As noted in Section 11, a CP/M 3.0 command line consists of a
command keyword, an optional command tail, and a RETURN
keystroke. This section describes the two kinds of commands the
command keyword can identify, and summarizes individual
commands and their functions. The section also gives examples
of the use of some of the more commonly used commands, ln
addition, the section explains the concept of logical and physical
devices under CP/M 3.0. This section then tells how CP/M 3.0
searches for a program file on a disk, tells how to execute
multiple commands, and how to reset the disk system. Finally, the
section explains how to use the HELP command to get
information on various CP/M topics including command formats
and usage, right at the keyboard.
THE TWO TYPES OF CP/M 3.0 COMMANDS
There are two types of commands on CP/M 3.0:
• Built-in commands — which identify programs in memory
• Transient utility commands — which identify program
files on a disk
CP/M 3.0 has six built-in commands and over 20 transient utility
commands. You can add utilities to your system by purchasing
various CP/M 3.0-compatible application programs. If you are an
experienced programmer, you can also write your own utilities
that operate with CP/M 3.0.
BUILT-IN COMMANDS
Built-in commands are part of CP/M 3.0 that are always available
for your use, regardless of which disk you have in which drive.
Built-in commands are entered in the computer’s memory when
CP/M 3.0 is loaded, and are, therefore, executed more quickly
than the transient utilities. Table 14-1 lists the Commodore 128
CP/M 3.0 built-in commands.
Some built-in commands have options that require support from a
related transient utility. The related transient utility command has
the same name as the built-in command and has a filetype of
COM.
14-3
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