Synthechnics

PC910 or TLP552 Korg M1 MIDI optocoupler

Your Korg M1 isn't receiving midi? Most likely, this is the problem.

PC900 optocoupler

Korg Poly 800. EX800, Poly 800 II, Sequential Drumtraks, Prophet 600, Prophet 2000, Roland Jupiter 6, Cheetah MS6, Kawai SX240, R100, Access Matrix Programmer

TLP552 optocoupler

Korg DW8000

PC410K optocoupler

used in Korg 01/W series

HCPL061A optocoupler

Novation Supernova II

6N138 Optocoupler

Siel DK70, DK80, DK700, Opera 6