IBM RT PC 10 Hardware Maintenance And Service page 279

Switch Settings
Use the diagram below to set the switches on your adapter.
Note: Only one asynchronous adapter can use an address range. Each
asynchronous adapter can be set to any of the four address ranges.
9-24 Service Manual
Switch
Bank 1
Interrupt
Level
9
10
11
Switch Bank 2
Address Range
12 J 4 5 6 7 !
2 :,]~~~~~~~
12 J 4 5 6 7 !
3 :,]~~~~~~~
12 J 4 5 6 7 !
4 :,]~~~~~~~
o
2
Four
r1
6-Pin
D
3
Connectors