<s>
DOS/V	B-Application
is	O
a	O
Japanese	O
computing	O
initiative	O
starting	O
in	O
1990	O
to	O
allow	O
DOS	B-Device
on	O
IBM	B-Device
PC	I-Device
compatibles	O
with	O
VGA	B-Protocol
cards	I-Protocol
to	O
handle	O
double-byte	O
(	O
DBCS	B-Application
)	O
Japanese	O
text	O
via	O
software	O
alone	O
.	O
</s>
<s>
It	O
was	O
initially	O
developed	O
from	O
PC	B-Operating_System
DOS	I-Operating_System
by	O
IBM	O
for	O
its	O
PS/55	B-Device
machines	O
(	O
a	O
localized	O
version	O
of	O
the	O
PS/2	B-Protocol
)	O
,	O
but	O
IBM	O
gave	O
the	O
driver	O
source	O
code	O
to	O
Microsoft	O
,	O
who	O
then	O
licensed	O
a	O
DOS/V	B-Application
-compatible	O
version	O
of	O
MS-DOS	B-Application
to	O
other	O
companies	O
.	O
</s>
<s>
Kanji	O
fonts	O
and	O
other	O
locale	O
information	O
are	O
stored	O
on	O
the	O
hard	O
disk	O
rather	O
than	O
on	O
special	O
chips	O
as	O
in	O
the	O
preceding	O
AX	B-General_Concept
architecture	I-General_Concept
.	O
</s>
<s>
This	O
had	O
not	O
been	O
possible	O
under	O
NEC	O
's	O
proprietary	B-Application
PC-98	B-Operating_System
system	O
,	O
which	O
was	O
the	O
market	O
leader	O
before	O
DOS/V	B-Application
emerged	O
.	O
</s>
<s>
DOS/V	B-Application
stands	O
for	O
"	O
Disk	O
Operating	O
System/VGA	O
"	O
(	O
not	O
"	O
version	O
5	O
"	O
;	O
DOS/V	B-Application
came	O
out	O
at	O
approximately	O
the	O
same	O
time	O
as	O
DOS	B-Device
5	O
)	O
.	O
</s>
<s>
In	O
Japan	O
,	O
IBM	O
compatible	O
PCs	O
became	O
popular	O
along	O
with	O
DOS/V	B-Application
,	O
so	O
they	O
are	O
often	O
referred	O
to	O
as	O
"	O
DOS/V	B-Application
machine	O
"	O
or	O
"	O
DOS/V	B-Application
pasocom	O
"	O
even	O
though	O
DOS/V	B-Application
operating	O
systems	O
are	O
no	O
longer	O
common	O
.	O
</s>
<s>
The	O
promotion	O
of	O
DOS/V	B-Application
was	O
done	O
by	O
IBM	O
and	O
its	O
consortium	O
called	O
PC	B-Device
Open	I-Device
Architecture	I-Device
Developers	I-Device
 '	I-Device
Group	I-Device
(	O
OADG	B-Device
)	O
.	O
</s>
<s>
Digital	O
Research	O
released	O
a	O
Japanese	O
DOS/V	B-Application
-compatible	O
version	O
of	O
DR	O
DOS	B-Device
6.0	O
in	O
1992	O
.	O
</s>
<s>
In	O
the	O
early	O
1980s	O
,	O
IBM	O
Japan	O
developed	O
two	O
x86-based	O
personal	O
computer	O
lines	O
for	O
the	O
Asia-Pacific	O
region	O
,	O
IBM	B-Device
5550	I-Device
and	O
IBM	B-Device
JX	I-Device
.	O
</s>
<s>
The	O
JX	O
extends	O
IBM	B-Device
PCjr	I-Device
and	O
IBM	B-Device
PC	I-Device
architecture	O
.	O
</s>
<s>
It	O
supports	O
English	O
and	O
Japanese	O
versions	O
of	O
PC	B-Operating_System
DOS	I-Operating_System
with	O
720×512	O
resolution	O
monitor	O
.	O
</s>
<s>
Both	O
machines	O
could	O
n't	O
break	O
dominant	O
NEC	O
's	O
PC-98	B-Operating_System
in	O
consumer	O
market	O
in	O
Japan	O
.	O
</s>
<s>
The	O
JX	O
