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From: terry@comcon.UUCP (Terry LaGrone)
Newsgroups: comp.sys.amiga
Subject: Re: Problems w/MIDI
Summary: Had a similar problem and ...
Keywords: MIDI
Message-ID: <450@comcon.UUCP>
Date: 23 Jul 90 18:53:45 GMT
References: <3976@rodan.acs.syr.edu>
Organization: Computer Connection, Anchorage Alaska
Lines: 21

In article <3976@rodan.acs.syr.edu>, lcbrink@rodan.acs.syr.edu (Lee C. Brink) writes:
> 
> 
>   Now for the problem:  There is no output on the midi lines.  The software,
> synth, and interface works fine straight out of the box on an Amiga 500
> with Workbench/ROM 1.3, but on my 2500 there is no output whatsoever on
> the midi cables (Checked with a MIDI tester).  I have tried new CIA's, 
> removing the 2620 board, removing the 2090a (Throwing it out a window :-)
> but with no success.  Now here's the kicker - My modem works fine plugged
> into the pass-thru of the MIDI interface.  Does anyone have any clue
> as to reasons for MIDI not working?

    I had a similar problem and traced it to a "weak"  RS-232 driver chip.
Try some other midi software first, surprisingly, a weak chip causes some
software to break on MIDI, but not all.  DMCS worked with the weak chip.

Replacing that chip cured all ills.  If you are a tech, place scope leads on
input and output of RS-232 driver to verify.

Terry LaGrone
"Mixing audio, video and ideas"\