Yamaha S90 ES Owner's Manual page 177

Utility mode
PlugInfo/Port (Plug-in board installation status)
Indicates the Plug-in board name and its MIDI port number
(page 167) at the right of the slot number. When
PolyExpand (page 167) is set to on in the Utility mode,
"P" is indicated at the left of the slot number.
MIDI IN/OUT
Indicates which physical output terminal(s) will be used for
transmitting/receiving MIDI data.
However, the following display will be shown in the [F1]
GENERAL [SF4] OTHER display.
AutoLoad Dir (Auto Load Directory)
Indicates the slot number and volume label of USB storage
device's directory used in the Auto Load function, and
indicates the path to the directory.
File mode
USB Free
Indicates the amount of currently available (unused)
memory of the connected USB storage device.
Slot, Volume Label
Indicates the slot number and volume label of USB storage
device's directory used in the File mode.
Current Dir (Current Directory)
Indicates the currently selected directory.
Master mode
Mode
Indicates the mode and program number memorized to the
currently selected Master.
ZoneSwitch
Indicates the on/off status of the Zone switch.
ZoneTCH (Zone Transmit Channel)
Indicates the MIDI transmit channel of each zone (when
the Zone Switch is set to on).
Remote Control mode
See page 83 for details.
Information Displays
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Owner's Manual