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APPENDIXF
HOW TO SPEED UP
DATA
TRANSFERS
TO DISK DRIVE
000000000000000000
DOS 2.5 has the ability to Write with
Read
Verify,
a safety
tech·
nique that should be used whenever
improved reliability
is
more
important than rapid data
transmissions.
This is the
way
your
DOS 2.5 Master
Diskette is
shipped to you
.
To
save time
,
how-
ever,
the information can be written to the
diskette
without a
Read
Verify.
Memory
Location 1913 (decimal) contains the data
that determines whether
the
File Management Subsystem will
use Write with
Read
Verify (57
hex,
87 decimal) or Write
witho
ut
Read Verify (50
hex,
80
decimal). Write without Read Verify is of
course
faster,
but may not
be as reliable. To customize your ver-
sion of
DOS
2.5
from
BASIC
,
you
need
to
POKE
1'~13,80
for
fast
Write (Write without
Read
Verify).
If you would
rather
have
the
Write with Read
Verify,
POKE
1':n3~
87
To
alter
the
version of DOS stored on
diskette
so
that
your cus-
tom version will always boot
in
,
simply
type
DOS
and
then
use an
H
command (WRITE
DOS FILES)
from the
DOS Menu to
store
the new version of
DOS
from
RAM
onto your
diskette.
(See also Appendix
L,
the
SETUP
COM section
,
for
how
you can
do
this
with
the
"
Change
System Configuration
"
option .)
Caution:
POKEing
location
1913
with any values other than 80 or
87
will cause loss of
data
,
a destroyed
diskette,
and
probably a
system lock-up as well.
105
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