IBM RT PC Problem Determination Manual page 37

Step 2. Di agnosti cs
D iagnostic D isk ette Handling P rocedures
The IBM RT PC Diagnostic Diskettes contain the diagnostic
programs used to check out and test the system. Diagnostics 1
(DIAG-1) is the first diskette used. After the diagnostics are
loaded, the system may prompt for another diskette to be inserted
into a diskette drive.
CONTINUE to next page.
Section 2. Hardware Problems 2-9