<s>
The	O
PowerBook	B-Device
Duo	I-Device
is	O
a	O
line	O
of	O
subnotebooks	B-Device
manufactured	O
and	O
sold	O
by	O
Apple	O
Computer	O
from	O
1992	O
until	O
1997	O
as	O
a	O
more	O
compact	O
companion	O
to	O
the	O
PowerBook	B-Device
line	O
.	O
</s>
<s>
Improving	O
upon	O
the	O
PowerBook	B-Device
100	I-Device
's	O
portability	O
(	O
its	O
immediate	O
predecessor	O
and	O
Apple	O
's	O
third-smallest	O
laptop	O
)	O
,	O
the	O
Duo	O
came	O
in	O
seven	O
different	O
models	O
.	O
</s>
<s>
They	O
were	O
the	O
Duo	B-Device
210	I-Device
,	O
230	B-Device
,	O
250	O
,	O
270c	O
,	O
280	O
,	O
280c	O
,	O
and	O
2300c	O
,	O
with	O
the	O
210	O
and	O
230	B-Device
being	O
the	O
earliest	O
,	O
and	O
the	O
2300c	O
being	O
the	O
final	O
incarnation	O
before	O
the	O
entire	O
line	O
was	O
dropped	O
in	O
early	O
1997	O
.	O
</s>
<s>
Weighing	O
and	O
slightly	O
smaller	O
than	O
a	O
sheet	O
of	O
paper	O
at	O
,	O
and	O
only	O
thick	O
,	O
it	O
was	O
the	O
lightest	O
and	O
smallest	O
of	O
all	O
of	O
Apple	O
's	O
PowerBooks	B-Device
at	O
the	O
time	O
,	O
and	O
remains	O
one	O
of	O
Apple	O
's	O
smallest	O
notebooks	O
ever	O
produced	O
.	O
</s>
<s>
Only	O
the	O
MacBook	B-Device
Air	I-Device
,	O
the	O
Retina	O
MacBook	O
Pro	O
and	O
the	O
Retina	O
MacBook	O
weigh	O
less	O
,	O
though	O
they	O
are	O
wider	O
and	O
deeper	O
(	O
but	O
considerably	O
thinner	O
)	O
.	O
</s>
<s>
The	O
Duo	O
had	O
the	O
most	O
in	O
common	O
with	O
the	O
original	O
MacBook	B-Device
Air	I-Device
which	O
only	O
included	O
one	O
USB	B-Protocol
2.0	I-Protocol
port	O
,	O
one	O
video	O
port	O
(	O
requiring	O
an	O
adapter	O
)	O
and	O
one	O
speaker	O
port	O
,	O
but	O
no	O
ability	O
for	O
expansion	O
.	O
</s>
<s>
The	O
PowerBook	B-Device
Duo	I-Device
line	O
was	O
replaced	O
by	O
the	O
PowerBook	B-Device
2400	I-Device
,	O
which	O
was	O
slightly	O
larger	O
in	O
size	O
than	O
the	O
Duos	O
,	O
but	O
still	O
only	O
the	O
fifth-smallest	O
behind	O
the	O
12-inch	O
PowerBook	B-Device
G4	O
which	O
succeeded	O
it	O
as	O
fourth-smallest	O
.	O
</s>
<s>
The	O
Duo	O
line	O
offered	O
an	O
ultraportable	B-Device
design	O
that	O
was	O
light	O
and	O
functional	O
for	O
travel	O
and	O
expandable	O
via	O
its	O
unique	O
docking	O
connector	O
.	O
</s>
<s>
Likewise	O
,	O
the	O
trackball	O
was	O
reduced	O
in	O
size	O
from	O
even	O
that	O
used	O
on	O
the	O
PowerBook	B-Device
100	I-Device
.	O
</s>
<s>
The	O
only	O
usable	O
port	O
which	O
came	O
standard	O
on	O
the	O
Duo	O
was	O
a	O
dual	O
printer/modem	O
EIA-422	O
serial	B-Protocol
port	I-Protocol
.	O
</s>
<s>
This	O
somewhat	O
limited	O
configuration	O
meant	O
the	O
only	O
way	O
to	O
move	O
data	O
in	O
or	O
out	O
of	O
the	O
laptop	O
in	O
a	O
stock	O
configuration	O
,	O
without	O
purchasing	O
additional	O
accessories	O
,	O
was	O
via	O
a	O
relatively	O
slow	O
AppleTalk	B-Application
connection	O
,	O
which	O
was	O
not	O
practical	O
in	O
the	O
event	O
of	O
hard	O
drive	O
problems	O
.	O
</s>
<s>
The	O
debut	O
