<s>
The	O
Mattel	O
Children	B-Device
's	I-Device
Discovery	I-Device
System	I-Device
is	O
an	O
early	O
electronic	O
educational	O
toy	O
product	O
released	O
by	O
Mattel	O
in	O
1981	O
.	O
</s>
<s>
The	O
Children	B-Device
's	I-Device
Discovery	I-Device
System	I-Device
was	O
targeted	O
toward	O
children	O
aged	O
6	O
to	O
11	O
and	O
mimicked	O
the	O
look	O
of	O
a	O
contemporary	O
consumer-grade	O
computer	B-Architecture
.	O
</s>
<s>
The	O
art	O
mode	O
,	O
however	O
,	O
was	O
praised	O
for	O
being	O
a	O
good	O
introduction	O
to	O
computer	B-Architecture
graphics	O
,	O
although	O
the	O
process	O
of	O
drawing	O
pixel-by-pixel	O
was	O
described	O
as	O
tedious	O
.	O
</s>
<s>
The	O
Children	B-Device
's	I-Device
Discovery	I-Device
System	I-Device
used	O
a	O
16-by-48	O
matrix	O
LCD	B-Device
screen	I-Device
and	O
was	O
powered	O
by	O
six	O
size	O
AA	B-Algorithm
alkaline	B-Algorithm
batteries	I-Algorithm
.	O
</s>
<s>
The	O
Discovery	O
System	O
came	O
with	O
a	O
specially	O
laid-out	O
membrane	B-Device
keyboard	I-Device
to	O
better	O
accommodate	O
the	O
built-in	O
modes	O
and	O
also	O
made	O
use	O
of	O
keyboard	O
overlays	O
for	O
use	O
with	O
expansion	O
modules	O
.	O
</s>
<s>
Besides	O
the	O
three	O
included	O
modes	O
on	O
the	O
console	O
,	O
one	O
could	O
buy	O
other	O
game	B-Protocol
cartridges	I-Protocol
with	O
different	O
games	O
.	O
</s>
<s>
Each	O
cartridge	B-Protocol
is	O
numbered	O
from	O
1	O
to	O
21	O
,	O
and	O
all	O
have	O
the	O
Discoveries	O
in	O
----	O
Learning	O
Fun	O
Module	O
name	O
,	O
where	O
the	O
----	O
is	O
the	O
name	O
of	O
the	O
actual	O
game	O
and	O
what	O
is	O
written	O
on	O
the	O
cartridge	B-Protocol
.	O
</s>
<s>
7	O
3731	O
6	O
–	O
11	O
Arcade	O
Action	O
II	O
Target	O
action	O
excitement	O
in	O
4	O
computer	B-Architecture
arcade	O
games	O
.	O
</s>
