IBM Personal Computer XT Manual To Operations page 133

Test 2200
1
Do you have an
IBM
Personal Computer Cluster
Adapter installed in your system?
NO - Continue with the next Test.
YES -
Did either of the following error
messages appear on your screen?
XX:XX:XX
ERROR-SYSTEM UNIT
22XX X
XX:XX:XX
ERROR-EXPANSION UNIT 22XX X
YES - Have the unit that contains the adapter
and the terminating plug serviced.
NO - Go to the next step.
April 1984
Test 2200-1