year	O
for	O
the	O
Duo	O
only	O
offered	O
a	O
passive	B-Device
matrix	I-Device
display	O
on	O
both	O
the	O
mid-level	O
and	O
high-end	O
models	O
,	O
in	O
contrast	O
to	O
the	O
high-end	O
of	O
the	O
PowerBook	B-Device
100	I-Device
series	I-Device
-	O
the	O
PowerBook	B-Device
170	I-Device
and	O
180	B-Device
(	O
in	O
which	O
the	O
Duos	O
shared	O
the	O
same	O
processors	O
)	O
.	O
</s>
<s>
With	O
their	O
crisp	O
active	B-General_Concept
matrix	I-General_Concept
displays	O
,	O
both	O
were	O
already	O
in	O
great	O
demand	O
over	O
the	O
lower-powered	O
models	O
with	O
passive	B-Device
matrix	I-Device
displays	O
.	O
</s>
<s>
The	O
following	O
year	O
,	O
Apple	O
replaced	O
the	O
Duo	O
models	O
with	O
both	O
an	O
active	B-General_Concept
matrix	I-General_Concept
display	O
and	O
a	O
color	O
active	B-General_Concept
matrix	I-General_Concept
display	O
,	O
the	O
latter	O
becoming	O
the	O
de	O
facto	O
standard	O
of	O
the	O
PowerBook	B-Device
line	O
.	O
</s>
<s>
The	O
200	O
–	O
series	O
Duos	O
were	O
powered	O
by	O
either	O
Motorola	B-Device
68030	I-Device
or	O
68LC040	B-Device
processors	O
,	O
ranging	O
from	O
25	O
–	O
33MHz	O
.	O
</s>
<s>
When	O
Apple	O
debuted	O
its	O
next-generation	O
PowerPC	B-Architecture
processors	I-Architecture
in	O
1994	O
,	O
it	O
took	O
over	O
a	O
year	O
for	O
the	O
first	O
PowerPC	B-Architecture
Duo	O
(	O
the	O
2300c	O
)	O
to	O
debut	O
.	O
</s>
<s>
The	O
original	O
PowerPC	B-General_Concept
601	I-General_Concept
,	O
like	O
the	O
original	O
68040	B-Device
before	O
it	O
,	O
produced	O
too	O
much	O
heat	O
and	O
consumed	O
too	O
much	O
power	O
for	O
Apple	O
to	O
use	O
in	O
any	O
laptop	O
but	O
,	O
by	O
the	O
end	O
of	O
1995	O
,	O
the	O
more	O
efficient	O
PowerPC	B-General_Concept
603e	I-General_Concept
had	O
been	O
developed	O
,	O
which	O
was	O
featured	O
in	O
the	O
Duo	O
2300c	O
and	O
its	O
full-size	O
companion	O
,	O
the	O
PowerBook	B-Device
5300	I-Device
series	O
.	O
</s>
<s>
The	O
PowerPC	B-General_Concept
603e	I-General_Concept
was	O
designed	O
for	O
a	O
64	O
–	O
bit	O
bus	O
,	O
but	O
was	O
engineered	O
by	O
Apple	O
to	O
run	O
on	O
an	O
older	O
32	O
–	O
bit	O
bus	O
to	O
maintain	O
compatibility	O
with	O
the	O
Duo	O
Docks	O
.	O
</s>
<s>
Models	O
PowerBook	B-Device
Duo	I-Device
210	I-Device
PowerBook	B-Device
Duo	I-Device
230	I-Device
PowerBook	B-Device
Duo	I-Device
250	I-Device
PowerBook	B-Device
Duo	I-Device
270c	I-Device
PowerBook	B-Device
Duo	I-Device
280	I-Device
PowerBook	B-Device
Duo	I-Device
280c	I-Device
PowerBook	B-Device
Duo	I-Device
2300c	I-Device
Timetable	O
Introduced	O
October	O
19	O
,	O
1992	O
October	O
21	O
,	O
1993	O
May	O
16	O
,	O
1994	O
August	O
28	O
,	O
1995	O
Discontinued	O
October	O
21	O
,	O
1993	O
July	O
27	O
,	O
1994	O
May	O
16	O
,	O
1994	O
November	O
14	O
,	O
1994	O
January	O
27	O
,	O
1996	O
February	O
1	O
,	O
1997	O
Ordering	O
info	O
.	O
</s>
<s>
Model	O
M7777	O
Gestalt	O
ID	O
29	O
32	O
38	O
77	O
102	O
103	O
