<s>
PTS-DOS	B-Operating_System
(	O
aka	O
PTS/DOS	B-Operating_System
)	O
is	O
a	O
disk	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
a	O
DOS	B-Device
clone	O
,	O
developed	O
in	O
Russia	O
by	O
PhysTechSoft	O
and	O
Paragon	O
Technology	O
Systems	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
1993	O
,	O
PhysTechSoft	O
released	O
the	O
first	O
commercially	O
available	O
PTS-DOS	B-Operating_System
as	O
PTS-DOSv6.4	O
.	O
</s>
<s>
The	O
version	O
numbering	O
followed	O
MS-DOS	B-Application
version	O
numbers	O
,	O
as	O
Microsoft	O
released	O
MS-DOS	B-Application
6.2	O
in	O
November	O
1993	O
.	O
</s>
<s>
They	O
took	O
source	O
code	O
with	O
them	O
and	O
released	O
their	O
own	O
version	O
named	O
PTS/DOS6.51CD	O
as	O
well	O
as	O
S/DOS	B-Operating_System
1.0	O
(	O
"	O
Source	O
DOS	B-Device
"	O
)	O
,	O
a	O
stripped	O
down	O
open-source	O
version	O
.	O
</s>
<s>
According	O
to	O
official	O
PhysTechSoft	O
announcements	O
,	O
these	O
programmers	O
violated	O
both	O
copyright	O
laws	O
and	O
Russian	O
military	O
laws	O
,	O
as	O
PTS-DOS	B-Operating_System
was	O
developed	O
in	O
close	O
relationship	O
with	O
Russia	O
's	O
military	O
and	O
thus	O
may	O
be	O
subject	O
to	O
military	O
secrets	O
law	O
.	O
</s>
<s>
PhysTechSoft	O
continued	O
development	O
on	O
their	O
own	O
and	O
released	O
PTS-DOS	B-Operating_System
v6.6	O
somewhere	O
between	O
and	O
presented	O
PTS-DOSv6.65	O
at	O
the	O
CeBIT	O
exhibition	O
in	O
1997	O
.	O
</s>
<s>
The	O
next	O
version	O
from	O
PhysTechSoft	O
,	O
formally	O
PTS/DOS	B-Operating_System
Extended	O
Version	O
6.70	O
was	O
labeled	O
PTS-DOS	B-Operating_System
2000	I-Operating_System
and	O
is	O
still	O
being	O
distributed	O
as	O
a	O
last	O
16-bit	O
PTS-DOS	B-Operating_System
system	O
,	O
.	O
</s>
<s>
Paragon	O
continued	O
their	O
PTS-DOS	B-Operating_System
line	O
and	O
released	O
Paragon	B-Operating_System
DOS	I-Operating_System
Pro	I-Operating_System
2000	I-Operating_System
(	O
also	O
known	O
and	O
labeled	O
in	O
some	O
places	O
as	O
PTS/DOS	B-Operating_System
Pro	O
2000	O
)	O
.	O
</s>
<s>
Moreover	O
,	O
this	O
release	O
contained	O
bundled	O
source	O
code	O
of	O
older	O
PTS-DOS	B-Operating_System
v6.51	O
.	O
</s>
<s>
Later	O
,	O
PhysTechSoft	O
continued	O
developing	O
PTS-DOS	B-Operating_System
and	O
finally	O
released	O
PTS-DOS	B-Operating_System
32	O
,	O
formally	O
known	O
as	O
PTS-DOS	B-Operating_System
v7.0	O
,	O
which	O
added	O
support	O
for	B-Language
the	O
FAT32	B-Application
file	B-Application
system	I-Application
.	O
</s>
<s>
PTS-DOS	B-Operating_System
is	O
certified	O
by	O
the	O
Russian	O
Ministry	O
of	O
Defense	O
.	O
</s>
<s>
The	O
following	O
list	O
of	O
commands	B-Application
are	O
supported	O
by	O
PTS-DOS	B-Operating_System
2000	I-Operating_System
Pro	I-Operating_System
.	O
</s>
<s>
This	O
command	B-Operating_System
is	O
specific	O
to	O
PTS/DOS	B-Operating_System
2000	O
.	O
</s>
<s>
Purpose	O
:	O
Restores	O
the	O
booting	O
of	O
a	O
system	O
installed	O
before	O
PTS-DOS	B-Operating_System
on	O
the	O
disk	O
and	O
restores	O
its	O
the	O
boot	O
sector	O
.	O
</s>