used	O
8088	B-Device
processor	O
instead	O
of	O
faster	O
8086	B-General_Concept
processor	O
because	O
IBM	O
thought	O
a	O
consumer-class	O
JX	O
must	O
n't	O
surpass	O
a	O
business-class	O
5550	O
.	O
</s>
<s>
IBM	O
Japan	O
planned	O
a	O
100%	O
PC/AT	B-Operating_System
compatible	O
machine	O
codenamed	O
"	O
JX2	O
"	O
,	O
but	O
cancelled	O
it	O
in	O
1986	O
.	O
</s>
<s>
Masahiko	O
Hatori	O
was	O
a	O
developer	O
of	O
JX	O
's	O
DOS	B-Device
.	O
</s>
<s>
In	O
1987	O
,	O
he	O
started	O
developing	O
the	O
DOS/V	B-Application
during	O
spare	O
time	O
at	O
IBM	O
Yamato	O
Development	O
Laboratory	O
.	O
</s>
<s>
He	O
thought	O
the	O
480-line	O
mode	O
of	O
VGA	B-Protocol
and	O
a	O
processor	O
as	O
fast	O
as	O
the	O
80386	B-General_Concept
would	O
realize	O
his	O
idea	O
,	O
but	O
they	O
were	O
expensive	O
hardwares	O
as	O
of	O
1987	O
.	O
</s>
<s>
In	O
this	O
era	O
,	O
Toshiba	O
released	O
the	O
J-3100	O
laptop	O
computer	O
,	O
and	O
Microsoft	O
introduced	O
the	O
AX	B-General_Concept
architecture	I-General_Concept
.	O
</s>
<s>
IBM	O
Japan	O
did	O
n't	O
join	O
in	O
the	O
AX	B-General_Concept
consortium	I-General_Concept
.	O
</s>
<s>
In	O
October	O
1987	O
,	O
IBM	O
Japan	O
released	O
the	O
PS/55	B-Device
Model	O
5535	O
which	O
was	O
a	O
proprietary	B-Application
laptop	O
using	O
a	O
special	O
version	O
of	O
DOS	B-Device
.	O
</s>
<s>
Hatori	O
thought	O
IBM	O
needed	O
to	O
shift	O
their	O
own	O
proprietary	B-Application
PC	O
to	O
IBM	B-Device
PC	I-Device
compatibles	O
.	O
</s>
<s>
In	O
summer	O
of	O
1989	O
,	O
they	O
decided	O
to	O
carry	O
out	O
the	O
development	O
of	O
DOS/V	B-Application
,	O
disclose	O
the	O
architecture	O
of	O
PS/55	B-Device
,	O
and	O
found	O
the	O
PC	B-Device
Open	I-Device
Architecture	I-Device
Developers	I-Device
 '	I-Device
Group	I-Device
(	O
OADG	B-Device
)	O
.	O
</s>
<s>
The	O
DOS/V	B-Application
development	O
team	O
designed	O
the	O
DOS/V	B-Application
to	O
be	O
simple	O
for	O
better	O
scalability	O
and	O
compatibility	O
with	O
original	O
PC	B-Operating_System
DOS	I-Operating_System
.	O
</s>
<s>
"	O
A	O
stopwatch	O
was	O
a	O
necessity	O
for	O
DOS/V	B-Application
development	O
"	O
,	O
Hatori	O
said	O
.	O
</s>
<s>
IBM	O
Japan	O
announced	O
the	O
first	O
version	O
of	O
DOS/V	B-Application
,	O
IBM	B-Operating_System
DOS	I-Operating_System
J4.0/V	O
,	O
on	O
11	O
October	O
1990	O
,	O
and	O
shipped	O
out	O
in	O
November	O
1990	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
,	O
IBM	O
Japan	O
released	O
the	O
PS/55	B-Device
Model	O
5535-S	O
,	O
a	O
laptop	O
computer	O
with	O
VGA	B-Protocol
resolution	O
.	O
</s>
<s>
The	O
announcement	O
letter	O
stated	O
DOS/V	B-Application
was	O
designed	O
for	O
low-end	O
desktops	O
and	O
laptops	O
of	O
PS/55	B-Device
,	O
