XP-10: Function of the Computer Switch and MIDI Jacks
When the computer switch is set to MIDI:
In this mode, the MIDI IN and OUT connectors work the same as they would on any
MIDI instrument. To use it with a computer, a MIDI interface is required. The
computer connection is inactive in this mode.
When the computer switch is set to PC-2 or Mac:
In this mode, the device acts as it's own interface and can be connected
directly to a serial port on a computer. The MIDI OUT connector is disabled but
the MIDI IN connector is still active.