<s>
The	O
Compaq	O
Portable	O
486	B-General_Concept
is	O
a	O
computer	O
released	O
by	O
Compaq	O
Computer	O
Corporation	O
in	O
1991	O
.	O
</s>
<s>
It	O
was	O
the	O
last	O
portable	O
computer/	O
"	O
luggable	B-Device
"	O
released	O
under	O
the	O
Compaq	B-Device
Portable	I-Device
series	I-Device
of	O
computers	O
.	O
</s>
<s>
The	O
computer	O
was	O
released	O
in	O
several	O
models	O
with	O
different	O
hard	B-Device
disk	I-Device
configurations	O
and	O
in	O
two	O
screen	O
types	O
,	O
a	O
cheaper	O
monochrome	O
version	O
and	O
a	O
more	O
expensive	O
active	O
matrix	O
color	O
version	O
,	O
known	O
as	O
the	O
Compaq	B-Device
Portable	I-Device
486c	I-Device
.	O
</s>
<s>
Both	O
versions	O
are	O
equipped	O
with	O
a	O
socketed	O
Intel	B-General_Concept
80486DX	I-General_Concept
CPU	B-General_Concept
,	O
DRAM	O
(	O
72-pin	O
SIMM	O
)	O
,	O
floppy	B-Device
,	O
(	O
P-ATA	O
)	O
,	O
and	O
SCSI	B-Architecture
port	O
for	O
CD-ROM	B-Device
or	O
tape	B-Architecture
.	O
</s>
<s>
The	O
PC-speaker	O
in	O
the	O
Compaq	O
Portable	O
486	B-General_Concept
is	O
unique	O
in	O
that	O
there	O
is	O
a	O
audio	O
input	O
jack	O
on	O
the	O
side	O
of	O
the	O
unit	O
to	O
allow	O
a	O
third	O
party	O
ISA	B-Architecture
sound	B-Device
card	I-Device
to	O
pass	O
through	O
its	O
audio	O
output	O
to	O
the	O
PC	O
speaker	O
.	O
</s>
<s>
Compaq	O
released	O
two	O
versions	O
of	O
the	O
Compaq	O
Portable	O
486	B-General_Concept
with	O
a	O
faster	O
,	O
Intel	B-Device
80486DX2	I-Device
CPU	B-General_Concept
,	O
named	O
the	O
Compaq	O
Portable	O
486/66	O
for	O
the	O
monochrome	O
version	O
and	O
the	O
Compaq	O
Portable	O
486/66c	O
for	O
the	O
color	O
version	O
.	O
</s>
<s>
Compaq	O
worked	O
with	O
Network	B-Protocol
General	I-Protocol
which	O
released	O
branded	O
versions	O
of	O
the	O
Compaq	O
Portable	O
486	B-General_Concept
as	O
"	O
Network	O
Sniffers	O
"	O
.	O
</s>
