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Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!accelerator.eng.ohio-state.edu!czei
From: czei@accelerator.eng.ohio-state.edu (Michael S. Czeiszperger)
Newsgroups: comp.sys.mac,rec.music.synth
Subject: Re: DIY MIDI interface?
Keywords: MIDI
Message-ID: <1324@accelerator.eng.ohio-state.edu>
Date: 3 Jan 89 13:48:02 GMT
References: <817@ttrdf.UUCP> <6636@killer.DALLAS.TX.US>
Reply-To: czei@accelerator.eng.ohio-state.edu (Michael S. Czeiszperger)
Organization: The Ohio State University Dept of Electrical Engineering
Lines: 18

In article <6636@killer.DALLAS.TX.US> sp@killer.DALLAS.TX.US (Steve Parker) writes:
>[...]  The only trick is you have to pump a 500k/1M/2M (depending on
>software) clock signal back into the ext clock line, since there is no way
>to divide the internal clock in the SCC to get 31.25k baud.  Also, you DO

I built mine with a 500kHz clock, but later changed it to 1MHz because
of compatibility problems.  Yes, you would think Mac MIDI software
should be able to handle all three clock speeds, but in practice,
the default is *always* 1MHz, and some software doesn't support anything
else.  If you're building your own, save yourself some hassles and
use a 1MHz clock.  


-- 
Michael S. Czeiszperger   | "milihelen: The amount of beauty required to launch
Systems Analyst           |             a single ship."
The Ohio State University | 2015 Neil Ave, Columbus, OH 43210
ARPA:czei@icarus.eng.ohio-state.edu  PAN:CZEI (614) 292-0161