IBM 5155 Manual To Operations page 137

8
Did a box marked in blinking reverse video with
an X and an asterisk appear, and did a beep
sound every 3 seconds?
YES -
Another Personal Computer has the
same station address as your Personal
Computer. Use your Cluster map and
compare it with the status screen
presentation. Run the system diagnostic
tests on the Personal Computer that is
missing from the Cluster Status screen.
Have the unit that contains the failing
adapter serviced.
NO - Go to the next step.
January 1984
Test 2200-9