Steinberg CARD 32 Midi Interface/Pro16 for Commodore C64 | #482568691
FB-MIDI A modern MIDI interface « My Commodore 64
Commodore 64 User Port Project Development PCB - Share Project - PCBWay
Kerberos - C64 MIDI Interface
COMMODORE 64 SYNTH KNOB INTERFACE FOR CYNTHCART MEGAMOD - YouTube
My C64 MIDI Interface recreation has moved from KiCAD to physical form. SGS Thompson EF6850 ACIA chips are a few days away from being at my front door : r/c64