Date: Mon, 7 Aug 2000 15:22:15 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: fx DOT maletras AT kingston DOT ac DOT uk
cc: djgpp AT delorie DOT com
Subject: Re: PC-based instrumentation problem
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On Mon, 7 Aug 2000 fx DOT maletras AT kingston DOT ac DOT uk wrote:

> I wrote a simple program in TC++ for DOS that  performs a signal
> acquistion.

Then why do you post here?  This forum has nothing to do with TC.

> It works perfectly OK in DOS 7.0 but when I try to run it from
> Windows95, the ISR timimg is not accurate ie my sampling period is not
> constant

Windows 9X tries to virtualize the timer chip, but it doesn't do a very 
good job.  In particular, if you switch the DOS box into background 
(i.e., move the mouse focus away from it), your program will not get 
timer interrupts at all (or get only a very small fraction of them)!