IBM System/370 Manual page 120

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The latter insures the continuation of system operations whenever
possible if the error cannot be corrected. This is particularly
important during online operations. In Model 165 systems without
RMS. hardware errors other than single-bit processor storage errors
will necessitate a re-IPL.
• The diagnosis of machine malfunctions
by
customer engineers will
be helped
by
status information recorded by RMS. This data will
be of greatest benefit in diagnosing intermittent errors.
• Versions of OS control programs that include Model 165 RMS routines
are the only ones that include support of new Model 165 features,
channels. direct access devices. integrated emulators. and the
graphic operator console.