<s>
BeebEm	B-Operating_System
is	O
a	O
BBC	B-Device
Micro	I-Device
emulator	B-Application
,	O
first	O
developed	O
by	O
David	O
Gilbert	O
in	O
1994	O
and	O
since	O
improved	O
by	O
a	O
number	O
of	O
people	O
,	O
most	O
notably	O
Mike	O
Wyatt	O
who	O
currently	O
maintains	O
the	O
emulator	B-Application
and	O
its	O
website	O
.	O
</s>
<s>
Although	O
BeebEm	B-Operating_System
's	O
first	O
incarnations	O
were	O
for	O
UNIX-based	O
systems	O
,	O
the	O
version	O
for	O
Windows	B-Application
(	O
98	B-Device
or	O
later	O
)	O
is	O
now	O
the	O
most	O
popular	O
.	O
</s>
<s>
BeebEm	B-Operating_System
is	O
also	O
available	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
Agenda	B-Application
VR3	I-Application
and	O
Pocket	B-Device
PC	I-Device
.	O
</s>
<s>
BeebEm	B-Operating_System
is	O
copyrighted	O
freeware	B-License
,	O
and	O
its	O
source	O
code	O
is	O
distributed	O
with	O
the	O
emulator	B-Application
under	O
the	O
GPL	B-License
licence	O
.	O
</s>
<s>
As	O
of	O
version	O
4.13	O
(	O
January	O
2011	O
)	O
,	O
BeebEm	B-Operating_System
for	O
Windows	B-Application
emulates	B-Application
the	O
following	O
hardware	O
:	O
</s>
<s>
The	O
TMS5220	O
Speech	O
Generator	O
emulator	B-Application
was	O
removed	O
from	O
version	O
4.1	O
onwards	O
due	O
to	O
licensing	O
issues	O
.	O
</s>
<s>
BeebEm	B-Operating_System
can	O
read	O
images	O
from	O
files	O
representing	O
tape	O
(	O
in	O
UEF	O
format	O
)	O
,	O
DFS	B-Application
or	O
ADFS	B-Device
discs	O
,	O
ROM	O
cartridges	O
and	O
SCSI	B-Architecture
or	O
SASI	O
hard	B-Device
disks	I-Device
.	O
</s>
<s>
It	O
is	O
capable	O
of	O
running	O
the	O
vast	O
majority	O
of	O
BBC	B-Device
Micro	I-Device
software	O
,	O
including	O
classics	O
such	O
as	O
Elite	B-Application
,	O
Exile	B-Application
and	O
Firetrack	B-Application
.	O
</s>
<s>
Jon	O
Welch	O
,	O
who	O
maintains	O
the	O
Mac	O
port	O
of	O
BeebEm	B-Operating_System
,	O
has	O
shown	O
a	O
preview	O
of	O
BeebEm	B-Operating_System
(	O
the	O
Windows	B-Application
version	O
)	O
emulating	B-Application
the	O
Master	O
512	O
computer	O
,	O
including	O
the	O
GEM	B-Application
windowing	I-Application
system	I-Application
.	O
</s>