118	O
Order	O
number	O
M4161	O
M4195	O
M1933	O
M1752	O
M2797	O
M2329	O
M4220	O
Display	O
Size	O
9.1	O
"	O
8.4	O
"	O
9.1	O
"	O
8.4	O
"	O
9.5	O
"	O
Colors	O
Grayscale	O
4-bit	O
Color	O
16-bit	O
Grayscale	O
4-bit	O
Color	O
16-bit	O
Color	O
16-bit	O
Method	O
Passive	B-Device
matrix	I-Device
Active	B-General_Concept
matrix	I-General_Concept
Performance	O
Processor	O
Motorola	B-Device
68030	I-Device
Motorola	B-Device
68030	I-Device
with	O
Motorola	B-General_Concept
68882	I-General_Concept
FPU	B-General_Concept
Motorola	O
68LC040	B-Device
PowerPC	B-General_Concept
603e	I-General_Concept
Processor	O
speed	O
25	O
MHz	O
33	O
MHz	O
100	O
MHz	O
RAM( 	O
min.	O
–	O
max	O
.	O
)	O
</s>
<s>
PowerBook	B-Device
Duos	I-Device
lacked	O
most	O
common	O
ports	O
(	O
featuring	O
only	O
one	O
internal	O
printer/modem	O
serial	B-Protocol
port	I-Protocol
and	O
an	O
optional	O
fax/modem	O
card	O
port	O
)	O
.	O
</s>
<s>
In	O
their	O
place	O
was	O
docking	O
ability	O
,	O
accomplished	O
via	O
a	O
unique	O
156-pin	O
Processor	B-Device
Direct	I-Device
Slot	I-Device
(	O
PDS	O
)	O
giving	O
the	O
docks	O
full	O
access	O
to	O
the	O
Duo	O
's	O
central	B-General_Concept
processing	I-General_Concept
unit	I-General_Concept
(	O
CPU	O
)	O
and	O
data	B-General_Concept
buses	I-General_Concept
.	O
</s>
<s>
This	O
was	O
the	O
largest	O
and	O
most	O
expensive	O
dock	O
for	O
the	O
PowerBook	B-Device
Duo	I-Device
,	O
in	O
a	O
form	O
factor	O
common	O
for	O
that	O
period	O
:	O
the	O
Duo	O
Dock	O
(	O
M7779	O
)	O
was	O
first	O
offered	O
by	O
Apple	O
on	O
October	O
19	O
,	O
1992	O
,	O
and	O
the	O
similar	O
docks	O
presented	O
by	O
Compaq	O
(	O
as	O
the	O
LTE	O
Lite	O
Desktop	O
Expansion	O
Base	O
)	O
and	O
IBM	O
(	O
as	O
the	O
3550	O
Expansion	O
Unit	O
)	O
were	O
introduced	O
in	O
the	O
same	O
year	O
.	O
</s>
<s>
Unlike	O
the	O
smaller	O
docks	O
,	O
or	O
"	O
port	B-Device
replicators	I-Device
"	O
that	O
plugged	O
into	O
the	O
back	O
of	O
laptops	O
,	O
the	O
listed	O
docks	O
pulled	O
the	O
laptop	O
inside	O
the	O
dock	O
's	O
metal	O
and	O
plastic	O
case	O
via	O
an	O
internal	O
sliding	O
mechanism	O
(	O
similar	O
to	O
that	O
of	O
a	O
VHS	O
player	O
)	O
.	O
</s>
<s>
The	O
Duo	O
Dock	O
turned	O
the	O
PowerBook	B-Device
Duo	I-Device
into	O
a	O
full-size	O
,	O
AC-powered	O
,	O
fully	O
functional	O
desktop	O
computer	O
with	O
all	O
the	O
standard	O
ports	O
.	O
</s>
<s>
The	O
Duo	O
Dock	O
included	O
a	O
floppy	B-Device
drive	I-Device
on	O
the	O
side	O
,	O
two	O
NuBus	B-Device
expansion	O
slots	O
,	O
an	O
optional	O
floating-point	B-General_Concept
unit	I-General_Concept
(	O
FPU	B-General_Concept
)	O
,	O
level	O
2	O
cache	O
,	O
a	O
slot	O
for	O
more	O
VRAM	O
to	O
enable	O
more	O
colors	O
at	O
higher	O
resolutions	O
,	O
and	O
space	O
for	O
a	O
second	O
hard	O
drive	O
.	O
</s>
<s>
The	O
original	O
Duo	O
Dock	O
was	O
replaced	O
by	O
the	O
Duo	O
Dock	O
II	O
on	O
May	O
16	O
,	O
1994	O
,	O
which	O
added	O
AAUI	B-Protocol
