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The Serial Port MIDI Interface box
The Serial Port MIDI Interface (top)
The Serial Port MIDI Interface (bottom)
The Serial Port MIDI Interface Cable
The Serial Port MIDI Interface is designed to fit in an Archimedes computer's Econet socket and the cable connects to the Econet socket at the back of the computer. It has been designed to be compatible with the Acorn MIDI and responds to nearly all the same commands. The cable has a MIDI IN and MIDI OUT socket, the OUT socket is identified by the white band with an "O" on it.
The MIDI Interface card has an ST Microelectronics EF68B50P ACIA.
Here is the Vertical Twist MIDI Interface User Guide .
Here is an archive of The Serial Port MIDI Interface Control Software .