Past Versions of
MIDI 2.0 Specifications
Found here are past revisions of MIDI 2.0 specifications. Some of these, such as MIDI-CI v1.1, may be useful for checking backward compatibility.
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MIDI-CI Version 1.1a
A few of the earliest MIDI 2.0 devices implemented MIDI Capability Inquiry (MIDI-CI) specification version 1.1.
UMP & MIDI 2.0 Protocol v1.0
This was the first published version of the Universal MIDI Packet (UMP) Format and MIDI 2.0 Protocol specification.