networking	O
and	O
compatibility	O
with	O
the	O
newer	O
color-screen	O
PowerBook	B-Device
Duos	I-Device
.	O
</s>
<s>
The	O
Dock	O
II	O
was	O
followed	O
by	O
the	O
Duo	O
Dock	O
Plus	O
on	O
May	O
15	O
,	O
1995	O
,	O
which	O
was	O
identical	O
to	O
the	O
Duo	O
Dock	O
II	O
,	O
but	O
lacked	O
the	O
FPU	B-General_Concept
and	O
level	O
2	O
cache	O
—	O
which	O
were	O
not	O
compatible	O
with	O
the	O
68LC040-processor	O
Duo	O
280	O
and	O
PowerPC-processor	O
Duo	O
2300c	O
.	O
</s>
<s>
While	O
the	O
laptop	O
's	O
LCD	O
display	O
obviously	O
could	O
not	O
be	O
opened	O
when	O
inside	O
the	O
dock	O
,	O
additional	O
NuBus	B-Device
video	O
cards	O
could	O
be	O
installed	O
to	O
drive	O
up	O
to	O
three	O
monitors	O
.	O
</s>
<s>
The	O
Mini	O
Dock	O
was	O
a	O
port	O
expander	O
for	O
the	O
PowerBook	B-Device
Duo	I-Device
and	O
was	O
popularly	O
offered	O
by	O
many	O
third-party	O
manufacturers	O
and	O
Apple	O
.	O
</s>
<s>
When	O
attached	O
,	O
the	O
PowerBook	B-Device
Duo	I-Device
could	O
be	O
plugged	O
into	O
various	O
standard	O
desktop	O
devices	O
including	O
SCSI	B-Architecture
,	O
Apple	B-Device
Desktop	I-Device
Bus	I-Device
(	O
ADB	O
)	O
,	O
serial	B-Protocol
,	O
floppy	B-Device
disk	I-Device
,	O
external	O
speakers	O
,	O
and	O
an	O
external	O
display	O
.	O
</s>
<s>
The	O
only	O
significant	O
difference	O
between	O
these	O
docks	O
and	O
a	O
full	O
desktop	O
configuration	O
was	O
the	O
lack	O
of	O
custom	O
PDS	O
or	O
NuBus	B-Device
expansion	O
slots	O
,	O
which	O
were	O
included	O
on	O
all	O
standard	O
desktop	O
Macs	O
,	O
a	O
shortfall	O
made	O
up	O
in	O
task-specific	O
third-party	O
dock	O
offerings	O
.	O
</s>
<s>
This	O
type	O
of	O
dock	O
was	O
manufactured	O
by	O
both	O
Apple	O
and	O
many	O
third	O
parties	O
,	O
and	O
gave	O
the	O
PowerBook	B-Device
Duo	I-Device
up	O
to	O
three	O
extra	O
ports	O
in	O
a	O
minimal	O
configuration	O
.	O
</s>
<s>
Examples	O
include	O
floppy	B-Device
,	O
SCSI	B-Architecture
,	O
video	O
and	O
Ethernet	O
docks	O
,	O
each	O
typically	O
included	O
one	O
ADB	B-Device
port	I-Device
as	O
well	O
.	O
</s>
<s>
Drawing	O
heavily	O
upon	O
improvements	O
made	O
to	O
the	O
original	O
PowerBook	B-Device
140	I-Device
design	O
,	O
the	O
Duo	O
series	O
continues	O
many	O
of	O
the	O
styling	O
traits	O
of	O
the	O
PowerBook	B-Device
100	I-Device
,	O
which	O
is	O
approximately	O
equivalent	O
in	O
size	O
and	O
weight	O
.	O
</s>
<s>
The	O
PenLite	O
was	O
an	O
early	O
tablet	B-Device
computer	I-Device
prototyped	O
by	O
Apple	O
Computer	O
in	O
1993	O
around	O
the	O
same	O
time	O
as	O
the	O
Apple	B-Device
Newton	I-Device
.	O
</s>
<s>
The	O
project	O
was	O
canceled	O
in	O
1994	O
due	O
to	O
its	O
similarity	O
to	O
the	O
Newton	B-Device
.	O
</s>
<s>
The	O
PenLite	O
was	O
based	O
on	O
the	O
PowerBook	B-Device
Duo	I-Device
and	O
was	O
meant	O
to	O
be	O
a	O
tablet-style	O
addition	O
,	O
with	O
a	O
stylus	B-Device
as	O
the	O
input	O
device	O
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
