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Device Codes
The
01
:
in
the
filespec illustration is a device code;
there,
it
rep-
resents
the
part of your system you want
DOS
to use in carrying
out a command
.
The
0
stands
for disk
drive,
and the
1
specifies
the number of the drive
in
your
computer
system
.
The colon
(:)
must always be used with a device code
.
There are also codes
for
other devices that DOS can access or
activate.
The
default display device
,
for example
(see
"
De-
faults
,"
below) is
E:
,
which stands for your
TV
screen or
monilor;
you
could also
use
P:,
which stands for a
printer.
See
DISK
DI-
RECTORY
in
Section 4 for some examples
of using
different
display devices
.
C:
,
for cassette program recorder, is another
device
code
that you might specify
when
using
DOS,
your disk
drive,
and a program
recorder
to manage
files.
Defaults
For your
convenience
,
default responses to several
of
its own
prompts are built in to DOS
2.5.
Since most DOS users have only
one
disk
drive,
for example
,
one of
the more
convenient
defaults
in
DOS is 01
:
-
Disk Drive
1
of
your computer
system
.
You
have seen how DOS defaults
to
this device when
you
press
[
Retl.m
)
in
response to a DIRECTORY-
SEARCH
SPEC,
LIST
FILE prompt. DOS also defaults
to
01
: as
a source
and destination device
-
provided that you press
[
Retl.m
)
in
response to
the
appropriate prompts
-
when
you
are
using most
other
DOS
functions
.
If
you
have
only
one disk drive
,
you
do
not
have to specify a drive
number when entering the device
code
for it. DOS
understand
s
D: to
mean
Drive
1.
Filenames
Each
file
stored on a given diskette must have a unique
filename
;
otherwise
,
your
computer
system wOUldn't know which
file
you
wanted
to
work
with.
Filenames
may
be
up
to
eight
characters in length
,
followed if
you
like
by a period
and
an extender
of
up to
three
characters
.
20
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