Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!edcastle!hwcs!neil
From: neil@cs.hw.ac.uk (Neil Forsyth)
Newsgroups: comp.sys.atari.st
Subject: Re: Call for opinions
Message-ID: <4554@brahma.cs.hw.ac.uk>
Date: 2 Mar 90 10:16:54 GMT
References: <2059@atari.UUCP>
Reply-To: neil@cs.hw.ac.uk (Neil Forsyth)
Organization: Computer Science, Heriot-Watt U., Scotland
Lines: 34

In article <2059@atari.UUCP> apratt@atari.UUCP (Allan Pratt) writes:
>Without going into the gory details, I want to know what you
>programmers out there think of adding the following constraint to
>programming on the ST line of machines:
>
>    "You must leave Timer C in the MFP as it was originally programmed."
>...
>I don't want to make this decision in a vacuum.  What do you all think?

Well the Timer C interrupt seems to be quite an important issue when trying to
achieve stable colour screen interrupts. Degas Elite subverts Timer C
completely during screen interrupts and Neochrome lowers the IPL level.
My own technique follows the Neochrome example and I believe is less traumatic
to the system but would welcome Atari's own thoughts on it.
None of our handlers change the timers characteristics though so I guess I'm
voting with Allan on this.

>============================================
>Opinions expressed above do not necessarily	-- Allan Pratt, Atari Corp.
>reflect those of Atari Corp. or anyone else.	  ...ames!atari!apratt

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!                                                                             !
! Neil Forsyth                       JANET:  neil@uk.ac.hw.cs                 !
! Dept. of Computer Science          ARPA:   neil@cs.hw.ac.uk                 !
! Heriot-Watt University             UUCP:   ..!ukc!cs.hw.ac.uk!neil          !
! Edinburgh, Scotland, UK                                                     !
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