Troubles with UM-ONE USB-MIDI
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Sgw32 commented
MC6850 processes a constant output of 0xFE with this device.
Some more info here: https://www.vguitarforums.com/smf/index.php?topic=22712.0
It is called "Active Sense"
I can't flash anything to the device, because flashing corrupts while writing(and maybe it is related, maybe not)
Seems like Kerberos is for cheaper USB-MIDI devices ;)
Sgw32 commented
Now I can confirm that even if it puts 0xFE to the list of commands, flashing still works. It was a hardware fault.
Closing this issue. Solved: 0xFE does not interrupt flashing. Roland UM-ONE confirmed working.