Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!uunet!uvm-gen!pegram
From: pegram@uvm-gen.UUCP (pegram r)
Newsgroups: comp.sys.atari.st
Subject: Re: Running MIDI at 500KHz -- conclusions??
Message-ID: <1436@uvm-gen.UUCP>
Date: 21 Mar 90 16:40:14 GMT
References: <1990Mar9.215613.17075@wam.umd.edu>
Sender: nobody@uvm-gen.UUCP
Organization: EMBA Computer Facility, Univ. of Vermont, Burlington.
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From article <1990Mar9.215613.17075@wam.umd.edu>, 
by dmb@wam.umd.edu (David M. Baggett):

Description of results deleted to save B/W.

> I can only assume that the opto-isolators won't handle 500K baud.  It
> doesn't seem like a software problem.

> Dave Baggett
> dmb@cscwam.umd.edu

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,

Bob Pegram (Internet: pegram@griffin.uvm.edu, UUCP: go figure.)