IBM System/370 145 Operating Procedures Manual page 61

4
Set data switches A and B to the desired byte
match value.
5
Set the ADDRESS COMPARE CONTROL toggle
switch to STOP.
6
Press the START
k~y.
60
When a store operation modifies the specified storage
byte location to the value set in switches A and B, the
ADR COMP MATCH indicator turns on and the CPU
enters a soft-stop state.
To determine the address of the instruction in opera-
tion, display the current PSW (refer to "'Console PR-KB
Manual Operations," page 48) and subtract the current
instruction length code from the instruction address in
the current PSW.
Note: The instruction found with this procedure may
not have modified the (:lata. An I/O data trap occurring
during execution of this instruction could have modified
the data.
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