Introduction - IBM System/370 145 Operating Procedures Manual

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System/370 Model 145 Data Processing System
This manual contains information necessary to operate the
System/370 Model 145 Processing Unit and integrated
devices, except the I FA. Order numbers for manuals
containing operating procedures for individual input/
output devices can be found in the
IBM System/360 and
System/370 Bibliography,
GA22-6822. Controls and
indicators used only by service personnel are covered
in maintenance documentation for the system.
System/370 Model 145 performs data manipulations
and input/output operations by executing microprogram
routines. The routines executed are determined by the
machine language instruction being processed. The Initial
Microprogram Load (IMPL) disk contains the 370 micro-
program and is inserted into the Console File (CF) before
power is applied to the system.
When power is applied to the system and the 370 micro-
program is loaded into control storage, the system is ready
to load the operating system (OS, DOS, etc.) or a stand-
alone program. These_programs are loaded by using the
INTRODUCTION
Initial Program Load (IPL) procedure in this manual.
Operating procedures necessary before a problem
program can be run are:
1. Disk Cartridge Insertion (lMPL disk)
2. Power-on
3. IMPL (automatic with power-on)
4. IPL the operating system (if required).
Whenever power has been removed from the system,
these four procedures must be followed. When power
is dropped, the contents of control storage and main
storage are invalid.
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Introduction 7
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