System/370 Model 195 (cont'd)
To
Display
Current
PSW
1.
Press STOP; manual light
turns
on.
2.
Set
CRT DISPLAY & TAPE OP
to
PROCESS.
3.
Read
current
PSW
(bits
0-63)
displayed on panel
H.
4. Press
START
to
resume processing.
To
Alter
Current
PSW
1.
Display
current
PSW.
2. Place CBR/CXR switch
to
the
CBR position.
3.
Set
new
information in
the
CXR/CBR (data) switches.
4. Press
SET
PSW.
The
current
PSW
is
now altered;
the
now·current
PSW
data
is
automatically displayed on panel
H.
5.
Press
START
to
resume instruction processing.
To
Stop
on
Main Storage Address
1. Press
STOP; manual light
turns
on.
2.
Set
ADDRESS COMPARE
to
(a) INSN
SOFT
STOP, (b) SCU STORAGE
SOFT
STOP,
or
(c) CHAN
S/F
SOFT
STOP.
3.
Set
ADDRESS/ADDRESS COMPARE
to
the
desired
stop
address.
4. Press
START
to
resume processing. After
the
compare
stop
has been accom·
plished,
restore switches
to
their normal settings,
then
press START.
To Clear Main Storage
Only
Under normal operating-system operation, it
is
unnecessary
to
clear main storage
because
the
operating system provides this function as required.
For
certain testing
operations,
however, it may
be
desirable
to
clear main storage.
The
following pro·
cedure clears main storage,
but
does
not
alter
the
contents
of
general
or
floating· point
registers.
1.
Press STOP; manual light
turns
on.
2.
Set STORE/DISPLAY/STG SELECT
to
MAIN
STORAGE.
3.
Set
CRT DISPLAY & TAPE OP
to
STORAGE.
4.
Set
all CXR/CBR switches
to
0
or
press CBR TO ZEROS.
5.
Set
(lever) STORAGE TEST
to
STO (up position)
on
panel L
6.
Press
START
STORAGE
TEST
on
panel L
7. Restore STORAGE TEST
to
normal,
center
position. All
of
main storage
now
contains
data
(zeros) in CXR/CB R switches.
8.
To
resume processing, re-IPL
the
control program.
To
Clear
System
1. Hold System Clear Enable switch (panel U in
the
down
position while
depressing
the
System Reset switch. This will cause (1) a normal system
reset, (2) all
of
main storage, G
RS
and.
F L RS,
and
Storage
Protect
keys
to
be
reset
to
zero, and (3)
the
data buffers
to
be
invalidated.
2. Hold
System
Clear Enable switch
in
the
down position while depressing
the
Load swi tch.
This
will cause
the
machine
to
execute
a normal system clear
and
then
the
normal load function.
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3-25
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