<s>
The	O
Franklin	O
REX	O
5	O
,	O
(	O
also	O
known	O
as	O
the	O
“	O
Rex-Pro	O
”	O
,	O
as	O
the	O
“	O
Rex	B-Application
5000	I-Application
”	O
,	O
and	O
with	O
cosmetic	O
variation	O
as	O
the	O
“	O
Rex	O
5001	O
”	O
)	O
was	O
one	O
of	O
the	O
Rex	O
line	O
of	O
Personal	B-Application
Digital	I-Application
Assistants	I-Application
,	O
each	O
a	O
PCMCIA	B-Architecture
PC	I-Architecture
card	I-Architecture
and	O
thus	O
the	O
size	O
of	O
a	O
credit	O
card	O
,	O
built	O
around	O
a	O
Toshiba	O
microprocessor	B-Architecture
emulating	O
a	O
Zilog	B-General_Concept
Z80	I-General_Concept
.	O
</s>
<s>
(	O
The	O
later	O
REX	B-Application
6000	I-Application
again	O
had	O
only	O
five	O
buttons	O
,	O
but	O
included	O
a	O
touch	O
screen	O
.	O
)	O
</s>
<s>
Further	O
,	O
with	O
512	O
KB	O
of	O
RAM	B-Architecture
,	O
the	O
Rex	O
5	O
had	O
twice	O
the	O
memory	O
of	O
the	O
Rex-3	O
(	O
which	O
,	O
in	O
turn	O
,	O
had	O
four	O
times	O
that	O
of	O
the	O
original	O
Rex	O
)	O
.	O
</s>
<s>
The	O
REX	B-Application
5000	I-Application
was	O
repackaged	O
by	O
Motorola	O
as	O
the	O
StarTAC	O
ClipOn	O
Organizer	O
,	O
which	O
piggybacked	O
onto	O
digital	O
versions	O
of	O
their	O
popular	O
StarTAC	O
phone	O
(	O
as	O
well	O
as	O
some	O
Timeport	O
models	O
)	O
,	O
expanding	O
the	O
capabilities	O
of	O
the	O
phone	O
from	O
having	O
a	O
capacity	O
of	O
100	O
contacts	O
to	O
1000	O
,	O
and	O
adding	O
calendar	O
and	O
note	O
functionality	O
.	O
</s>
<s>
The	O
REX	B-Application
5000	I-Application
and	O
StarTAC	O
ClipOn	O
Organizer	O
,	O
like	O
earlier	O
models	O
of	O
the	O
Rex	O
,	O
utilized	O
Starfish	O
Software	O
's	O
TrueSync	O
for	O
data	O
synchronization	O
.	O
</s>
<s>
The	O
REX	B-Application
5000	I-Application
was	O
succeeded	O
by	O
the	O
Xircom	O
REX	B-Application
6000	I-Application
.	O
</s>
