Kerberos is a MIDI interface for the C64 and C128 with integrated flash memory. Visit http://www.frank-buss.de/kerberos/index.html for more information.
Visit https://www.cubic.org/~doj/c64/kerberos/ to download the menu program and a OsX build of the QT transfer program.
Write an email to Dirk Jagdmann doj@cubic.org