Epson Y16499100301 - Manual (Page 68)

If you press Enter when a command line has an error in it,
you see this message:
Bad command or file name
Then MS-DOS re-displays the command prompt so you can
try again. Just type the correct command line and press
Enter.
Storing Data
All your work and programs are stored in files on your
diskettes or hard disk. Each file must have a unique filename
so you can retrieve it when you need to. The filename consists
of two parts: the name and the extension.
You can choose a name up to eight characters long
indicating what the file contains. The name can contain any
characters or numbers except for the following:
The extension is optional and can be up to three characters
long. It describes what type of file it is, such as a text file or
program file. When you use an extension, separate it from the
file name with a period. For example, an MS-DOS filename
might look like this:
D A T A . T X T
Sometimes you have to further identify your files by telling
MS-DOS on which drive the file is stored. To do this, you
type the letter-A, B, or C-of the disk drive where the file is
located, followed by a colon, and then the filename. For
example:
B : D A T A . T X T
You can type the drive identifier and filename in upper- or
lowercase letters. MS-DOS does not differentiate between the
two, but converts everything to uppercase letters.
MS-DOS stores your files in directories. A directory
contains specific information about each file stored there, such
4-4 Using MS-DOS With the Equity LT