
I need some too and last i looked they were expensive and of lower quality than my old ones. Really your best option is to find a real MIDI cable which connects to the game port. This will not work for DOS games though and I am unclear how it might affect Windows applications that aren't for music production.

I could look for the manual and try to scan the pinout if you feel like making your own cable and trying the Yamaha drivers. I can't answer your USB question, but I do have both bibles that came with the thing and Yamaha include a diagram for the serial port for which I also seem to think I have a drive.

I own an MU90R, great synth, beats the crap out of anything Roland ever made back then anyway.
