IBM System/370 145 Operating Procedures Manual page 55

Store Status
• An operator-initiated function that places the program-
mable registers in ,fixed locations in processor
storage •
• The function is initiated by placing the PR-KB in alter/
display mode and typing in ST.
Store Status Procedure
1.
Press the STOP key, or place the RATE.switch in either
INSTRUCTION STEP or SINGLE CYCLE HARD STOP
position. This places the CPU in a stopped state.
2. Press the ALTER/DISPLAY key on the PR-KB. The
PROCEED light turns on.
3. Type in the mnemonic ST. The function is executed,
the carriage on the PR-KB returns, and the CPU exits
from the ALTER/DISPLAY mode and returns to a
stopped state. (No printout is given.)
The following programmable registers are affected:
CPU timer
Clock comparator
Current PSW
Floating point registers
General registers
Control registers
Note: The fixed storage location addresses for these
areas are given in
IBM System/370 Model
145
Functional
Characteristics,
GA24-3557.
54