<s>
Callisto	B-Application
Corporation	I-Application
was	O
a	O
software	O
development	O
company	O
founded	O
by	O
Robert	O
Harris	O
,	O
Mike	O
Barta	O
and	O
Seth	O
Lipkin	O
in	O
May	O
1989	O
.	O
</s>
<s>
They	O
were	O
best	O
known	O
for	O
their	O
series	O
of	O
computer	O
games	O
for	O
the	O
Macintosh	B-Device
in	O
the	O
1990s	O
,	O
including	O
ClockWerx	B-Application
,	O
Spin	O
Doctor	O
,	O
Super	O
Maze	O
Wars	O
and	O
Super	O
Mines	O
.	O
</s>
<s>
They	O
also	O
were	O
contracted	O
out	O
to	O
work	O
on	O
the	O
software	O
titles	O
Math	B-Application
Blaster	I-Application
,	O
Reading	B-Application
Blaster	I-Application
,	O
and	O
Typing	O
Tutor	O
.	O
</s>
<s>
From	O
1990	O
to	O
1992	O
,	O
they	O
created	O
and	O
expanded	O
Meeting	B-Application
Maker	I-Application
,	O
a	O
networked	O
meeting-scheduling	O
product	O
.	O
</s>
<s>
In	O
1991	O
,	O
Callisto	O
sold	O
Meeting	B-Application
Maker	I-Application
to	O
ON	O
Technology	O
.	O
</s>
