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From: dmb@wam.umd.edu (David M. Baggett)
Newsgroups: comp.sys.atari.st
Subject: Re: Running MIDI at 500KHz -- conclusions??
Message-ID: <1990Mar25.203915.8689@wam.umd.edu>
Date: 25 Mar 90 20:39:15 GMT
References: <1990Mar9.215613.17075@wam.umd.edu> <1436@uvm-gen.UUCP>
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Reply-To: dmb@wam.umd.edu (David M. Baggett)
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Bob Pegram, pegram@griffin.uvm.edu, writes:

>Conclusions?  I hope that doesn't mean the end of your experiments.  If
>it worked even at 125Khz, SGS net would be speeded up considerably,
>and 250Khz is faster than Localtalk (= Appletalk - runs at 230Khz).  I
>haven't got the specs for the optoisolators, but a quick trip to Radio Schnook
>could give you a good idea of the speeds tolerated.  Look for (rise)
>time or frequency related specs on the back of the bubble pack of
>isolators, or you could just proceed by trial and error (especially
>good if the isolators are not the only bottleneck).
>Hoping to hear more about it,
>

Well, it does mean the end of my experiments.  Unfortunately, you can't
set the ACIA to run at anything between 32.1K baud and 500K baud.  (You
can either set the divide value to 64 (~7K baud), 16 (31.2K baud), or
1 (500K baud)).  There's simply no way to specify any other divide
values.  Oh well...

Dave Baggett
dmb@cscwam.umd.edu