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System/370 Model 158 (cont'd)
To Alter Registers, PSW, and Main Storage
1.
If the system is in Alter/Display mode, press CANCEL key. This will reo
initialize Alter/Display. If the system is in Program mode, (a) press STOP
key; (b) press MODE SEL to display Manual frame; select '3 AL TER/
DISPLA Y' or key in F3.
2.
Select A under FUNCTION on the ALTER/DISPLAY frame, or key in A.
3.
Select or key in the letter of the facility to be altered.
4.
Key in address and PSW.
5.
Alter data. As the data is entered, the digit appears under the old value and
the cursor is spaced forward.
6.
To store altered data, select the ENTER function by use of the light pen or
press ENTER key. If data to be altered is on the top line, the ENTER
function must be selected prior to the New Line function, otherwise the data
remains unaltered.
7.
After altering data, press MODE 5EL once to return to manual frame; twice
to return to program frame.
To Stop on Main Storage Address
1.
Press MODE SEL to display manual frame.
2.
Select 1 ANY and
5
STOP under 5-SAR COM SEL (REAL),
0'
key in 51
and S5.
3.
Key in E and address of main storage.
4.
Press ENTER key.
To Clear Main Storage
1.
Select
0·6
5YS RESET CLEAR under O-OPERATOR FUNCTIONS, or key
in. letter
0·6.
2.
Press ENTER key.
Hard Stop Option
After" hardstop:
1.
Return CHECK CONTROL to PROCESS.
2.
Select SERVICE frame.
3.
Select INDEX frame.
4.
Select EXTERNAL DIAGNOSTIC frame.
5.
Be sure UN" diskette is inserted in IGAR2.
6.
Load "N" disk.
7.
PROGRAM frame will be displayed after UN" disk load. Make entries per
Questions asked.
8.
Save the results for the CEo
In hardstop mode, the CPU clocks are stopped by any error that causes a machine
trap. If CE advises running in hard stoP mode, start the clocks. This will cause the
system to run as if
it
were in PROCESS mode.
Page 3-14
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