Cp/M+.Sys; Ccp.com - Commodore 128 System Manual

NOTE:
Although CP/M can be used with a 40-column monitor,
the display is 80 column but with only 40 columns displayed at
one time. To view all 80 columns of the display, you must scroll
the screen horizontally by pressing the CONTROL key and the
appropriate cursor key (left or right).

CP/M+.SYS

This is the main CP/M Plus system file. It contains all parts of the
system that remain permanently resident in memory: the Basic
Input/O utput System (BIOS) which loads into the top of memory,
the Basic Disk Operating System which loads into memory
immediately below the BIOS, and the System Parameters which
load into the bottom page of memory.

CCP.COM

On booting CP/M the Console Command Processor is loaded
into memory immediately below the BDOS. The remaining
memory, below CCP and above page 0, is known as the
Transient Program Area and is where applications are loaded to.
CCP is the program which processes any input (usually entered
from the keyboard) in response to the system prompt (A>). It
contains the 6 built-in commands (listed in Table 14.1 on page
14-4), and also supports the 14 console editing commands (listed
in Table 13.1).
Any word entered in response to the system prompt which is not
one of the built-in commands is treated by CCP as a transient
command, so CCP attempts to find and execute a file named as
that word with the .COM extension. If it does not find such a file
on the currently logged disk, it displays the word followed by a
question mark then brings back the system prompt.
If more than one word is entered in response to the system
prompt, all words after the first are treated as parameters to be
passed to the transient command.
A language or applications program is loaded and run by invoking
it as if it was a command. All CP/M programs include a .COM file.
11-4