but	O
users	O
reported	O
on	O
BBS	B-Application
that	O
they	O
could	O
run	O
DOS/V	B-Application
on	O
IBM	B-Device
PC	I-Device
clones	O
.	O
</s>
<s>
The	O
development	O
team	O
unofficially	O
confirmed	O
these	O
comments	O
,	O
and	O
modified	O
incompatibilities	O
of	O
DOS/V	B-Application
.	O
</s>
<s>
It	O
was	O
a	O
secret	O
inside	O
the	O
company	O
because	O
it	O
would	O
prevent	O
sales	O
of	O
PS/55	B-Device
and	O
meet	O
with	O
opposition	O
.	O
</s>
<s>
After	O
the	O
committee	O
,	O
Susumu	O
Furukawa	O
,	O
a	O
president	O
of	O
Microsoft	O
Japan	O
,	O
could	O
make	O
an	O
appointment	O
with	O
IBM	O
Japan	O
to	O
share	O
the	O
source	O
code	O
of	O
DOS/V	B-Application
.	O
</s>
<s>
On	O
20	O
December	O
1990	O
,	O
IBM	O
Japan	O
announced	O
they	O
founded	O
OADG	B-Device
and	O
Microsoft	O
would	O
supply	O
DOS/V	B-Application
for	O
other	O
PC	O
manufacturers	O
.	O
</s>
<s>
From	O
1992	O
to	O
1994	O
,	O
many	O
Japanese	O
manufacturers	O
began	O
selling	O
IBM	B-Device
PC	I-Device
clones	O
with	O
DOS/V	B-Application
.	O
</s>
<s>
Fujitsu	O
released	O
IBM	B-Device
PC	I-Device
clones	O
(	O
FMV	O
series	O
)	O
in	O
October	O
1993	O
,	O
and	O
about	O
200,000	O
units	O
were	O
shipped	O
in	O
1994	O
.	O
</s>
<s>
The	O
initial	O
goal	O
of	O
DOS/V	B-Application
was	O
to	O
enable	O
Japanese	O
software	O
to	O
run	O
on	O
laptop	O
computers	O
based	O
on	O
the	O
IBM	O
global	O
standards	O
rather	O
than	O
the	O
domestic	O
computer	O
architecture	O
.	O
</s>
<s>
As	O
of	O
1989	O
,	O
the	O
VGA	B-Protocol
was	O
not	O
common	O
,	O
but	O
they	O
expected	O
the	O
LCD	O
panels	O
with	O
VGA	B-Protocol
resolution	O
would	O
be	O
affordable	O
within	O
a	O
few	O
years	O
.	O
</s>
<s>
The	O
DOS/V	B-Application
lacked	O
its	O
software	O
library	O
,	O
so	O
IBM	O
Japan	O
requested	O
third-party	O
companies	O
to	O
port	O
their	O
software	O
to	O
the	O
DOS/V	B-Application
.	O
</s>
<s>
The	O
PS/55	B-Device
Model	O
5535-S	O
was	O
released	O
as	O
a	O
laptop	O
terminal	O
for	O
the	O
corporate	O
sector	O
.	O
</s>
<s>
They	O
only	O
had	O
to	O
supply	O
a	O
few	O
major	O
business	O
software	O
to	O
the	O
DOS/V	B-Application
.	O
</s>
<s>
In	O
March	O
1991	O
,	O
IBM	O
Japan	O
released	O
the	O
PS/55note	B-Device
Model	O
5523-S	O
which	O
was	O
the	O
lower-price	O
laptop	O
computer	O
.	O
</s>
<s>
It	O
was	O
a	O
strategically	O
important	O
product	O
to	O
popularize	O
the	O
DOS/V	B-Application
into	O
the	O
consumer	O
market	O
,	O
and	O
led	O
to	O
the	O
success	O
of	O
subsequent	O
consumer	O
products	O
such	O
as	O
the	O
ThinkPad	B-Operating_System
.	O
</s>
<s>
However	O
,	O
the	O
DOS/V	B-Application
itself	O
sold	O
much	O
better	O
than	O
the	O
5523S	O
because	O
advanced	O
users	O
purchased	O
it	O
to	O
build	O
a	O
Japanese	O
language	O
