<s>
This	O
list	B-Device
of	I-Device
computer	I-Device
size	I-Device
categories	I-Device
attempts	O
to	O
list	O
commonly	O
used	O
categories	O
of	O
computer	O
by	O
the	O
physical	O
size	O
of	O
the	O
device	O
and	O
its	O
chassis	O
or	O
case	O
,	O
in	O
descending	O
order	O
of	O
size	O
.	O
</s>
<s>
One	O
generation	O
's	O
"	O
supercomputer	B-Architecture
"	O
is	O
the	O
next	O
generation	O
's	O
"	O
mainframe	B-Architecture
"	O
,	O
and	O
a	O
"	O
PDA	B-Application
"	O
does	O
not	O
have	O
the	O
same	O
set	O
of	O
functions	O
as	O
a	O
"	O
laptop	B-Device
"	O
,	O
but	O
the	O
list	O
still	O
has	O
value	O
,	O
as	O
it	O
provides	O
a	O
ranked	O
categorization	O
of	O
devices	O
.	O
</s>
<s>
It	O
also	O
ranks	O
some	O
more	O
obscure	O
computer	B-Device
sizes	I-Device
.	O
</s>
<s>
There	O
are	O
different	O
sizes	O
like-mini	O
computers	O
,	O
microcomputer	B-Architecture
,	O
mainframe	B-Architecture
computer	I-Architecture
and	O
super	B-Architecture
computer	I-Architecture
.	O
</s>
<s>
Handheld	B-Application
computers	I-Application
,	O
which	O
include	O
the	O
classes	O
:	O
</s>
<s>
Personal	B-Application
digital	I-Application
assistant	I-Application
or	O
enterprise	B-Application
digital	I-Application
assistant	I-Application
,	O
which	O
include	O
:	O
</s>
<s>
Calculator	B-Application
,	O
which	O
includes	O
the	O
class	O
:	O
</s>
<s>
Small	B-Device
form	I-Device
factor	I-Device
personal	I-Device
computer	I-Device
(	O
SFF	O
,	O
ITX	O
,	O
DTX.etc	O
.	O
)	O
</s>
<s>
For	O
instance	O
,	O
the	O
"	O
subnotebook	B-Device
"	O
category	O
can	O
usually	O
be	O
distinguished	O
from	O
the	O
"	O
PDA	B-Application
"	O
category	O
because	O
a	O
subnotebook	B-Device
has	O
a	O
keyboard	O
and	O
a	O
PDA	B-Application
has	O
not	O
;	O
however	O
,	O
tablet	B-Device
PCs	I-Device
may	O
be	O
larger	O
than	O
subnotebooks	B-Device
(	O
making	O
it	O
seemingly	O
correct	O
to	O
classify	O
them	O
as	O
laptops	B-Device
)	O
and	O
also	O
lack	O
a	O
keyboard	O
,	O
while	O
devices	O
such	O
as	O
the	O
Handspring	B-Application
Treo	I-Application
600	I-Application
have	O
something	O
that	O
might	O
charitably	O
be	O
called	O
a	O
keyboard	O
,	O
but	O
are	O
still	O
definitely	O
in	O
the	O
"	O
smartphone	B-Application
"	O
category	O
.	O
</s>
