Chapter 2
Command Setup and
Execution Under CP
1M
-86
This chapter discusses the operation
of
the Console
Command
Processor, the
format
of
transient programs,
CP/M-86
memory models,
and
memory image
formats.
CCP
BUILT-IN
AND
TRANSIENT COMMANDS
The
operation
of
the
CP/M-86
Console
Command
Processor (CCP)
is
similar
to
that
of
CP/M-80's
CCP.
At
initial cold start, it prints the
CP/M
sign-on message,
automatically logs in Drive A,
and
issues the
standard
prompt
at
the console.
CP
/M-86
then waits for input
command
lines from the console.
The
command
line may include one
of
the built-in commands:
DIR,
ERA, REN,
TYPE,
or
USER. (Note
that
SAVE
is
not supported
under
CP/M-86
since the
equivalent function
is
performed by DDT-86.) See the CPIM-86 User's Guide for
the APC for more information
about
these programs.
The
command
line may also begin with the name
of
a transient program with the
assumed file type
CMD,
denoting a commandfile. The
CMD
file type differentiates
transient
command
files used
under
CP/M-86
from
COM
files, which operate
under
CP
/M-80.
The
CCP
allows multiple programs to reside in memory, providing facilities for
background tasks. A transient program may load additional programs for execu-
tion under its own control.
2-1
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