be	O
compatible	O
with	O
PowerBook	B-Device
Duo	I-Device
docks	O
and	O
accessories	O
and	O
ran	O
the	O
standard	O
classic	B-Application
Mac	I-Application
OS	I-Application
.	O
</s>
<s>
In	O
the	O
TV	O
sitcom	O
Home	O
Improvement	O
,	O
a	O
Powerbook	B-Device
Duo	I-Device
was	O
used	O
in	O
the	O
fifth	O
episode	O
of	O
season	O
6	O
(	O
Episode	O
#131	O
:	O
Al	O
's	O
Video	O
-	O
Original	O
air	O
date	O
:	O
October	O
15	O
,	O
1996	O
)	O
as	O
Jill	O
's	O
new	O
computer	O
.	O
</s>
<s>
Anne	O
Heche	O
,	O
playing	O
Amy	O
Barnes	O
,	O
a	O
geologist	O
and	O
seismologist	O
,	O
uses	O
a	O
PowerBook	B-Device
Duo	I-Device
280c	I-Device
in	O
the	O
movie	O
Volcano	O
(	O
1997	O
)	O
to	O
calculate	O
the	O
speed	O
of	O
lava	O
flowing	O
beneath	O
the	O
city	O
streets	O
.	O
</s>
<s>
In	O
the	O
film	O
Wag	O
The	O
Dog	O
(	O
1997	O
)	O
,	O
the	O
President	O
's	O
team	O
members	O
,	O
including	O
Anne	O
Heche	O
and	O
Dustin	O
Hoffman	O
among	O
others	O
,	O
use	O
several	O
PowerBook	B-Device
Duo	I-Device
280c	I-Device
.	O
</s>
<s>
In	O
the	O
critically	O
acclaimed	O
TV	O
sitcom	O
NewsRadio	O
(	O
1994-1999	O
)	O
,	O
Dave	O
Nelson	O
used	O
a	O
PowerBook	B-Device
Duo	I-Device
almost	O
exclusively	O
for	O
the	O
first	O
four	O
seasons	O
,	O
the	O
only	O
exceptions	O
being	O
the	O
first	O
few	O
episodes	O
in	O
which	O
he	O
used	O
a	O
PowerBook	B-Device
100	I-Device
series	I-Device
.	O
</s>
<s>
In	O
the	O
fourth	O
season	O
(	O
beginning	O
in	O
1997	O
)	O
,	O
PowerBook	B-Device
Duos	I-Device
were	O
also	O
used	O
prominently	O
by	O
Lisa	O
Miller	O
and	O
occasionally	O
by	O
other	O
characters	O
.	O
</s>
<s>
In	O
the	O
fifth	O
season	O
(	O
beginning	O
in	O
1998	O
)	O
,	O
all	O
computers	O
on	O
the	O
show	O
were	O
replaced	O
with	O
PowerBook	B-Device
G3s	I-Device
and	O
a	O
first-generation	O
iMac	B-Device
.	O
</s>
<s>
A	O
complete	O
PowerBook	B-Device
Duo	I-Device
system	O
,	O
including	O
Dock	O
,	O
is	O
featured	O
prominently	O
throughout	O
seasons	O
five	O
through	O
seven	O
of	O
Seinfeld	O
.	O
</s>
<s>
In	O
the	O
movie	O
Hackers	O
(	O
1995	O
)	O
,	O
Kate	O
Libby	O
owns	O
a	O
PowerBook	B-Device
Duo	I-Device
280c	I-Device
(	O
with	O
a	O
2300c	O
logic	O
board	O
infamously	O
remarked	O
to	O
have	O
a	O
"	O
28.8	O
bps	O
modem	O
"	O
The	O
28.8	O
for	O
the	O
2300	O
was	O
never	O
produced	O
and	O
remained	O
a	O
prototype	O
only	O
)	O
.	O
</s>
<s>
While	O
people	O
believed	O
she	O
was	O
referring	O
to	O
the	O
Intel	O
Pentium	O
Pro	O
,	O
it	O
was	O
actually	O
a	O
PowerPC	B-General_Concept
603e	I-General_Concept
in	O
the	O
2300	O
motherboard	O
(	O
which	O
was	O
referred	O
to	O
by	O
Apple	O
as	O
the	O
"	O
P6	O
"	O
chip	O
for	O
marketing	O
purposes	O
.	O
)	O
</s>
<s>
Denzel	O
Washington	O
,	O
playing	O
Lieutenant	O
Colonel	O
Nathaniel	O
Serling	O
in	O
Courage	O
Under	O
Fire	O
(	O
1996	O
)	O
,	O
drafts	O
a	O
letter	O
using	O
a	O
Powerbook	B-Device
Duo	I-Device
250	I-Device
.	O
</s>
