Atari Mega Archive 1/Atari Mega Archive - Volume 1.iso/lists/mint/l_1199/998

Internet Message Format | 1994-08-27 | 1.8 KB

Date: Fri, 11 Feb 94 10:57:33 +0100
Date: Fri, 11 Feb 1994 09:55:05 +0000 (GMT)
Subject: [[e-mail]: Re: Load average patch for MiNT 1.09.]
Subject: Re: Load average patch for MiNT 1.09.
Date: Fri, 11 Feb 94 10:57:33 +0100
Message-Id: <[e-mail]>
To: [e-mail]
Subject: [[e-mail]: Re: Load average patch for MiNT 1.09.]

From: Stephen Usher <[e-mail]>
Subject: Re: Load average patch for MiNT 1.09.
To: schwab
Date: Fri, 11 Feb 1994 09:55:05 +0000 (GMT)
In-Reply-To: <[e-mail]> from "Andreas Schwab" at Feb 11, 94 10:50:06 am
Mime-Version: 1.0

>Stephen Usher <[e-mail]> writes:
>
>|> BUGS
>
>|>     The uptime and load average code uses the Vertical Blank Interrupt
>|>     to update its values and assumes that the interrupt will happen
>|>     60 times per second. This is a false assumption on PAL STs running
>|>     in either ST Low or ST Medium resolutions in which case the uptime
>|>     clock will run slow.
>
>It's worse than that, in ST High the frame clock is 72 Hz (on
>ST/STe's), and the uptime clock will run too fast. You should never
>make any assumptions about the frequency of the VBI. If you want a
>reliable clock, use etv_timer.

I could have used the 200Hz interrupt but decided that it'd probably use too
much CPU time for that. If anyone wishes to modify my patches to give a
better time accuracy it's fine by me! :-)

Steve

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