Yamaha MU80 Owner's Manual page 113

Operation
1 Make sure that the MU80 is properly connected to the device
and that the HOST SELECT switch is properly set.
When using the MIDI terminals, connect the MIDI OUT of the
MU80 to the MIDI IN of the data recorder. (See the illustrations
above.) Also, set the HOST SELECT switch to MIDI.
When using the TO HOST terminal, make sure that the HOST
SELECT switch is set corresponding to the device to be used. (Re-
fer to page 26 for more on host computer connections.)
2 Press the UTILITY button and select "DUMPOUT," then press
the ENTER button.
3 From the Dump Out menu, select the type of data to be sent:
All, Multi or Performance. Then, press the ENTER button to call
up the selected data dump.
UTILITY MODE
103