problems with rnd# from assembler

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Article #26882

#26882

From: Guy Ridley
Date: Tue, 19 May 1987 00:06

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Does anyone have some good documentation on calling trap #17 (the random
number generator) from assembler?  Acc'd to what I have the rnd# generator
is reseeded when the machine is turned on, and calling trap #17 puts a
random number in D0.  However, what I seem to be getting (based on what
note comes out of my synthesizer, to which the contents of D0 are sent via
MIDI) is a lot of decimal "40"'s.  This is completely mystifying, and the
Assempro documentation doesn't say much more that "ST Internals" does.
Can anyone send me a small sample of such a call that works? 
 
Also, I would like to communicate with others who are doing MIDI & Assembler.
My synth is a DX-7.

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!ll-xn!ames!ptsfa!pbhya!gdr
From: gdr@pbhya.UUCP (Guy Ridley)
Newsgroups: comp.sys.atari.st
Subject: problems with rnd# from assembler
Message-ID: <2088@pbhya.UUCP>
Date: Mon, 18-May-87 20:06:25 EDT
Article-I.D.: pbhya.2088
Posted: Mon May 18 20:06:25 1987
Date-Received: Tue, 19-May-87 06:19:42 EDT
Organization: Pacific * Bell, San Ramon, CA
Lines: 12
Keywords: midi/rnd#