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From: dat33228@uxa.cso.uiuc.edu (Derek A. Taubert)
Newsgroups: comp.sys.next
Subject: Re: How to hook up a MIDI keyboard to your NeXTstation...
Message-ID: <1991May25.030820.14681@ux1.cso.uiuc.edu>
Date: 25 May 91 03:08:20 GMT
References: <1991May20.122642.25274@wam.umd.edu>
Sender: usenet@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
Lines: 30

rgc@wam.umd.edu (Ross Garrett Cutler) writes:

>To make the above change, I opened up their cable and shorted the yellow,
>black and blue wires together.  The resultant cable is symmetric.

Yuck..  I have one fundamental problem with this:  The lines you are shorting
to ground are labeled as RTS and CTS on the NeXT side of the connector.  It
would be in your best interest to cut these lines leading from the computer,
to avoid shorting the 10 volts (or whatever it is) that those signals might
be producing.  This is generally not good for hardware.

>I tested it on my NeXTstation running 2.1, hooked up to a CZ-1.  MIDI in
>(e.g. using the CZ-1 as a controller for Ensemble) will actually work 
>without the above hack, but MIDI out (using the CZ-1 as another 8 voices)
>won't (unless you do the hack, of course).

Well, this is most likely due to CTS being low (as it should from the hack)
and RTS being high.  If a short program existed that could change these
signals whenever, you could save yourself the trouble of making a new cable.
I'm new to NeXT programming, and I have no idea if you would even be able to
modify such things while another process had "control" of the device.  ie :
device busy problems.

Derek
--
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