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. O
A O
DOS B-Device
system O
would O
require O
troubleshooting O
if O
either O
of O
these O
files O
became O
damaged O
or O
corrupted O
. O
If O
CONFIG.SYS O
does O
not O
contain O
a O
SHELL O
directive O
( O
or O
the O
file O
is O
corrupt O
or O
missing O
) O
, O
DOS B-Device
typically O
searches O
for O
COMMAND.COM B-Operating_System
in O
the O
root B-Application
directory I-Application
of O
the O
boot O
drive O
. O
If O
this O
is O
not O
found O
, O
versions O
of O
DOS B-Device
before O
6.0 O
will O
not O
start O
up O
. O
MS-DOS O
6.0/PCDOS O
6.1 O
and O
Novell O
DOS B-Device
7 O
and O
higher O
will O
instead O
display O
a O
prompt O
to O
enter O
the O
path O
and O
filename O
of O
a O
command O
processor O
. O
( O
In O
the O
case O
of O
COMMAND.COM B-Operating_System
, O
the O
internal O
EXIT O