More MIDI stuff

[media at mail1.nai.net]

At 11:47 AM -0400 06/24/98, Silence wrote:
>
>Also, the MIDI spec 1.0 says that the maximum recommended length for
>a MIDI cable is 50'.

Well, 49' if you convert it from metric :)

>After this, the capacitance of the cable rounds off the pulse edges too
>much to be useful.  When chaining together devices, the problem is less
>with losing data, than it is with the time delay becoming very noticable,
>i.e. the first synth sounds 50 milliseconds before the last synth, which
>is a VERY audible differnece.

No, the problem is losing data.  The only delay from a MIDI Thru is from
the optoisolator.  It is about 3uS.  To get a delay of 50mS you would have
to daisy chain over 16,000 MIDI Thrus.  Not even Vince Clarke has that much
gear :)

The limit on the number of MIDI Thru's is from distortion of the signal.
The rise of an optoisolator is only 3uS but it still isn't instantaneous.
So the cumulative effect of a number of optoisolators will shorten the time
of the individual bits eventually causing data to be lost.

PEACE OUT :)
MARK