<s>
U-boat	B-Operating_System
is	O
a	O
1994	O
computer	O
game	O
developed	O
by	O
American	O
studio	O
Deadly	O
Games	O
for	O
the	O
Macintosh	B-Device
.	O
</s>
<s>
U-boat	B-Operating_System
is	O
a	O
game	O
where	O
the	O
player	O
is	O
on	O
the	O
German	O
side	O
during	O
the	O
dawn	O
of	O
World	O
War	O
II	O
.	O
</s>
<s>
Markus	O
Dahlberg	O
reviewed	O
U-boat	B-Operating_System
for	O
Swedish	O
magazine	O
Datormagazin	O
in	O
1994	O
.	O
</s>
<s>
He	O
felt	O
that	O
players	O
who	O
have	O
a	O
lot	O
of	O
time	O
and	O
are	O
interested	O
in	O
following	O
orders	O
and	O
giving	O
some	O
tactical	O
thinking	O
would	O
find	O
U-boat	B-Operating_System
to	O
be	O
a	O
good	O
investment	O
.	O
</s>
<s>
The	O
game	O
also	O
had	O
a	O
sequel	O
titled	O
U-Boat	B-Operating_System
II	O
:	O
Drumbeat	O
,	O
again	O
only	O
for	O
the	O
Macintosh	B-Device
in	O
1995	O
.	O
</s>
