This is a Yamaha XG card, the SW60XG to be exact. It’s an audio card for a PC which extends the MIDI basic to include over six hundred instruments. By today’s requirements the practically twenty year old card isn’t all that powerful, however it is fascinating to see it utilized as a standalone device.
[Benji Kimba] published the video summary of his job which you can view after the break. The picture above is discovered at about 2:35 seconds as well as about twenty seconds later you get a look at exactly how he patched into the conductors on the edge connector on both sides complied with by the MIDI in as well as out connections. Finally, we get a look at a appropriate schematic at the four minute mark which details the pull-up resistors, hardware reset circuit, as well as the optoisolator he added for the MIDI connections themselves.
[Thanks Gnif]