<s>
In	O
computing	O
,	O
Russification	O
involves	O
the	O
localization	B-General_Concept
of	O
computers	O
and	O
software	B-General_Concept
,	O
allowing	O
the	O
user	B-Application
interface	I-Application
of	O
a	O
computer	O
and	O
its	O
software	B-General_Concept
to	O
communicate	O
in	O
the	O
Russian	O
language	O
using	O
Cyrillic	O
script	O
.	O
</s>
<s>
The	O
first	O
official	O
Russification	O
of	O
MS-DOS	B-Application
was	O
carried	O
out	O
for	O
MS-DOS	B-Application
4.01	O
in	O
1989/1990	O
,	O
released	O
on	O
.	O
</s>
<s>
A	O
Russian	O
version	O
of	O
MS-DOS	B-Application
5.0	O
was	O
also	O
developed	O
in	O
1991	O
,	O
released	O
on	O
.	O
</s>
<s>
Based	O
on	O
an	O
initiative	O
of	O
Microsoft	O
Germany	O
in	O
March	O
1991	O
,	O
derivates	O
of	O
the	O
Russian	O
MS-DOS	B-Application
5.0	O
drivers	O
used	O
for	O
keyboard	O
,	O
display	O
and	O
printer	O
localization	B-General_Concept
support	O
(	O
DISPLAY.SYS	O
,	O
EGA.CPI	O
,	O
EGA2.CPI	O
,	O
KEYB.COM	O
,	O
KEYBOARD.SYS	O
,	O
MSPRINT.SYS	O
,	O
COUNTRY.SYS	O
,	O
ALPHA.EXE	O
)	O
could	O
also	O
be	O
purchased	O
separately	O
(	O
with	O
English	O
messages	O
)	O
as	O
part	O
of	O
Microsoft	O
's	O
AlphabetPlus	O
kit	O
.	O
</s>
<s>
This	O
enabled	O
English	O
issues	O
of	O
MS-DOS	B-Application
3.3	O
,	O
4.01	O
and	O
5.0	O
to	O
be	O
set	O
up	O
for	O
Eastern	O
European	O
countries	O
like	O
Czechoslovakia	O
,	O
Poland	O
,	O
Hungary	O
,	O
Yugoslavia	O
,	O
Romania	O
and	O
Bulgaria	O
.	O
</s>
<s>
A	O
comprehensive	O
instruction	O
set	O
for	O
computer	B-Application
Russification	I-Application
is	O
maintained	O
by	O
Paul	O
Gorodyansky	O
.	O
</s>
