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System/370
Model 158
Source: GC38-(}{)25 Systeml310Model 158 Operating Procedures
Powar.()n Procedure
DANGER: Before switching on power, ensure that no person is exposed
to
risk and
that all equipment covers are shut.
1.
Insert the IMPL diskette in the console file. Carefully close cover.
2.
Press the POWER ON pushbutton. This button lights red, then white upon
completion of the power·on sequence. An IMPL is automatically initiated.
Powa-.()ff Procedure
1.
Preparatory to turning power off:
a.
Unload all disk and
tape
drives.
b.
Open or disengage the print release lever on all printers that
use
print
train cartridges.
2.
Press the POWER OFF pushbutton to initiate the power-off sequence. The
contents of rnain storage are not preserved.
To IMPL
1.
Press IMPL pushbutton. This causes the initial microprogram load of the
display console and CPU reloadable control stores to occur. During I!VIPL,
the message 'IMPL IN PROCESS' is displayed.
2.
On completion of IMPL the configuration frame appears. The system is
IMPLed in display mode. If PR-KB mode is desired, or timer options, select
them on this frame.
3.
Exit from the configuration frame by selecting MANUAL with the light pen
or
by pressing MODE SE L on the keyboard.
To IPL
1.
Enter load unit address and select 4 under O-OPERATOR FUNCTIONS or
key
in letter 0 and 4, followed by letter "L" and J.digit address.
2.
Select X-EXECUTE OPERATOR FUNCTION or key in X. Upon completion
of a successful I PL the program frame appears.
3.
Respond to system messages that appear on the screen.
4.
Set time and date.
Loading a Secondary Nucleus (OS)
Follow the procedure shown for the Mod 155, using either the PR-KB or the light
pen.
To Display Registers, PSW, and Main Storage
1.
Press STOP key.
2.
Press MODE SEL to display manual frame.
3.
Select '3 ALTER/DISPLAY' under FRAME CONTROL or key in F3.
4.
Select D under FUNCTION on the ALTER/DISPLAY frame, or key in D.
5.
Select
or
key in the letter of the facility to
be
displayed.
6.
Key in address-·none necessary for general registers and PSW.
7.
Press ENTER. The contents of the facility selected wiU
be
displayed in the
center of the screen.
Page 3-13
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