IBM RT User's Setup Manual page 96

and Printer Adapter) have two lines for recording device
names.
If the IBM RT PC Expansion Unit Adapter is used, record it
under the Name column as you would any other adapter. In
the Devices column, record "IBM RT PC 6192 Expansion
Unit," and then record the adapters and devices that relate
to the 6192 Expansion Unit.
Disregard the extra lines on the form if the adapter has only
one or two ports.
• Record only the devices you connect. Depending on your
system, you might not write in all the spaces. Do not record
where you connect the keyboard and mouse.
4. The ID column under Adapters is provided to distinguish
between adapters of the same type. You will complete this part
of the cabling record when you test the system in Section 3.
A-2 User Setup Guide