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From: ckp@grebyn.com (Checkpoint Technologies)
Newsgroups: comp.sys.amiga
Subject: Re: DMCS & MIDI guru problem
Summary: Simple solution
Keywords: help!
Message-ID: <19419@grebyn.com>
Date: 26 Feb 90 15:06:28 GMT
References: <1828@esunix.UUCP>
Reply-To: ckp@grebyn.UUCP (Checkpoint Technologies)
Organization: Grebyn Timesharing, Vienna, VA, USA
Lines: 25

In article <1828@esunix.UUCP> blgardne@esunix.UUCP (Blaine Gardner) writes:
>I'm posting this for a friend.
>
>He's running Deluxe Music Construction Set with a FB-01 (?) through a
>MIDI interface. Whenever he exits the program, the machine crashes. This
>only happens when he has been using the MIDI interface. Just using the
>Amiga's stereo output causes no problems.
>
>Is this a known problem? Is there a fix for it, or a new version of
>DMCS? He says that EA tells him they have stopped work on all music
>program for all platforms, and that they have no idea what is causing
>the crash.

	It is a known problem (well, to me at least).  It comes from
using the 1.3.2 serial.device.  The fix is simply to back-fit the 1.3
serial.device.

	The problem comes from the way DMCS exits after using MIDI.  It
performs a CLoseDevice, then pulls the io_Device pointer from the
request and performs a RemoveDevice() with that.  This is a bad
assumption on DMCS' part.  Prior to 1.3.2, the io_Device field still
contained the device address; it no longer does.  CBM probably shouldn't
have changed this behavior for 1.3.2, but I wouldn't flame them for it,
what DMCS is doing is "illegal".
io_Device field still contains the right value here.