IBM System/370 Operator's Reference Manual page 61

System/370 Model 195
Source: A22-6954 Systeml360 and Systeml370 Model 195
Operating Procedures
Power-On Procedure
DANGER: Before turning on the system, ensure that no person is exposed to risk and
check all peripheral units externally. Check that doors are properly closed, feeds not
impeded, and paper and card supplies suitable to permit power-on sequencing.
1.
Check panel light coolant check or coolant water temperature gage for
normal setting before power-on sequence.
2. Press POWER ON (operator control panel); the backlighted key should turn
red immediately.
3. At the completion of normal power-on sequence (a matter of seconds), the
POWER ON backlight turns white. If, after 90 seconds, POWER ON does
not light, check to see whether EMERGENCY PULL has been pulled.
Power-Off Procedure
Before performing the turn-off procedures, issue WRITELOG and HALT commands (if
using operating system). If manual light is not turned on, press STOP; manual light
turns on. Perform ''Two-Channel Switch Proc;roures" if applicable.
1. Check all tape units. Put them in unload state by pressing RESET and
LOAD REWIND. After REWIND is completed, press UNLOAD on each tape
unit and press RESET to shut power window.
2. Check all disk drives. Put them in unload state by switching to STOP on
each disk drive if drives are running. (Disk drives must be individually turne<:'
off before power is turned off.)
3. Press POWER OFF. Power is sequenced down automatically. The power-)n
light turns off.
4. Continue power-off procedures for peripheral equipment not connected to
the power-off sequence.
Manual IPL
Manual IPL is performed after a power-on sequence, after malfunctions that .1ecessitate
reloading the resident portion of the operating system (control program) into main
storage, as part of switching from one operating system to another, or for initial load·
ing of any stand-alone program.
1. Place the program on the desired I/O device and ready that device. (Check
that CRT DISPLAY & TAPE OP is at process. Check that
lest
light is off,
unless a critical switch has been deliberately set to other tban nonmal posi-
tion.)
2. Set the three LOAD UNIT switches to the I/O address required.
3. If the installation does not use the secondary nucleus, go to step 4. If the
secondary nucleus is used, follow procedure in "Loa:ling the Secondary
Nucleus" as direct replacement for step 4.
4.
Press
LOAD. The load light
tlJr~s
on,
the
ma"u2!
Hght'
tvrll~
off, and
o:;v~tern
reset
occu~.
When the loader portion of the prograrr is in main storage, the
load light turns off and control of the system is passed to the channel,
which directs the storage of the remainder of the program.
5. If this is a stand-alone program (independent utility: DASDI, DUMPI
RESTORE, or RECOVER/REPLACE), and it is loaded properly, the wait
light turns on. The IC reads FFCO. Type, for example, INPUT=2400 181
(where 2400 is the magnetic tape device type, and 181 is its hex address).
Hold down ALTN CODE key and 'press numHic 5 key. When the job is
completed, the program prints out END OF JOB and
ente~
the wait state.
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