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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Problems with a TIMER
References: <b15mm5$rgk$1@e3k.asi.ansaldo.it>
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> The target is a processor x86 Family 6 Model 7 Stepping 3 AT/AT COMPATIBLE
> The results change if I use video-outputs or not (PUT("START TIMER"),
> PUT("-"), PUT("TIME OUT") are now commented into the code).
> Why?
  In what way do the results change?  What compiler, OS, and motherboard
chip set do you have - see MS Knowledgebase article Q274323.
  There was a problem with certain chipsets and MS Windows that caused
the machine clock to appear to jump forward 2**24 ticks (several seconds)
if you did multiple clock reads with less than several microseconds
between them.  Gnat 3.15 fixed that, but introduced a new clock error,
which I reported and they say they've fixed for future versions.  Janus
has a version with the fix, but I don't know about other compilers.