<s>
The	O
Sega	B-Operating_System
SG-1000	I-Operating_System
had	O
74	O
games	O
and	O
29	O
programs	O
released	O
.	O
</s>
<s>
Because	O
there	O
is	O
no	O
card	O
slot	O
on	O
the	O
SG-1000/SC	O
-3000	O
series	O
,	O
or	O
the	O
Mark	O
II	O
it	O
is	O
a	O
necessary	O
adapter	O
(	O
a	O
card	O
slot	O
is	O
built	O
into	O
the	O
SEGA	O
Mark	O
III/Master	O
System	O
)	O
.	O
</s>
<s>
The	O
Othello	O
Multivision	O
is	O
a	O
licensed	O
clone	O
of	O
the	O
SG-1000	B-Operating_System
,	O
manufactured	O
by	O
Tsukuda	O
Original	O
and	O
fully	O
compatible	O
with	O
the	O
SG-1000	B-Operating_System
.	O
</s>
