Re: How can I determine the clock frequency on an 80xxx machine??

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#3680

From: Jerzy Tarasiuk
Date: Wed, 07 Oct 1992 20:46

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>>>>> On Wed, 30 Sep 1992 13:42:48 GMT, menglund@unpcs1.cs.unp.ac.za (menglund) said:
m> I am wanting to know how to determine a machines clock frequency dynamically
m> within a program. (eg: 8MHz, 16MHz ect).
m> Purpose:
m>   I need to know this to program the timer chip (8253) correctly on an
m>   Analog to Digital card. The boards Timer derives its frequency from the
m>   mother-boards clock. To make my program portable to different speed
m>   machines (80xxx architecture) I have to determine what the mother-boards
m>   clock frequency is!

I don't see necessity to determine machine clock frequency. You can
compare periods on the ADC board timer chip and main board timer chip
(which has always same frequency on its input). Just the 8253 on the
ADC card makes the simplest way to determine the clock frequency!

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References: <menglund.1.717860568@unpcs1.cs.unp.ac.za>

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!sunic!fuw.edu.pl!cocos!jt
From: jt@fuw.edu.pl (Jerzy Tarasiuk)
Subject: Re: How can I determine the clock frequency on an 80xxx machine??
In-Reply-To: menglund@unpcs1.cs.unp.ac.za's message of Wed, 30 Sep 1992 13:42:48 GMT
Message-ID: <JT.92Oct7214603@fizyk1.fuw.edu.pl>
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Organization: Warsaw University Physics Dept.
References: <menglund.1.717860568@unpcs1.cs.unp.ac.za>
Date: Wed, 7 Oct 1992 20:46:03 GMT
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