<s>
The	O
IBM	B-Device
JX	I-Device
(	O
or	O
JXPC	B-Device
)	O
was	O
a	O
personal	B-Device
computer	I-Device
released	O
in	O
1984	O
into	O
the	O
Japanese	O
,	O
Australian	O
and	O
New	O
Zealand	O
markets	O
.	O
</s>
<s>
Designed	O
in	O
Japan	O
,	O
it	O
was	O
based	O
on	O
the	O
technology	O
of	O
the	O
IBM	B-Device
PCjr	I-Device
and	O
was	O
designated	O
the	O
IBM	B-Device
5511	I-Device
.	O
</s>
<s>
The	O
JX	O
was	O
the	O
first	O
IBM	O
PC	O
to	O
use	O
3.5	B-Device
"	I-Device
floppy	B-Device
drives	I-Device
.	O
</s>
<s>
The	O
IBM	B-Device
JX	I-Device
's	O
main	O
difference	O
from	O
the	O
PCjr	B-Device
was	O
a	O
professional	O
keyboard	O
(	O
rather	O
than	O
the	O
PCjr	B-Device
's	O
disparaged	O
chiclet	B-Device
keyboard	I-Device
)	O
,	O
dual	O
3.5	B-Device
"	I-Device
floppy	B-Device
drives	I-Device
,	O
as	O
well	O
as	O
options	O
for	O
a	O
5.25	B-Device
"	I-Device
floppy	B-Device
drive	I-Device
and	O
a	O
hard	O
drive	O
,	O
both	O
of	O
which	O
sat	O
atop	O
the	O
main	O
unit	O
.	O
</s>
<s>
The	O
JX	O
did	O
not	O
support	O
PCjr-like	O
"	O
sidecar	O
"	O
add-ons	O
for	O
hardware	O
expansion	O
.	O
</s>
<s>
In	O
common	O
with	O
the	O
PCjr	B-Device
,	O
however	O
,	O
it	O
had	O
no	O
DMA	B-General_Concept
controller	I-General_Concept
.	O
</s>
<s>
It	O
also	O
supported	O
the	O
otherwise	O
unique-in-the-IBM-PC-world	O
ECGA	O
(	O
Enhanced	O
Color	B-Device
Graphics	I-Device
Adapter	I-Device
—	O
16	O
simultaneous	O
colors	O
,	O
but	O
only	O
at	O
320×200	O
resolution	O
)	O
and	O
the	O
PCjr	B-Device
's	O
4-channel	O
sound	O
.	O
</s>
<s>
In	O
Japan	O
,	O
both	O
white	O
and	O
dark	O
gray	O
units	O
were	O
available	O
,	O
but	O
elsewhere	O
all	O
IBM	O
JXs	O
were	O
dark	O
grayvery	O
unusual	O
in	O
the	O
days	O
of	O
the	O
standard	O
color	O
of	O
IBM	O
"	O
beige	B-General_Concept
boxes	I-General_Concept
"	O
.	O
</s>
<s>
The	O
Extended	O
Display	O
Cartridge	O
provides	O
40×25	O
Japanese	O
text	O
mode	O
,	O
and	O
its	O
display	O
resolution	O
is	O
720×512	O
pixels	O
like	O
a	O
16	O
pixel	O
font	O
model	O
of	O
the	O
IBM	B-Device
5550	I-Device
.	O
</s>
<s>
However	O
,	O
one	O
disadvantage	O
it	O
shared	O
with	O
the	O
PCjr	B-Device
was	O
that	O
it	O
could	O
not	O
use	O
the	O
standard	O
ISA	O
bus	O
cards	O
of	O
the	O
IBM	O
PC	O
.	O
</s>
<s>
Like	O
the	O
PC	O
,	O
if	O
the	O
system	O
was	O
left	O
to	O
boot	O
without	O
inserting	O
a	O
diskette	B-Device
into	O
one	O
of	O
the	O
drives	O
the	O
Microsoft	O
Cassette	O
BASIC	O
interpreter	O
would	O
be	O
loaded	O
,	O
which	O
