System/370 Model 135 (cont'd)
4.
After
contents
are displayed, press END
at
console-printer keyboard.
5.
To
resume operations, press START.
To
Alter Registers, PSW,
and
Main
Storage
1.
Press STOP and
wait
until
MAN
indicator comes on.
2.
Press
ALTER/DISPLAY
at
console-printer keybOard
and
wait
until
the
PROCEED light comes on.
3. Select a 2-character mnemonic
(A
plus
appropriate
second letter) from
the
Alter/Display Mnemonics chart,
and
type
the
mnemonic
and
hex address.
4.
Enter
new
characters in positions occupied
by
characters
to
be
replaced.
Reach required positions
by
repeating characters. In
the
case
of
the
current
PSW,
retype
up
to
and
including
the
new bits desired,
and
press RETURN.
It
is
unnecessary
to
retype
the
remaining bits.
5.
Press
EN
D
at
console-printer keyboard.
6.
Press
START
to
resume operations.
To
Stop
on
Main Storage Address
1.
Press STOP.
2.
Set
STORAGE
SELECT
to
MAIN STORAGE.
3.
Set
INTERVAL TIMER switch
to
DISABLE (if requ;red).
4.
Set
STORAGE ADDRESS rotary switches A
through
E
to
desired address.
5.
Set
COMPARE ADDRESS
to
ANY.
6. Set appropriate ADDRESS COMPARE CONTROL switch
to
STOP.
7. Press START.
To
resume normal prooessing
after
CPU
stops
at
the
desired address:
1.
Set
ADDRESS COMPARE
to
ANY,
ADDRESS COMPARE CONTROL
to
SYNC/NORMAL,
NORMAL INTERVAL TIMER
to
NORMAL (if required).
2. Press START.
To
Clear Main Storage
The
need
for
this procedure
is
indicated
by
a message
at
the
console-printer keyboard
or
by
an unexplained CPU wait
state
(WAIT indicator on).
1.
Press
and
hold in ENABLE SYSTEM CLEAR.
2.
Press SYSTEM RESET (once only).
3. Release ENABLE SYSTEM CLEAR.
4. Perform IPL procedure.
5.
Continue
normal processing.
Hard
Stop
Option
1.
The
hardstop indicator (white light) comes
on
whenever
the
CPU stops. CPU
hardware errors are recorded in a logout area
of
main storage
by
the
CPU. If
the
software does
not
create
an
Environmental Data Recording
Set
(ERDS),
run
the
SEREP
(stand·alone) program
to
obtain
a
printout
of
the
latest
error
information. Keep
the
EREP
or
SEREP
printouts
because
they
are useful
to
the
CEo
2. On advice
of
the
CE
you
may
then
set
the
CHECK CONTROL switch
to
CONDITIONAL HARD STOP
and
operate
the
CPU.
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