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From: lui@CS.UCLA.EDU
Newsgroups: rec.music.synth,comp.sys.mac
Subject: Problem with serial port and a MIDI interface
Message-ID: <8572@shemp.UCLA.EDU>
Date: Mon, 12-Oct-87 01:09:48 EDT
Article-I.D.: shemp.8572
Posted: Mon Oct 12 01:09:48 1987
Date-Received: Tue, 13-Oct-87 01:45:08 EDT
Sender: root@CS.UCLA.EDU
Reply-To: lui@CS.UCLA.EDU (Stephen Lui)
Organization: UCLA Computer Science Department
Lines: 27
Xref: mnetor rec.music.synth:1636 comp.sys.mac:8017

I been having alot of problems with my Passport MIDI interface. It connects to
the modem serial port of my Mac. I've determined that there is something wrong
with my modem serial port. I went to a friend's house; he has the exact same
computer and interface. I replaced my Mac with his and the system doesn't work.

What's really odd is that I've been using my serial port for my modem for
a long time without any problems. If I connect my MIDI interface and 
bring up a terminal emulator and type something, my Yamaha FB-01 Tone
Generator says "MIDI Error", which means something is getting through.

I suspect that the power pin on my serial port is bad. My modem does not use
a pin for power, but I think the passport midi interface uses power to run
the MIDI clock circuit.

Any ideas?

	Stephen Lui
	UCLA Department of Computer Science and

	Hughes Aircraft Company
	2000 E. Imperial Hwy.
	El Segundo, CA

	(213) 305-2085

	ARPA:  lui@cs.ucla.edu
	UUCP:  ...!{cepu,ihnp4,trwspp,ucbvax}!ucla-cs!lui