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.
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