Introduction - IBM System/370 145 Operating Procedures Manual

INTRODUCTION
This is a graphic operating procedures manual. It contains
only information necessary to operate the System/370
Model 145 Processing Unit and integrated devices.
Order number for manuals containing operating pro-
cedures for individual input/output devices can be found
in the IBM System/360 Bibliography, GA22-6822.
This manual covers information required by the operator
for normal system operation. An effort was made to el imi-
nate unnecessary information. Controls and indicators used
only by service personnel are not described in this manual
but are covered in maintenance documentation for the sys-
tem.
System/370 Model 145 performs data manipulations and
input/output operations by executing microprogram rou-
tines. The routines executed are determined by the machine
language instruction being processed. The I nitial Micropro-
gram Program Load (I MPL) disk contains the microprogram
and is inserted into the Console File before power is applied
to the system.
When power is applied to the system, the microprogram is
loaded into control storage and the system is ready to load
the operating system (OS, DOS, etc.) or a standalone pro-
gram. These programs are loaded by using the I nitial Pro-
gram Load (I PL) procedure in this manual.
Operating procedures that are necessary before a problem
program can be run are:
1.
Disk Cartridge I nsertion (I M P L disk)
2. Power-on
3. I MPL (automatic with power-on)
4. I PL the operating system (if required)
Whenever power is removed from the system these proce-
dures must be followed. When power is dropped, both con-
trol storage and main storage are invalid.
A visual contents is provided to aid in quickly locating
controls and indicators on the system control panel.
To evaluate the approach used in this manual, you are
encouraged to use the Reader's Comment Form in the back
of the manual. Your comments will help to provide better
documentation in future manuals.
Introduction 7