IBM Personal Computer Manual To Operations page 168

9
Did a box appear in normal video with no Xs or
asterisks, for a station address that is in the
cluster?
Note: Multiple grounds on cluster cables
may cause stations to appear on the status
screen presentation intermittently. If this
happens, notify your installation manager.
NN
YES-
Go to Step 11.
NO -
Go to the next step.
2200-10 Test
April 1984