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These are the
files
that make up the DOS
2.5
program
.
The
three·digit numbers in the right·hand column indicate how many
sectors
each file occupies on the Master
Diskette
.
(See
" Format-
ting a Diskette
"
for an explanation of
sectors.)
The
line below
the
index tells you how
many
sectors remain for storing
additional
information on the
diskette.
DOS.SYS and
DUPSYS
are the tiles that execute
the
standard
DOS functions
.
For
an explanation of
RAM
DISK
.
COM
,
see Ap-
pendix
K.
Explanation
s
of SETUPCOM
,
cOPY32 .COM
,
and
DISKFIX.COM appear in Appendix
L.
Duplicating a Diskette
With
the DUPLICATE
DISK option on the
DOS
2.5
Menu
,
you can
create an exact replica at a
diskette.
This
function copies every-
thing from your original
,
or
source,
diskette
onto
another,
or
desti-
nation
,
diskette. It also formats your destination
diskette.
Caution:
The
DUPLICATE DISK
function erases or writes over
any
information
that
may
already be
on
a
destination
diskette.
Never
use a destination
diskette
that contains valuable files
.
To Duplicate Your DOS Diskette
To learn how the
DUPLICATE function
works
,
make a duplicate
of your DOS
2.5
Master Diskette. This is also an important safe-
guard
.
You should use your
duplicate
as your worki ng copy of
DOS
,
and
keep
the Master Diskette
itself
as a backup copy. Then
you can use
DOS
without worrying about accidental
damage
to
your working diskette.
As your destination
diskette,
use
a
new,
blank
diskette.
If You Have One Disk Drive
1.
With
the
DOS
Menu
on your
screen,
type
J
and
press
I
FIetu'n
].
The prompt
DUP
DISK-SOURCE,
DEST DRIVES?
appears.
2.
Type
1,1
and
press
[
Fletu'n l.
The
prompt-INSERT
SOU
RCE
DISK
,
TYPE
RETURN
appears
.
14
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