IBM 5155 Manual To Operations page 127

Test 2000
Do you have an ffiM Binary Synchronous
Communications Adapter installed in your system?
NO - Continue with the next Test.
YES - Did any of the following error messages appear
on your screen?
XX:XX:XX
ERROR ­ SYSTEM UNIT
20XX
XX:XX:XX
ERROR ­ SYSTEM UNIT
21XX
XX:XX:XX
ERROR EXPANSION UNIT
20XX
XX:XX:XX
ERROR EXPANSION UNIT 21XX
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 2000-1