Path: utzoo!attcan!uunet!umich!iuvax!maytag!watstat.waterloo.edu!dmurdoch
From: dmurdoch@watstat.waterloo.edu (Duncan Murdoch)
Newsgroups: comp.lang.pascal
Subject: Re: Timing in Turbo Pascal
Message-ID: <1990Oct28.142118.6756@maytag.waterloo.edu>
Date: 28 Oct 90 14:21:18 GMT
References: <2280@oucsace.cs.OHIOU.EDU> <5307@crash.cts.com>
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In article <5307@crash.cts.com> nkraft@crash.cts.com (Norman Kraft) writes:
>In article <2280@oucsace.cs.OHIOU.EDU> tswingle@oucsace.cs.ohiou.edu (Tom Swingle) writes:
>>Does anybody know of a way to *accurately* time an event down to at least 1/100
>>of a second in Turbo Pascal?  I have tried using the GetTime procedure, but it
>>relies on DOS, which is only accurate to about 5/100 of a second. Turbo Pascal
>>has the Delay procedure which can accurately time to 1/1000 of a second.  Does
>>anybody know how they do this?
>
>Well, what they do, on an AT machine at least, is call a BIOS function which
>waits for a millisecond. 

Which version are you using?  On mine (5.5), all delay() does is run a 
do-nothing loop.  The loop gets calibrated during the startup.  Maybe that's
where you saw the BIOS call?  

Duncan Murdoch
dmurdoch@watstat.waterloo.edu