IBM 5155 Manual To Operations page 135

This is an information page that explains the
Cluster status that may appear on your screen.
NN is any station address from 0 to 63.
The system you are using is
indicated on the screen in blinking
reverse video, and the box is
marked by two asterisks.
Stations that have the Power
switch set to On are displayed in
reverse video, and their boxes are
marked by two X's.
If another Personal Computer has
the same station address as your
Personal Computer, a long beep
will sound every 3 seconds, the
box will be displayed in blinking
reverse video and marked by an X
and an asterisk.
A station address not in the
Cluster is indicated by a box
displayed in normal video and not
marked with X's or asterisks.
A Cluster Access Error message
may be displayed in reverse video.
Go to next step.
January 1984 Test 2200-7