8-Port Asynchronous Mil-Std 188 Adapter - IBM RT User's Setup Manual

8-Port Asynchronous MIL-STD 188 Adapter

With the 8-Port Asynchronous MIL-STD 188 Adapter you can
connect a system unit or 6192 Expansion Unit - Model 001 to
printers, plotters, terminals, or modems located up to 15.2 m (50 ft)
from the system unit.
Address Selection Interrupt Level Selection
(Switch 1) (Switch Bank 2)
AJZIF209
Section 6. Communication and Network Adapter Options 6-37