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processing O
via O
( + O
) O
( O
and O
also O
with O
( + O
) O
/ O
, O
when O
the O
default O
file O
extension O
has O
been O
changed O
with O
SYS O
/DR:ext O
) O
, O
the O
user O
is O
prompted O
to O
enter O
a O
valid O
shell O
file O
name O
before O
trying O
to O
load O
COMMAND.COM B-Operating_System
from O
the O
root O
. O
Depending O
on O
the O
version O
, O
the O
size O
of O
the O
CONFIG.SYS O
file O
is O
limited O
to O
a O
few O
kilobytes O
under O
MS-DOS/PCDOS O
( O
up O
to O
64KB O
in O
most O
recent O
versions O
) O
, O
whereas O
the O
file O
's O
size O
is O
unlimited O
under O
DR-DOS O
. O
This O
is O
because O
the O
former O
operating B-General_Concept
systems I-General_Concept
( O
since O
DOS B-Device
3.0 O
) O
will O
compile O
the O
file O