IBM 6151 Maintenance And Service Manual page 51

Two-Digit Display Codes During Diagnostic Programs
The following chart is for flashing (approximately one second)
numbers displayed in the two-digit display while running the
standalone diagnostic programs.
Number
Description of the Problem
02 A read error occurred while using the diskette drive.
99
A program check or a machine check occurred.
c6·xx An undetermined error occurred.
c6-20 Out of memory space.
This can be caused by one of the following things on a
system unit with 1M byte memory:
•
Diagnostic programs were ran following a utility
program.
•
Diagnostic programs ran with the "Run Multiple
Times" option selected.
•
Multiple diagnostic selections made.
To continue, insert RT PC Diagnostics 1 and press the
Ctrl-Alt-Pause keys.
(6/88) Diagnostics 2-19