsgroups: comp.sys.ibm.pc.programmer Subject: Re: timing a software function via timer chip Message-ID: <1990Jun5.164723.13091@cbnewsc.att.com> Date: 5 Jun 90 16:47:23 GMT References: <23656@cc.usu.edu> Organization: AT&T Bell Laboratories Lines: 15