<s>
The	O
Leading	B-Device
Edge	I-Device
Model	I-Device
D	I-Device
is	O
an	O
IBM	O
clone	O
first	O
released	O
by	O
Leading	O
Edge	O
Hardware	O
in	O
July	O
1985	O
.	O
</s>
<s>
It	O
was	O
initially	O
priced	O
at	O
$	O
1,495	O
configured	O
with	O
dual	O
5.25	B-Device
"	I-Device
floppy	B-Device
drives	I-Device
,	O
256	O
KB	O
of	O
RAM	B-Architecture
,	O
and	O
a	O
monochrome	B-Device
monitor	I-Device
.	O
</s>
<s>
Kahng	O
later	O
became	O
CEO	O
of	O
Macintosh	B-Device
clone	O
maker	O
Power	O
Computing	O
.	O
</s>
<s>
The	O
Model	O
D	O
initially	O
featured	O
an	O
Intel	B-Device
8088	I-Device
microprocessor	B-Architecture
at	O
4.77MHz	O
,	O
although	O
later	O
models	O
had	O
a	O
switch	O
in	O
the	O
back	O
to	O
run	O
at	O
4.77MHz	O
(	O
normal	O
)	O
or	O
7.16MHz	O
(	O
high	O
)	O
.	O
</s>
<s>
The	O
addition	O
of	O
the	O
Intel	B-Device
8087	I-Device
floating	O
point	O
unit	O
(	O
FPU	O
)	O
coprocessor	B-General_Concept
is	O
supported	O
in	O
all	O
Leading	B-Device
Edge	I-Device
Model	I-Device
D	I-Device
revisions	O
with	O
an	O
onboard	O
40-pin	O
DIP	O
socket	O
.	O
</s>
<s>
Unlike	O
the	O
IBM	B-Device
PC	I-Device
and	O
IBM	B-Device
PC/XT	I-Device
,	O
the	O
Model	O
D	O
integrates	O
video	O
,	O
the	O
disk	O
controller	O
,	O
a	O
battery	O
backed	O
clock	O
(	O
real-time	O
clock	O
or	O
RTC	O
)	O
,	O
serial	O
,	O
and	O
parallel	O
ports	O
directly	O
onto	O
the	O
motherboard	O
rather	O
than	O
putting	O
them	O
on	O
plug-in	O
cards	O
.	O
</s>
<s>
This	O
allows	O
the	O
Model	O
D	O
to	O
be	O
half	O
the	O
size	O
of	O
the	O
IBM	B-Device
PC	I-Device
,	O
with	O
four	O
free	O
ISA	B-Architecture
expansion	O
slots	O
compared	O
to	O
the	O
PC	O
's	O
one	O
slot	O
after	O
installing	O
necessary	O
cards	O
.	O
</s>
<s>
The	O
Model	O
D	O
is	O
preinstalled	O
with	O
256	O
,	O
512	O
,	O
or	O
640KB	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
Motherboard	O
revisions	O
7	O
,	O
8	O
,	O
WC1	O
and	O
WC2	O
come	O
with	O
768KB	O
of	O
RAM	B-Architecture
installed	O
(	O
640	O
KB	O
available	O
to	O
the	O
user	O
)	O
.	O
</s>
<s>
Some	O
models	O
have	O
a	O
monochrome/CGA	O
selection	O
switch	O
,	O
with	O
a	O
single	O
port	O
used	O
for	O
both	O
modes	O
.	O
</s>
<s>
Some	O
models	O
have	O
both	O
a	O
Monochrome	O
and	O
a	O
CGA	B-Device
port	O
,	O
also	O
with	O
a	O
switch	O
to	O
change	O
modes	O
(	O
and	O
ports	O
)	O
.	O
</s>
<s>
The	O
buyer	O
had	O
the	O
choice	O
between	O
a	O
floppy	B-Device
disk	I-Device
model	O
and	O
a	O
fixed	B-Device
disk	I-Device
(	O
hard	B-Device
disk	I-Device
)	O
model	O
.	O
</s>
<s>
The	O
floppy	B-Device
disk	I-Device
model	O
has	O
one	O
or	O
two	O
360	O
KB	O
drives	O
,	O
so	O
that	O
the	O
user	O
can	O
run	O
MS-DOS	B-Application
programs	O
on	O
the	O
primary	O
drive	O
and	O
work	O
with	O
files	O
on	O
the	O
secondary	O
drive	O
,	O
if	O
equipped	O
.	O
</s>
<s>
The	O
fixed	B-Device
disk	I-Device
model	O
has	O
one	O
360	O
KB	O
floppy	B-Device
drive	I-Device
and	O
either	O
a	O
10	O
MB	O
,	O
20	O
MB	O
,	O
or	O
30	O
MB	O
hard	B-Device
disk	I-Device
.	O
</s>
<s>
The	O
model	O
with	O
the	O
20	O
MB	O
fixed	B-Device
disk	I-Device
was	O
initially	O
released	O
in	O
February	O
1986	O
at	O
a	O
cost	O
of	O
$	O
1,895	O
.	O
</s>
<s>
The	O
buyer	O
also	O
had	O
a	O
choice	O
between	O
an	O
amber	O
or	O
a	O
green	O
monochrome	B-Device
CRT	I-Device
monitor	O
.	O
</s>
<s>
Modern	O
expansions	O
are	O
possible	O
for	O
the	O
Model	O
D	O
,	O
including	O
the	O
use	O
of	O
an	O
XT-IDE	O
8-bit	O