environment	O
on	O
their	O
IBM	O
compatible	O
PCs	O
.	O
</s>
<s>
In	O
1992	O
,	O
IBM	O
Japan	O
released	O
the	O
PS/V	O
(	O
similar	O
to	O
the	O
PS/ValuePoint	B-Device
)	O
and	O
the	O
ThinkPad	B-Operating_System
.	O
</s>
<s>
As	O
of	O
December	O
1992	O
,	O
the	O
PS/V	O
was	O
the	O
most	O
selling	O
DOS/V	B-Application
computer	O
.	O
</s>
<s>
In	O
January	O
1993	O
,	O
NEC	O
released	O
a	O
new	O
generation	O
of	O
the	O
PC-98	B-Operating_System
to	O
take	O
back	O
its	O
initiative	O
.	O
</s>
<s>
NEC	O
advertised	O
that	O
the	O
scrolling	O
speed	O
of	O
the	O
word	O
processor	O
Ichitaro	B-Application
on	O
the	O
PC-9801BX	O
was	O
faster	O
than	O
on	O
the	O
PS/V	O
2405-W	O
.	O
Yuzuru	O
Takemura	O
of	O
IBM	O
Japan	O
said	O
,	O
"	O
Let	O
us	O
suppose	O
the	O
movement	O
towards	O
Windows	O
is	O
inevitability	O
.	O
</s>
<s>
If	O
the	O
PC-98	B-Operating_System
holds	O
its	O
architecture	O
,	O
it	O
never	O
beat	O
our	O
machine	O
at	O
speed	O
.	O
</s>
<s>
Windows	O
is	O
developed	O
for	O
the	O
PC/AT	B-Operating_System
architecture	O
.	O
</s>
<s>
On	O
the	O
different	O
architecture	O
,	O
it	O
will	O
be	O
hard	O
to	O
tune	O
up	O
Windows	O
"	O
.In	O
1993	O
,	O
Microsoft	O
Japan	O
released	O
first	O
retail	O
versions	O
of	O
Windows	O
(	O
Windows	B-Application
3.1	I-Application
)	O
for	O
both	O
DOS/V	B-Application
and	O
PC-98	B-Operating_System
.	O
</s>
<s>
The	O
DOS/V	B-Application
contributed	O
the	O
dawn	O
of	O
IBM	B-Device
PC	I-Device
clones	O
in	O
Japan	O
,	O
yet	O
PC-98	B-Operating_System
had	O
kept	O
50%	O
of	O
market	O
share	O
until	O
1996	O
.	O
</s>
<s>
It	O
was	O
turned	O
round	O
by	O
the	O
release	O
of	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
Three	O
device	O
drivers	O
enable	O
DBCS	B-Application
code	O
page	O
support	O
in	O
DOS	B-Device
on	O
IBM	B-Device
PC	I-Device
compatibles	O
with	O
VGA	B-Protocol
;	O
the	O
font	O
driver	O
,	O
the	O
display	O
driver	O
and	O
the	O
input	O
assisted	O
subsystem	O
driver	O
.	O
</s>
<s>
The	O
font	O
driver	O
loads	O
a	O
complete	O
set	O
of	O
the	O
glyphs	O
from	O
a	O
font	O
file	O
into	O
the	O
extended	B-Device
memory	I-Device
.	O
</s>
<s>
The	O
display	O
driver	O
sets	O
the	O
640×480	O
graphics	O
mode	O
on	O
the	O
VGA	B-Protocol
,	O
and	O
allocates	O
about	O
20KB	O
of	O
the	O
conventional	B-Device
memory	I-Device
for	O
text	O
,	O
called	O
the	O
simulated	O
video	O
buffer	O
.	O
</s>
<s>
A	O
DOS/V	B-Application
program	O
writes	O
the	O
codes	O
of	O
the	O
characters	O
to	O
the	O
simulated	O
video	O
buffer	O
through	O
DOS	B-Device
output	O
functions	O
,	O
or	O
writes	O
them	O
directly	O
and	O
calls	O
driver	O
's	O
function	O
to	O
refresh	O
the	O
screen	O
.	O
</s>
<s>
The	O
display	O
driver	O
copies	O
the	O
font	O
bitmap	O
