<s>
MNOS	B-Operating_System
(	O
MobilNaya	O
Operatsionnaya	O
Sistema	O
,	O
МобильНая	O
Операционная	O
Система	O
( МНОС	O
)	O
,	O
or	O
Portable	O
Operating	B-General_Concept
System	I-General_Concept
)	O
is	O
a	O
Unix-like	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
developed	O
in	O
the	O
Soviet	O
Union	O
.	O
</s>
<s>
The	O
system	O
is	O
derived	O
from	O
Version	B-Operating_System
6	I-Operating_System
Unix	I-Operating_System
and	O
then	O
modified	O
to	O
incorporate	O
features	O
of	O
Berkeley	B-Operating_System
Software	I-Operating_System
Distribution	I-Operating_System
(	O
BSD	B-Operating_System
)	O
Unix	O
.	O
</s>
<s>
From	O
1983	O
until	O
1986	O
,	O
it	O
enjoyed	O
popularity	O
in	O
the	O
Soviet	O
Union	O
and	O
other	O
Eastern	O
Bloc	O
countries	O
,	O
due	O
to	O
its	O
small	O
size	O
and	O
faster	O
performance	O
than	O
that	O
of	O
other	O
Version	B-Operating_System
7	I-Operating_System
Unix	I-Operating_System
(	O
and	O
later	O
BSD	O
Unix-based	O
)	O
alternatives	O
.	O
</s>
<s>
MNOS	B-Operating_System
and	O
its	O
alternative	O
,	O
DEMOS	B-Language
version	O
1.x	O
,	O
were	O
gradually	O
merged	O
from	O
1986	O
until	O
1990	O
resulting	O
in	O
the	O
joint	O
OS	O
,	O
DEMOS	B-Language
version	O
2.x	O
.	O
</s>
<s>
MNOS	B-Operating_System
became	O
the	O
first	O
fully	O
bilingual	O
version	O
of	O
Unix	O
,	O
and	O
uses	O
a	O
proprietary	O
8-bit	O
Cyrillic	O
script	O
character	O
set	O
,	O
U-code	O
,	O
which	O
was	O
dropped	O
in	O
favor	O
of	O
KOI-8	O
in	O
the	O
process	O
of	O
merging	O
with	O
DEMOS	B-Language
.	O
</s>
