Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!dinghy.cis.ohio-state.edu!topping
From: topping@dinghy.cis.ohio-state.edu (brian e. topping)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Serial Driver Query
Keywords: help, programming, serial
Message-ID: <34829@tut.cis.ohio-state.edu>
Date: 12 Feb 89 07:51:18 GMT
References: <2411@masada.cs.swarthmore.edu>
Sender: news@tut.cis.ohio-state.edu
Reply-To: brian e. topping <topping@cis.ohio-state.edu>
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Organization: Ohio State University Computer and Information Science
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To get the Mac to listen to a clock rate that is not listed in the standard
list, you need to have a signal coming in on pin 2 that has a synthesized
clock of the proper speed.  Then you have to throw a few registers in the
SCC to get things synched properly.  I am no expert on this, but have some
experience with doing MIDI on the Mac.  MIDI uses a 31.25KHz clock for
transmission.  You may want to look up some articles on doing MIDI interfaces,
including the hardware (MacTutor, Oct. '85) and the software drivers (MT, 
July '87).  Hope this helps --bri