Yamaha DME64N Owner's Manual page 187

DME
DMEs are arranged in the Zone window. If DME properties settings have been made for an expansion
card installed in one of the DME slots, the card will be displayed automatically.
DME24N
DME24N with no I/O card installed.
DME64N
DME64N with no I/O cards connected in slots.
DME24N with an I/O card installed in
its expansion slot.
DME64N with I/O cards installed
in expansion slots 1 and 4.
DME Designer Owner's Manual
Chapter 4 Designer
187