IBM System/370 145 Operating Procedures Manual page 51

Alter/Display Procedures
Note: Steps 1 to 3 are common for alter and display
operations.
1
Press the STOP key or set the RATE switch to either
INSTRUCT/ON STEP or SINGLE CYCLE HARD STOP.
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Press the ALTER/DISPLAY key.
Wait for both ALTER/DISPLAY MODE and PROCEEO
indicators to turn on.
RATE
INSTRUCTlO@©jPROCESSSINGLECYCLE
STEP HARD STOP
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CONSOLE FILE
BYTE COUNT
HARD STOP