<s>
A	O
Palmtop	B-Device
PC	I-Device
was	O
an	O
approximately	O
pocket	O
calculator-sized	O
,	O
battery-powered	O
computer	O
compatible	O
with	O
the	O
IBM	O
Personal	B-Device
Computer	I-Device
in	O
a	O
horizontal	O
clamshell	O
design	O
with	O
integrated	O
keyboard	O
and	O
display	O
.	O
</s>
<s>
It	O
could	O
be	O
used	O
like	O
a	O
subnotebook	B-Device
,	O
but	O
was	O
light	O
enough	O
to	O
be	O
comfortably	O
used	O
handheld	O
as	O
well	O
.	O
</s>
<s>
Most	O
Palmtop	B-Device
PCs	I-Device
were	O
small	O
enough	O
to	O
be	O
stored	O
in	O
a	O
user	O
's	O
shirt	O
or	O
jacket	O
pocket	O
.	O
</s>
<s>
Palmtop	B-Device
PCs	I-Device
distinguish	O
from	O
other	O
palmtop	B-Operating_System
computers	I-Operating_System
by	O
using	O
a	O
mostly	O
IBM-compatible	O
PC	O
architecture	O
and	O
BIOS	B-Operating_System
as	O
well	O
as	O
an	O
Intel-compatible	B-Operating_System
x86	B-Operating_System
processor	O
.	O
</s>
<s>
All	O
such	O
devices	O
were	O
DOS-based	O
,	O
with	O
DOS	B-Device
stored	O
in	O
ROM	B-Device
.	O
</s>
<s>
While	O
many	O
Palmtop	B-Device
PCs	I-Device
came	O
with	O
a	O
number	O
of	O
PDA	B-Application
and	O
office	O
applications	O
pre-installed	O
in	O
ROM	B-Device
,	O
most	O
of	O
them	O
could	O
also	O
run	O
generic	O
,	O
off-the-shelf	O
PC	O
software	O
with	O
no	O
or	O
little	O
modifications	O
.	O
</s>
<s>
Some	O
could	O
also	O
run	O
other	O
operating	O
systems	O
such	O
as	O
GEOS	B-Application
,	O
Windows	O
1.0-3.0	O
(	O
in	O
Real	B-Application
mode	I-Application
only	O
)	O
,	O
or	O
MINIX	O
2.0	O
.	O
</s>
<s>
Most	O
Palmtop	B-Device
PCs	I-Device
were	O
based	O
on	O
a	O
static	O
hardware	O
design	O
for	O
low	O
power	O
consumption	O
and	O
instant-on/off	O
without	O
the	O
need	O
to	O
reboot	O
.	O
</s>
<s>
Combined	O
with	O
the	O
instant-on/off	O
feature	O
,	O
a	O
battery	O
would	O
typically	O
last	O
from	O
a	O
week	O
up	O
to	O
several	O
months	O
in	O
practical	O
use	O
as	O
PDA	B-Application
.	O
</s>
<s>
The	O
first	O
Palmtop	B-Device
PC	I-Device
was	O
the	O
DIP	B-Device
Pocket	I-Device
PC	I-Device
(	O
aka	O
Atari	B-Device
Portfolio	I-Device
)	O
in	O
1989	O
.	O
</s>
<s>
Palmtop	B-Device
PCs	I-Device
include	O
:	O
</s>
