How does MIDI-CI v1.2 stay compatible with MIDI 1.0 devices, and what happened to Protocol Negotiation?

MIDI-CI v1.2 keeps MIDI 1.0 devices working (backward compatibility as a design goal; messages travel as Universal System Exclusive) and, in version 1.2 (2023-06-15), deprecated Protocol Negotiation while adding Process Inquiry and Function Blocks. Curator qualifications: Specs read 2026-10-22; no MIDI files written or parsed. Rights hold: MMA/AMEI notice forbids reproduction or transmission in any form without written permission; quote briefly and link, do not redistribute the PDFs or extended text. Device ID addressing and message-version handling details from producer reading. Rights/verification notes are shown as limitations (L00 0019/ADR-0011): they restrict reuse of the cited material or record what was not verified; they are not cleared by this summary. Limitations: Specs read 2026-10-22; no MIDI files written or parsed. [component_reuse_restriction] Eligible with rights hold; T14 MIDI-CI compatibility. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://amei.or.jp/midistandardcommittee/MIDI2.0/MIDI2.0-DOCS/M2-104-UM_v1-1-1_UMP_and_MIDI_2-0_Protocol_Specification.pdf",
      "note": "M2-101-UM MIDI-CI v1.2, Background and Table 1 Version History"
    },
    {
      "url": "https://amei.or.jp/midistandardcommittee/MIDI2.0/MIDI2.0-DOCS/M2-101-UM_v1-2_MIDI-CI_Specification.pdf",
      "note": "M2-101-UM MIDI-CI v1.2, Background and Table 1 Version History"
    }
  ]
}