data	O
from	O
the	O
extended	B-Device
memory	I-Device
to	O
the	O
actual	O
video	O
memory	O
,	O
corresponding	O
to	O
the	O
simulated	O
video	O
buffer	O
.	O
</s>
<s>
The	O
input	O
assisted	O
subsystem	O
driver	O
communicates	O
with	O
optional	O
input	B-General_Concept
methods	I-General_Concept
and	O
enables	O
the	O
text	O
editing	O
in	O
the	O
on-the-spot	O
or	O
below-the-spot	O
styles	O
.	O
</s>
<s>
Without	O
installing	O
these	O
drivers	O
,	O
the	O
DOS/V	B-Application
is	O
equivalent	O
to	O
the	O
generic	O
MS-DOS	B-Application
without	O
DBCS	B-Application
code	O
page	O
support	O
.	O
</s>
<s>
In	O
1988	O
,	O
IBM	O
Japan	O
released	O
a	O
new	O
model	O
of	O
the	O
PS/55	B-Device
which	O
was	O
based	O
on	O
the	O
PS/2	B-Protocol
with	O
Japanese	O
language	O
support	O
.	O
</s>
<s>
It	O
is	O
equipped	O
with	O
a	O
proprietary	B-Application
video	O
card	O
,	O
the	O
Display	O
Adapter	O
,	O
which	O
has	O
a	O
high	O
resolution	O
text	B-Application
mode	I-Application
and	O
a	O
Japanese	O
character	O
set	O
stored	O
in	O
a	O
ROM	B-Device
on	O
the	O
card	O
.	O
</s>
<s>
It	O
supports	O
Japanese	O
DOS	B-Device
K3.3	O
,	O
PC	B-Operating_System
DOS	I-Operating_System
3.3	O
(	O
English	O
)	O
and	O
OS/2	B-Application
.	O
</s>
<s>
IBM	B-Operating_System
DOS	I-Operating_System
J4.0	O
was	O
released	O
in	O
1989	O
.	O
</s>
<s>
It	O
combines	O
Japanese	O
DOS	B-Device
and	O
PC	B-Operating_System
DOS	I-Operating_System
,	O
which	O
runs	O
Japanese	O
DOS	B-Device
as	O
the	O
Japanese	O
mode	O
(	O
PS/55	B-Device
mode	O
)	O
and	O
PC	B-Operating_System
DOS	I-Operating_System
as	O
the	O
English	O
mode	O
(	O
PS/2	B-Protocol
mode	O
)	O
.	O
</s>
<s>
This	O
version	O
requires	O
the	O
PS/55	B-Device
display	O
adapter	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
DOS/V	B-Application
,	O
IBM	B-Operating_System
DOS	I-Operating_System
J4.0/V	O
(	O
J4.05/V	O
)	O
,	O
was	O
released	O
in	O
the	O
end	O
of	O
1990	O
.	O
</s>
<s>
The	O
word	O
'	O
DOS/V	B-Application
'	O
was	O
quickly	O
known	O
to	O
Japanese	O
computer	O
industry	O
,	O
but	O
the	O
DOS/V	B-Application
itself	O
did	O
n't	O
spread	O
quickly	O
.	O
</s>
<s>
As	O
of	O
1991	O
,	O
some	O
small	O
companies	O
sold	O
American	O
or	O
Taiwanese	O
computers	O
in	O
Japan	O
,	O
but	O
DOS	B-Device
J4.0/V	O
caused	O
some	O
issues	O
on	O
PC	O
compatibles	O
.	O
</s>
<s>
Its	O
EMS	B-Device
driver	O
only	O
supports	O
IBM	O
's	O
Expanded	B-Device
Memory	I-Device
Adapter	I-Device
.	O
</s>
<s>
The	O
input	B-General_Concept
method	I-General_Concept
does	O
n't	O
support	O
the	O
US	O
keyboard	O
nor	O
the	O
Japanese	O
AX	O
keyboard	O
,	O
so	O
it	O
locates	O
some	O
keys	O
at	O
the	O
wrong	O
place	O
.	O
</s>
<s>
PS/55	B-Device
keyboards	O
were	O
available	O
from	O
IBM	O
,	O
