IBM 5155 Manual To Operations page 121

Test 1500
Do you have an IDM Synchronous Data Link Control
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 15XX
XX:XX:XX
ERROR EXPANSION UNIT 15XX
YES -
Have the unit that contains the adapter
serviced.
NO - Your system has completed this test
successfully. Continue with the next Test.
January
1984
Test 1500-1