was	O
compatible	O
with	O
IBM	B-Device
PCjr	I-Device
BASIC	O
,	O
including	O
Cartridge	O
BASIC	O
.	O
</s>
<s>
PC	O
DOS	O
2.11	O
could	O
only	O
use	O
half	O
of	O
the	O
tracks	O
of	O
a	O
3.5	B-Device
"	I-Device
drive	O
,	O
however	O
,	O
since	O
it	O
did	O
n't	O
really	O
understand	O
what	O
a	O
3.5	B-Device
"	I-Device
drive	O
even	O
was	O
.	O
</s>
<s>
The	O
PCjx	O
's	O
BIOS	O
could	O
only	O
address	O
the	O
first	O
40	O
tracks	O
,	O
like	O
a	O
5.25	B-Device
"	I-Device
drive	O
.	O
</s>
<s>
The	O
PCjx	O
later	O
had	O
a	O
BIOS	O
upgrade	O
chip	O
,	O
sold	O
together	O
with	O
PC	O
DOS	O
3.21	O
,	O
which	O
could	O
use	O
the	O
full	O
720	O
KB	O
capacity	O
of	O
the	O
diskette	B-Device
drives	I-Device
.	O
</s>
<s>
Some	O
popular	O
options	O
for	O
the	O
PCjx	O
were	O
a	O
5.25	B-Device
"	I-Device
360	O
KB	O
capacity	O
diskette	B-Device
drive	O
,	O
a	O
10	O
MB	O
external	O
hard	O
disk	O
(	O
both	O
of	O
these	O
as	O
stackable	O
units	O
the	O
same	O
size	O
as	O
the	O
JX	O
itself	O
)	O
and	O
a	O
joystick	O
.	O
</s>
<s>
IBM	O
never	O
released	O
a	O
3270	O
emulation	O
adapter	O
for	O
the	O
PCjx	O
,	O
in	O
order	O
to	O
steer	O
enterprise	O
customers	O
to	O
more-expensive	O
IBM	O
PCs	B-Device
and	O
XTs	O
.	O
</s>
<s>
BYTE	B-Application
in	O
1985	O
called	O
the	O
JX	O
"	O
a	O
Japanese	O
product	O
for	O
the	O
Japanese	O
;	O
its	O
price	O
and	O
capabilities	O
reflect	O
its	O
target	O
market	O
"	O
.	O
</s>
<s>
The	O
magazine	O
stated	O
that	O
its	O
compatibility	O
with	O
PCjr	B-Device
peripherals	O
rather	O
than	O
the	O
PC	O
's	O
,	O
and	O
joystick	O
ports	O
and	O
audio	O
,	O
"	O
suggests	O
that	O
IBM	O
Japan	O
is	O
hedging	O
its	O
bets	O
by	O
pursuing	O
a	O
share	O
of	O
the	O
easily	O
saturated	O
video-game	O
sector	O
"	O
.	O
</s>
<s>
BYTE	B-Application
concluded	O
that	O
"	O
the	O
JX	O
will	O
enjoy	O
,	O
at	O
best	O
,	O
a	O
modest	O
and	O
short-lived	O
it	O
's	O
too	O
little	O
,	O
too	O
late	O
"	O
against	O
more-sophisticated	O
rival	O
computers	O
.	O
</s>
<s>
According	O
to	O
the	O
Nikkei	O
Personal	B-Device
Computing	I-Device
journal	O
,	O
a	O
distributor	O
revealed	O
the	O
number	O
of	O
units	O
sold	O
was	O
"	O
around	O
2,000	O
units	O
in	O
Japan	O
alone	O
"	O
,	O
and	O
an	O
industry	O
insider	O
expected	O
"	O
Sales	O
to	O
retail	O
stores	O
,	O
overseas	O
stores	O
,	O
IBM	O
's	O
employees	O
,	O
their	O
family	O
,	O
and	O
direct	O
sales	O
to	O
large	O
customers	O
.	O
</s>
<s>
The	O
Japanese	O
home	O
computer	O
market	O
was	O
much	O
smaller	O
