1500
HD
Laptop Computer
than three characters, MS-DOS uses only the first
three.
If
you include an extension in a filename, you must
use that extension whenever you specify the file.
Note: Some programs automatically assign an ex-
tension
to
your filename.
Examples of valid filenames are:
mydatal SAMPLE
1
.TST
$1
OOGIFT
records.art 'HELP'.fil
xxx.xx
File#
1 .txt
1
OY&ALES par@64.gam
PROGl
.BAS
Check.bal
PROG2.bas myprog.sor
Examples of invalid filenames are:
his*
hers-The asterisk is not a valid character for
filenames.
.DATA-The period is valid in a filename only when
separating the filename from its extension.
regionsales-Filenames have a maximum of eight
characters. MS-DOS uses only the first eight char-
acters of the filename (regionsa).
COST+ INT-The plus symbol is not a valid char-
acter for filenames.
CON.dat-CON is a word reserved by MS-DOS.
MORE
ABOUT
MS-DOS
COMMANDS AND
KEYS
The MS-DOS operating system includes both in-
ternal and external commands.
MS-DOS
stores its
internal commands in memory when you startup
your computer. Internal commands remain in
memory at all times. These commands execute im-
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