IBM System/370 145 Operating Procedures Manual page 47

5
Exceptions:
Note 1: I f the system has been powered on without
the *370 microprogram disk inserted in the 'console
file, the following procedure must be performed
before using the system.
a. Insert the *370 microprogram disk in the console
file.
b.Press the START CONSOLE FI LE key.
c.After I MPL is complete, perform a clear storage,
operation as follows:
1. Press and hold ENABLE SYSTEM CLEAR key.
2. Press the SYSTEM RESET or the LOAD key.
All of main storage is cleared to zeros (hexa-
decimal 00); control storage is not affected.
Note 2: Microprogram Patch Procedure
1. After PR-KB prints GO-NO-GO message, it
may print microprogram patch-card IPL
procedure.
2. If required, follow microprogram patch-card
procedure before you IPL the SYS RES device.
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