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MIDI Drum Machine
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Midi Port Schematic

schematic diagram

This is the circuit suggested by the MIDI specification.

or skip to the firmware.

 

 

  Note: the new board will change the PC-900 to a 6N139, which is less expensive and more readily available.

The MIDI Drum Machine, Paul Stoffregen and Rod Seely.
Designed and constructed Fall, 1991. Project status: Complete.
http://www.pjrc.com/tech/midi-drums/sch-midi.html
Last updated: February 24, 2005
-- These drum-machine web pages are still under construction --
Questions, Comments?? <paul@pjrc.com>