[linux-audio-dev] non-standard uses of MIDI reserved system opcodes

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Subject: [linux-audio-dev] non-standard uses of MIDI reserved system opcodes
From: John Lazzaro (lazzaro_AT_CS.Berkeley.EDU)
Date: Fri Mar 28 2003 - 00:01:04 EET

Hi everyone,

There are 2 MIDI System Common opcodes (0xF4 and 0xF5) and 2 MIDI
System Realtime opcodes (0xF9 and 0xFD) that the official MIDI
standard reserves for future use.

I'm currently collecting examples of non-standard uses of these
opcodes in hardware and software (on MIDI 1.0 DIN cables and in other
hardware and software contexts). Examples I've collected so far are:

 -- 0xF9 as "MIDI Tick"

 -- 0xF5 for both "MIDI endpoint" and "virtual cable" selection

I'm doing this as part of the process of finishing:

http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-mwpp.txt
http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-guide.txt

It uses the semantics of the commands as part of its resiliency
scheme, and so knowledge of non-standard uses of the reserved commands
is needed to help craft resiliency logic for the opcodes. Probably
best to send the info directly to lazzaro_AT_cs.berkeley.edu, the topic
is too mundane for the list ... thanks in advance!

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John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley
lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro
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