<s>
Casio	B-Application
Cassiopeia	I-Application
was	O
the	O
brand	O
name	O
of	O
a	O
PDA	B-Application
manufactured	O
by	O
Casio	O
.	O
</s>
<s>
It	O
used	O
Windows	B-Operating_System
CE	I-Operating_System
as	O
the	O
Operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Casio	O
was	O
one	O
of	O
the	O
first	O
manufacturers	O
of	O
PDAs	B-Application
,	O
developing	O
at	O
the	O
beginning	O
small	O
pocket-sized	O
computers	O
with	O
keyboards	B-Device
and	O
grayscale	O
displays	O
and	O
subsequently	O
moving	O
to	O
smaller	O
units	O
in	O
response	O
to	O
customer	O
demand	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
Infrared	O
)	O
(	O
ver	O
.	O
</s>
<s>
The	O
following	O
versions	O
were	O
developed	O
;	O
A21-S	O
for	O
Student	O
,	O
A22-T	O
for	O
Teachers	O
,	O
A-23G	O
for	O
German	O
with	O
AZERTY	O
keyboard	B-Device
,	O
A-20F	O
for	O
French	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
Infrared	O
)	O
(	O
ver	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
The	O
Cassiopeia	O
E-15	O
was	O
the	O
last	O
model	O
of	O
Palm-size	O
PC	O
introduced	O
by	O
Casio	O
that	O
used	O
a	O
grayscale	O
display	B-Device
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
Because	O
of	O
the	O
complaints	O
,	O
Casio	O
offered	O
to	O
update	O
the	O
devices	O
to	O
the	O
newest	O
version	O
of	O
the	O
Operating	B-General_Concept
system	I-General_Concept
if	O
the	O
owners	O
sent	O
in	O
the	O
device	O
and	O
paid	O
a	O
fee	O
.	O
</s>
<s>
Since	O
the	O
operating	B-General_Concept
system	I-General_Concept
was	O
stored	O
in	O
ROM	B-Device
and	O
not	O
flash	O
memory	O
,	O
the	O
only	O
way	O
to	O
upgrade	O
was	O
by	O
replacing	O
the	O
ROM	B-Device
.	O
</s>
<s>
Interface	B-Application
:	O
Serial/USB	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
After	O
using	O
the	O
MIPS	B-Device
processor	O
in	O
the	O
E-15	O
and	O
the	O
E-1xx	O
series	O
devices	O
,	O
the	O
E-200	O
switched	O
over	O
to	O
the	O
StrongARM	B-Device
CPU	B-Device
,	O
in	O
keeping	O
with	O
Microsoft	O
's	O
specifications	O
.	O
</s>
<s>
Interface	B-Application
:	O
Serial/USB	O
and	O
IrDA	O
(	O
ver	O
.	O
</s>
<s>
Some	O
Japanese-only	O
models	O
are	O
the	O
Cassiopeia	O
E-3000	O
,	O
using	O
the	O
PocketPC	B-Operating_System
2002	O
operating	B-General_Concept
system	I-General_Concept
,	O
and	O
the	O
DT-10	O
with	O
Windows	O
Mobile	O
2003	O
.	O
</s>
<s>
E-707	O
Japanese	O
model	O
with	O
wireless/phone	O
antenna	O
and	O
both	O
SD	O
and	O
CF	B-Device
card	I-Device
slots	O
.	O
</s>
<s>
EM-500	O
USA	O
model	O
,	O
slightly	O
smaller	O
than	O
the	O
USA	O
E-1xx	O
with	O
16MB	O
RAM	B-Architecture
and	O
came	O
in	O
multiple	O
colors	O
.	O
</s>
<s>
E-700	O
Japanese	O
version	O
of	O
the	O
EM-500	O
,	O
but	O
with	O
32MB	O
RAM	B-Architecture
and	O
came	O
in	O
many	O
additional	O
colors	O
like	O
white	O
,	O
carbon	O
,	O
silver	O
.	O
</s>
<s>
E-750	O
Japanese	O
successor	O
to	O
the	O
E-1xx	O
series	O
with	O
32MB	O
RAM	B-Architecture
and	O
a	O
200MHz	O
MIPS	B-Device
CPU	B-Device
.	O
</s>
<s>
E-3000/3100	O
Later	O
Japanese	O
model	O
with	O
400MHz	O
XSCALE	B-Application
CPU	B-Device
and	O
CF	B-Device
+	O
SD	O
card	O
slots	O
.	O
</s>
<s>
BE-300	B-Application
Pocket	O
Manager	O
(	O
not	O
a	O
Pocket	O
PC	O
)	O
running	O
on	O
Windows	B-Operating_System
CE	I-Operating_System
3.0	O
with	O
a	O
Casio-designed	O
user	B-Application
interface	I-Application
.	O
</s>