than	O
its	O
video	B-Device
game	I-Device
console	I-Device
market	O
compared	O
with	O
Western	O
countries	O
,	O
yet	O
NEC	O
sold	O
75,000	O
units	O
of	O
PC-88	B-Device
in	O
the	O
four	O
months	O
since	O
November	O
1985	O
.	O
</s>
<s>
Many	O
people	O
pointed	O
out	O
the	O
matter	O
was	O
adopting	O
the	O
8088	B-Device
processor	O
.	O
</s>
<s>
In	O
Japan	O
,	O
the	O
mainstream	O
of	O
Intel	O
microprocessors	O
was	O
moving	O
from	O
the	O
8086	B-General_Concept
to	O
the	O
80286	B-General_Concept
,	O
and	O
computer	O
enthusiasts	O
considered	O
the	O
8088	B-Device
as	O
a	O
branch	O
of	O
them	O
.	O
</s>
<s>
Also	O
,	O
a	O
novice	O
personal	B-Device
computer	I-Device
user	O
generally	O
chose	O
his	O
new	O
machine	O
with	O
the	O
advice	O
of	O
his	O
closest	O
acquaintance	O
familiar	O
with	O
personal	B-Device
computers	I-Device
.	O
</s>
<s>
A	O
developer	O
of	O
the	O
JX	O
insisted	O
it	O
was	O
designed	O
to	O
run	O
western	O
PCjr	B-Device
softwares	O
without	O
modification	O
,	O
but	O
few	O
Japanese	O
users	O
wanted	O
them	O
.	O
</s>
<s>
The	O
JX	O
was	O
the	O
first	O
IBM	O
PC	O
compatible	O
computer	O
sold	O
by	O
IBM	O
Japan	O
,	O
but	O
they	O
started	O
selling	O
the	O
PC/XT	B-Device
and	O
PC/AT	B-Operating_System
in	O
November	O
1985	O
.	O
</s>
<s>
The	O
IBM	B-Device
5550	I-Device
sold	O
well	O
for	O
Japanese	O
companies	O
who	O
used	O
IBM	O
's	O
mainframe	O
computer	O
.	O
</s>
<s>
However	O
,	O
in	O
February	O
1985	O
,	O
IBM	O
Japan	O
released	O
the	O
IBM	O
5540	O
as	O
the	O
entry-level	O
line	O
of	O
the	O
IBM	B-Device
5550	I-Device
.	O
</s>
<s>
The	O
Nikkei	O
Personal	B-Device
Computing	I-Device
journal	O
pointed	O
out	O
both	O
were	O
developed	O
at	O
the	O
same	O
time	O
at	O
the	O
Fujisawa	O
Development	O
Laboratory	O
,	O
and	O
suspected	O
that	O
IBM	O
Japan	O
was	O
imposed	O
to	O
release	O
the	O
JX	O
first	O
by	O
its	O
parent	O
company	O
,	O
IBM	O
.	O
</s>
<s>
He	O
also	O
revealed	O
the	O
reason	O
why	O
the	O
JX	O
used	O
the	O
8088	B-Device
processor	O
was	O
both	O
the	O
development	O
and	O
sales	O
teams	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>
The	O
company	O
planned	O
a	O
100%	O
PC/AT	B-Operating_System
compatible	O
machine	O
"	O
JX	O
II	O
"	O
which	O
could	O
handle	O
Japanese	O
text	O
like	O
the	O
JX	O
did	O
,	O
but	O
was	O
cancelled	O
in	O
1986	O
.	O
</s>
<s>
They	O
never	O
developed	O
a	O
consumer	O
product	O
until	O
they	O
entered	O
the	O
education	O
sector	O
with	O
the	O
PS/55Z	B-Device
in	O
1988	O
.	O
</s>
