Section 5 The Operating System; General; Program Modules - LSI M-Three Operator's Manual

SECTION 5 THE OPERATING SYSTEM
N.B. This section is only a preliminary introduction to CP/M and is
in no way intended as a substitute for the official and more complete
CP/M manuals.
5.1 GENERAL
As previously mentioned, when an M-THREE system is switched on
it will not function until a 'system diskette' (a diskette with
Operating System software on it) is loaded into its left-hand Disk
Drive.
The Operating System on the disk is a collection of inter-related
system management programs which, when loaded, overlays the
system's dynamic RAM with a memory mapped control program.
The standard Operating System for the M-THREE range is CP/M.
This Operating System maps out the memory into the following
areas:
a) An area for each of the main system management program
modules.
b) An area reserved for system data.
c) An area reserved for user programs and data. (TPA)
5.2 PROGRAM MODULES
There are three main system management program modules within
CP/M, these are:
a) Console Command Processor (CCP)
b) Basic Disk Operating System (BOOS)
c) Basic Input/Output System (BIOS)
When an M-TH R E E has had its system diskette loaded, the CCP
module provides a message confirming that the Operating System in
use is CP/M and a 'prompt' (A>j.
5-1