but	O
it	O
must	O
be	O
used	O
with	O
an	O
AT	O
to	O
PS/2	B-Protocol
adapter	O
because	O
AX	O
machines	O
(	O
thus	O
PC/AT	B-Operating_System
clones	O
)	O
generally	O
have	O
the	O
older	O
5-pin	O
DIN	O
connector	O
.	O
</s>
<s>
Scrolling	O
text	O
with	O
the	O
common	O
Tseng	B-General_Concept
Labs	I-General_Concept
ET4000	I-General_Concept
graphics	O
controller	O
makes	O
the	O
screen	O
unreadable	O
.	O
</s>
<s>
This	O
issue	O
can	O
be	O
fixed	O
by	O
the	O
new	O
/HS	O
=	O
LC	O
switch	O
of	O
$	O
DISP.SYS	O
in	O
DOS	B-Device
J4.07/V	O
.	O
</s>
<s>
"	O
Some	O
VGA	B-Protocol
clones	O
did	O
not	O
correctly	O
implement	O
the	O
CRTC	O
address	O
wraparound	O
.	O
</s>
<s>
Most	O
likely	O
those	O
were	O
Super	O
VGAs	B-Protocol
with	O
more	O
video	O
memory	O
than	O
the	O
original	O
VGA	B-Protocol
(	O
i.e.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
the	O
split	O
screen	O
technique	O
was	O
relatively	O
well	O
documented	O
and	O
well	O
understood	O
,	O
and	O
commercial	B-Application
software	I-Application
(	O
especially	O
games	O
)	O
sometimes	O
used	O
it	O
.	O
</s>
<s>
IBM	O
Japan	O
released	O
DOS	B-Device
J5.0/V	O
in	O
October	O
1991	O
,	O
and	O
DOS	B-Device
J5.0	O
in	O
December	O
1991	O
.	O
</s>
<s>
DOS	B-Device
J5.0	O
combines	O
Japanese	O
DOS	B-Device
and	O
DOS/V	B-Application
.	O
</s>
<s>
This	O
is	O
the	O
last	O
version	O
developed	O
for	O
the	O
PS/55	B-Device
display	O
adapter	O
.	O
</s>
<s>
DOS	B-Device
J5.02/V	O
was	O
released	O
in	O
March	O
1992	O
.	O
</s>
<s>
It	O
added	O
official	O
support	O
for	O
the	O
IBM	B-Device
PS/2	I-Device
and	O
the	O
US	O
English	O
layout	O
keyboard	O
.	O
</s>
<s>
The	O
development	O
of	O
MS-DOS	B-Application
5.0/V	O
was	O
delayed	O
because	O
IBM	O
and	O
Microsoft	O
disputed	O
how	O
to	O
implement	O
the	O
API	B-General_Concept
for	O
input	B-General_Concept
methods	I-General_Concept
.	O
</s>
<s>
It	O
took	O
a	O
few	O
months	O
to	O
make	O
an	O
agreement	O
that	O
the	O
OEM	O
adaptation	O
kit	O
(	O
OAK	O
)	O
of	O
MS-DOS	B-Application
5.0/V	O
provided	O
both	O
IAS	O
(	O
Input	O
Assist	O
Subsystem	O
)	O
and	O
MKKC	O
(	O
Microsoft	O
Kana-Kanji	O
Conversion	O
)	O
.	O
</s>
<s>
Microsoft	O
planned	O
to	O
add	O
the	O
AX	O
application	O
support	O
into	O
DOS/V	B-Application
,	O
but	O
cancelled	O
it	O
because	O
its	O
beta	O
release	O
was	O
strongly	O
criticized	O
by	O
users	O
for	O
lacking	O
compatibility	O
.	O
</s>
<s>
Some	O
PC	O
manufacturers	O
could	O
n't	O
wait	O
Microsoft	O
's	O
DOS/V	B-Application
.	O
</s>
<s>
Toshiba	O
developed	O
a	O
DOS/V	B-Application
emulator	O
that	O
could	O
run	O
DOS/V	B-Application
applications	O
on	O
a	O
VGA-equipped	O
J-3100	O
computer	O
.	O
</s>
<s>
AST	O
Research	O
Japan	O
and	O
Sharp	O
decided	O
to	O
bundle	O
