A long ago tidbit:  When installing AIX on a token ring-attached 43P from a
NIM server, go into

F4 at boot-up time,
Utilities
Remote IPL Setup
Adapter Parms
Search for other Adapters
Configure Token Ring Adapter  (enter "space" here)

and insure these       are set to
----------------       ----------
I/O Address                  A20
Interrupt                      9     <-  This is often 7
RAM Address                D0000
RAM Size                     32K
ROM Address                DC000
Remote IPL              Disabled
T.R. Data Rate                16
Auto Sense              Disabled