ISA	B-Architecture
card	I-Architecture
,	O
which	O
provides	O
an	O
Parallel	O
ATA	O
IDE	O
port	O
for	O
hard	B-Device
disk	I-Device
drives	I-Device
and	O
a	O
compact	B-Device
flash	I-Device
card	I-Device
.	O
</s>
<s>
However	O
,	O
it	O
is	O
possible	O
to	O
disable	O
the	O
Real-Time	O
Clock	O
by	O
removing	O
clip	O
#2	O
from	O
J13	O
and	O
deleting	O
the	O
"	O
DEVICE	O
=	O
CLKDVR.SYS	O
"	O
entry	O
from	O
the	O
'	O
CONFIG.SYS	B-Device
'	O
.	O
</s>
<s>
The	O
Model	O
D	O
also	O
fully	O
supports	O
in	O
the	O
NEC	B-Device
V20	I-Device
microprocessor	B-Architecture
in	O
place	O
of	O
its	O
Intel	B-Device
8088	I-Device
processor	O
.	O
</s>
<s>
All	O
Model	O
D	O
computers	O
support	O
the	O
addition	O
of	O
an	O
8-bit	O
or	O
8/16	O
-bit	O
VGA	B-Protocol
ISA	B-Architecture
card	I-Architecture
for	O
VGA	B-Protocol
graphics	I-Protocol
.	O
</s>
<s>
The	O
unit	O
comes	O
with	O
MS-DOS	B-Application
2.11	O
or	O
later	O
,	O
and	O
a	O
special	O
edition	O
of	O
GW-BASIC	B-Language
to	O
support	O
the	O
extended	O
graphics	O
mode	O
.	O
</s>
<s>
This	O
disk	O
contained	O
a	O
diagnostics	O
program	O
,	O
and	O
'	O
PARK.COM	O
'	O
,	O
a	O
utility	O
used	O
to	O
park	O
the	O
hard	B-Device
drive	I-Device
heads	O
when	O
the	O
computer	O
was	O
to	O
be	O
moved	O
.	O
</s>
<s>
The	O
computer	O
supports	O
the	O
Microsoft	B-Application
Windows	I-Application
operating	I-Application
system	I-Application
up	O
to	O
version	B-Application
3.0	I-Application
,	O
as	O
it	O
is	O
the	O
last	O
version	O
of	O
Windows	O
to	O
support	O
Real	B-Application
Mode	I-Application
.	O
</s>
<s>
The	O
Model	O
D	O
was	O
the	O
first	O
Korean-made	O
PC	O
to	O
be	O
sold	O
in	O
the	O
United	O
States	O
,	O
and	O
at	O
the	O
time	O
of	O
its	O
introduction	O
,	O
it	O
undercut	O
the	O
price	O
of	O
similar	O
IBM	B-Device
PC	I-Device
compatibles	O
by	O
$500	O
.	O
</s>
<s>
The	O
$	O
1,495	O
list	O
price	O
was	O
the	O
lowest	O
of	O
seven	O
compatibles	O
with	O
comparable	O
configurations	O
in	O
a	O
September	O
1985	O
InfoWorld	O
chart	O
,	O
and	O
under	O
half	O
the	O
price	O
of	O
the	O
$	O
2,820	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
Along	O
with	O
the	O
Tandy	O
1000	O
and	O
Epson	B-Device
Equity	I-Device
series	O
,	O
the	O
Model	O
D	O
was	O
one	O
of	O
the	O
first	O
IBM	B-Device
PC	I-Device
compatible	O
computers	O
to	O
become	O
popular	O
for	O
home	O
use	O
,	O
due	O
to	O
its	O
low	O
price	O
and	O
good	O
reviews	O
.	O
</s>
<s>
Leading	O
Edge	O
was	O
Phoenix	O
Technologies	O
's	O
first	O
customer	O
for	O
its	O
IBM-compatible	O
BIOS	B-Operating_System
,	O
and	O
the	O
Model	O
D	O
was	O
one	O
of	O
the	O
first	O
PCs	O
on	O
the	O
market	O
to	O
use	O
the	O
Phoenix	O
BIOS	B-Operating_System
.	O
</s>
<s>
Although	O
advertised	O
as	O
100%	O
IBM	O
compatible	O
,	O
letters	O
published	O
in	O
the	O
January	O
13	O
,	O
1986	O
issue	O
of	O
InfoWorld	O
identified	O
compatibility	O
issues	O
with	O
several	O
popular	O
software	O
packages	O
and	O
aftermarket	O
hard	B-Device
drives	I-Device
.	O
</s>
<s>
The	O
magazine	O
praised	O
the	O
computer	O
's	O
value	O
and	O
ease	O
of	O
setup	O
(	O
"	O
the	O
whole	O
operation	O
takes	O
less	O
than	O
20	O
minutes	O
,	O
even	O
if	O
you	O
know	O
nothing	O
about	O
computers	O
and	O
take	O
your	O
time	O
"	O
)	O
,	O
and	O
reported	O
that	O
the	O
Model	O
D	O
was	O
even	O
compatible	O
with	O
IBM	O
diagnostic	O
software	O
,	O
unlike	O
the	O
Compaq	B-Device
Portable	I-Device
and	O
others	O
.	O
</s>