IBM	B-Operating_System
DOS	I-Operating_System
J5.0/V	O
.	O
</s>
<s>
Compaq	O
developed	O
own	O
DOS/V	B-Application
drivers	O
,	O
and	O
released	O
their	O
first	O
DOS/V	B-Application
computers	O
in	O
April	O
1992	O
.	O
</s>
<s>
On	O
10	O
December	O
1993	O
,	O
Microsoft	O
Japan	O
and	O
IBM	O
Japan	O
released	O
new	O
versions	O
of	O
DOS/V	B-Application
,	O
MS-DOS	B-Application
6.2/V	O
Upgrade	O
and	O
PC	B-Operating_System
DOS	I-Operating_System
J6.1/V	O
.	O
</s>
<s>
MS-DOS	B-Application
6.2/V	O
Upgrade	O
is	O
the	O
only	O
Japanese	O
version	O
of	O
MS-DOS	B-Application
released	O
by	O
Microsoft	O
under	O
its	O
own	O
brand	O
for	O
retail	O
sales	O
.	O
</s>
<s>
Microsoft	O
Japan	O
continued	O
selling	O
it	O
after	O
Microsoft	O
released	O
MS-DOS	B-Application
6.22	O
to	O
resolve	O
patent	O
infringement	O
of	O
DoubleSpace	B-General_Concept
disk	O
compression	O
.	O
</s>
<s>
IBM	O
Japan	O
ended	O
support	O
for	O
PC	B-Operating_System
DOS	I-Operating_System
2000	O
on	O
31	O
January	O
2001	O
,	O
and	O
Microsoft	O
Japan	O
ended	O
support	O
for	O
MS-DOS	B-Application
on	O
31	O
December	O
2001	O
.	O
</s>
<s>
Japanese	O
versions	O
of	O
Windows	B-Application
2000	I-Application
and	O
XP	B-Application
have	O
a	O
DOS/V	B-Application
environment	O
in	O
NTVDM	O
.	O
</s>
<s>
It	O
was	O
removed	O
in	O
Windows	B-Application
Vista	I-Application
.	O
</s>
<s>
PC	O
DOS	B-Device
versions	O
of	O
DOS/V	B-Application
(	O
J	O
for	O
Japanese	O
,	O
P	O
for	O
Chinese	O
(	O
PRC	O
)	O
,	O
T	O
for	O
Taiwanese	O
,	O
H	O
for	O
Korean	O
(	O
Hangul	O
)	O
)	O
:	O
</s>
<s>
MS-DOS	B-Application
versions	O
of	O
DOS/V	B-Application
:	O
</s>
<s>
DR	O
DOS	B-Device
versions	O
of	O
DOS/V	B-Application
:	O
</s>
<s>
Novell	O
DOS	B-Device
7	O
(	O
Japanese	O
)	O
?	O
</s>
<s>
IBM	B-Application
DOS/V	I-Application
Extension	I-Application
extends	O
DOS/V	B-Application
drivers	O
to	O
set	O
up	O
a	O
variety	O
of	O
text	B-Application
modes	I-Application
for	O
certain	O
video	O
adapters	O
.	O
</s>
<s>
The	O
High-quality	O
Text	B-Application
Mode	I-Application
is	O
the	O
default	O
80	O
columns	O
by	O
25	O
rows	O
with	O
12×24	O
pixels	O
large	O
characters	O
.	O
</s>
<s>
The	O
High-density	O
Text	B-Application
Mode	I-Application
(	O
Variable	O
Text	O
;	O
V-Text	O
)	O
offers	O
large	O
text	B-Application
modes	I-Application
with	O
various	O
font	O
sizes	O
.	O
</s>
<s>
DOS/V	B-Application
Extension	I-Application
V1.0	O
included	O
drivers	O
for	O
VGA	B-Protocol
,	O
XGA	B-Device
,	O
PS/55	B-Device
Display	O
Adapter	O
,	O
SVGA	O
(	O
800×600	O
)	O
and	O
ET4000	B-General_Concept
(	O
1024×768	O
)	O
.	O
</s>
<s>
Some	O
of	O
its	O
drivers	O
were	O
included	O
in	O
PC	B-Operating_System
DOS	I-Operating_System
J6.1/V	O
and	O
later	O
.	O
</s>
