<s>
The	O
Compaq	B-Device
Portable	I-Device
III	I-Device
(	O
Model	O
2660	O
)	O
is	O
a	O
PC/AT	O
-compatible	O
computer	O
released	O
by	O
Compaq	O
Computer	O
Corporation	O
in	O
1987	O
.	O
</s>
<s>
It	O
was	O
advertised	O
as	O
being	O
much	O
smaller	O
and	O
lighter	O
than	O
the	O
previous	O
portable	O
x86-PCs	O
;	O
however	O
it	O
was	O
still	O
quite	O
large	O
by	O
today	O
's	O
standards	O
.	O
</s>
<s>
The	O
Model	O
1	O
had	O
a	O
list	O
price	O
of	O
and	O
was	O
equipped	O
with	O
a	O
Intel	B-General_Concept
80286	I-General_Concept
,	O
640	O
kilobytes	O
of	O
RAM	B-Architecture
,	O
floppy	B-Device
drive	I-Device
,	O
and	O
a	O
colored	O
gas-plasma	O
display	O
.	O
</s>
<s>
The	O
Portable	O
III	O
was	O
designed	O
to	O
be	O
the	O
smallest	O
,	O
lightest	O
and	O
fastest	O
386	O
machine	O
,	O
since	O
Compaq	O
was	O
under	O
the	O
pressure	O
from	O
Toshiba	O
with	O
its	O
T1100	B-Device
and	O
T3100	B-Device
and	O
Zenith	O
Data	O
Systems	O
with	O
its	O
Z-181	O
.	O
</s>
<s>
Compaq	O
only	O
had	O
286	B-General_Concept
motherboards	O
ready	O
for	O
mass	O
production	O
,	O
so	O
the	O
386	O
version	O
,	O
the	O
Compaq	B-Device
Portable	I-Device
386	I-Device
,	O
would	O
follow	O
about	O
one	O
year	O
later	O
.	O
</s>
<s>
The	O
design	O
of	O
the	O
Portable	O
III	O
had	O
been	O
deeply	O
modified	O
over	O
the	O
earlier	O
Compaq	B-Device
portable	I-Device
series	I-Device
of	O
machines	O
.	O
</s>
<s>
The	O
optional	O
80287	O
coprocessor	O
ran	O
at	O
8	O
MHz	O
regardless	O
of	O
the	O
speed	O
of	O
the	O
80286	B-General_Concept
,	O
and	O
the	O
640	O
KB	O
of	O
RAM	B-Architecture
were	O
made	O
up	O
of	O
100-ns	O
256K-bit	O
chips	O
.	O
</s>
<s>
The	O
Portable	O
III	O
lacked	O
the	O
internal	O
expansion	O
ports	O
of	O
previous	O
Portables	O
and	O
desktop	O
PCs	O
of	O
the	O
time	O
,	O
but	O
Compaq	O
offered	O
an	O
optional	O
external	O
expansion	O
unit	O
(	O
model	O
2662A	O
)	O
,	O
that	O
provided	O
two	O
full	O
length	O
,	O
16-bit	O
ISA	B-Architecture
add-in	O
cards	O
for	O
$199	O
.	O
</s>
