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That right there is a screenshot of MIDI-OX displaying data coming into a MIDI port, including a START and STOP message. This wouldn’t be anything too special, except for that it’s coming out of the SYNC port of Ivan’s P3, which means that the MIDI Sync issue which I’d previously mentioned is now resolved.
It turns out the problem was related to some changes which Colin had made in order to eliminate unintended triggering of the PICs inputs. It appears that this new code was mostly a backport of the firmware for the v1.6 boards (these are v1.5) which included the function for DIN SYNC passthrough, but doesn’t seem to default to having MIDI sync on.
The solution is to boot the P3 while holding down the 1 key. It will then tell the PIC to flip into MIDI mode, the PIC will write 00 to the first byte of its EEPROM (so it always goes into MIDI mode in the future), and then as soon as it first receives a RUN command it’ll start spraying out the clock / start / stop commands seen above.
I guess if I had been better (or more thorough) at reading disassembled PIC code I could have seen it doing all of this, but I’m not really that familiar with it yet, and I didn’t want to spend six hours looking up opcodes I didn’t understand and what each register written to was. Ah well, at least it’s working and I know what happened. Now I just have to pack it up and get it back to Ivan.