1986 May 56/1 Let's construct a MIDI interface card for the Commodore 64..then write some software that dynamically tests the card and can serve as a starting point for your own experiments.
1996 C. Jenkins in P. Trynka 62/1 Third party designers came up with MIDI interface boxes for Apple II, Kaypro, Commodore 64 and even Sinclair Spectrum computers.