Owner's Manual
Page 157
... computer and sequence software you are using a USB cable to connect the PSR-2100/1100 to your computer, you must install the specified USB driver (YAMAHA USB MIDI Driver) to your computer before you can download a copy of the YAMAHA USB MIDI Driver free of the personal computer to the MIDI IN terminal... used when the USB terminal is being transferred, or returning from the XG Library on the state of your computer, the operating state of the PSR-2100/1100 using , refer to the relevant owner's manuals.
... computer and sequence software you are using a USB cable to connect the PSR-2100/1100 to your computer, you must install the specified USB driver (YAMAHA USB MIDI Driver) to your computer before you can download a copy of the YAMAHA USB MIDI Driver free of the personal computer to the MIDI IN terminal... used when the USB terminal is being transferred, or returning from the XG Library on the state of your computer, the operating state of the PSR-2100/1100 using , refer to the relevant owner's manuals.