Not for Yamaha) USB IN-OUT Midi Interface Adapter Converter Cable Lead 1.8 meters - Connect Keyboard
USB & MIDI: Everything you need to know to get it right (USB MIDI Host vs Interface explained) - YouTube
Yamaha 4.9' USB to Apple 30-Pin MIDI Interface Cable I-UX1 B&H
Amazon.com: HQRP USB in-Out MIDI Interface Cable Converter PC to Music Keyboard Adapter Cord Works with Yamaha PSR-225GM 61 Key Educational Keyboard : Musical Instruments