This is an old page with the first prototype, with TTL chips only, which had problems with flash access on some computers, see here for a modern version.
Eagle schematic (revision 0.3): midi.sch (midi.pdf)
Eagle board (revision 0.3): midi.brd
First prototype (revision 0.1):
All sources for the cartridge, with the menu system for the file transfer etc. (needs some cleanup) : c64.zip
Qt test program for MIDI file upload: qt.zip
18. Januar 2014, Frank Buß