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From: jpexg@rice-chex.ai.mit.edu (John Purbrick)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Reading the timer
Message-ID: <12455@life.ai.mit.edu>
Date: 18 Dec 90 06:24:14 GMT
References: <17750001@hpgnd.grenoble.hp.com> <2783@atari.UUCP>
Sender: news@ai.mit.edu
Organization: MIT Artificial Intelligence Laboratory
Lines: 16

In article <2783@atari.UUCP> apratt@atari.UUCP (Allan Pratt) writes:
>
>There is a system variable that holds the time since the system was
>booted, in 1/200ths of a second.  For measuring time spans, this works,
>but you still can't get real time-of-day any more precisely than two
>seconds.
>

Well--you could keep reading the seconds clock until it changes (thus giving
a fix for the end of a second) and store the contents of the 200ths-of-a-
second counter (or the 60ths/70ths, if you prefer it) at that moment. Then 
calculate the remainder when the difference between the count "now" and "then"
is divided by 200 | 70 | 60. This gives the number of time quanta since the 
last increment of the seconds clock.

John Purbrick