Launching cores causes UART reader to disconnect

[wizzomafizzo]

• On MiSTer. Can replicate (so far) with NES and PSX core.
• Can replicate by just using load_core .../NES.rbf > /dev/MiSTer_cmd
• Reader immediately reconnects for me, does not for other report, required service restart
• Only began happening after a recent MiSTer update, same TapTo version

[NolanNicholson]

It turns out the service restart in the NES core is only required if, in the NES core settings, "System" -> "UART mode" is set to "MIDI", with MidiLink also set to "USB." The initial MIDI handshake then crashes the UART reader.