Connecting standard MIDI out DIN connector
to the “gameport” of sound card.
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Notes:
1. Optocoupler is 6N137 type or equivalent.
2. Used resistors has tolerance 5% (or better).
3. "A" inverter may be realized by suitable IC (e.g. 74HC04) or transistor.
4. Pin No. 2 of MIDI IN connector can't be connected to ground of Soundcard.
NC = not connected
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