IBM System/370 Operator's Reference Manual page 56

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System/370 Model 165 (cont'd)
To Clear Main Storage (Clear Storage)
1.
Hold SYSTEM CLEAR; press SYSTEM RESET.
2.
Release SYSTEM CLEAR; manual light turns on.
3.
Perform I PL.
Hard Stop Option
If both wait and system lights are off, possible hardstop may be assumed. If no special
procedures are provided by service personnel, follow procedures in Hardstop option,
listed below.
1.
Set MACHINE CHECK to STOP ON CHK.
2.
At stop, press STOP, CHECK RESET, and START.
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