Naming A File; File Specification; Drive Specifier; Filename - Commodore 128 System Manual

NAMING A FILE

File Specification

CP/M identifies every file by a unique file specification. A file
specification can have four parts: a drive specifier, a filename, a
filetype, and a password. The only mandatory part is the

filename.

Drive Specifier

The drive specifier is a single letter (A-P) followed by a colon.
Each disk drive in your system is assigned a letter. When you
include a drive specifier as part of the file specification, you are
telling CP/M to look for the file on the disk currently in the
specified drive. For example, if you enter:
B:MYFILE
CP/M looks in drive B for the file MYFILE. If you omit the drive
specifier, CP/M 3.0 looks for the file in the default drive (usually
A).
Filename
A filename can be from one to eight characters long, such as:
MYFILE
A file specification can consist simply of a filename. When you
make up a filename, try to let the name tell you something about
what the file contains. For example, if you have a list of customer
names for your business, you could name the file:
CUSTOMER
so that the name gives you some idea of what is in the file.

Filetype

To help you identify files belonging to the same category, CP/M
allows you to add an optional one- to three- character extension,
called a filetype, to the filename. When you add a filetype to the
filename, separate the filetype from the filename with a period.
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