<s>
The	O
Transmeta	B-General_Concept
Crusoe	I-General_Concept
is	O
a	O
family	O
of	O
x86-compatible	O
microprocessors	B-Architecture
developed	O
by	O
Transmeta	O
and	O
introduced	O
in	O
2000	O
.	O
</s>
<s>
Instead	O
of	O
the	O
instruction	B-General_Concept
set	I-General_Concept
architecture	I-General_Concept
being	O
implemented	O
in	O
hardware	O
,	O
or	O
translated	O
by	O
specialized	O
hardware	O
,	O
the	O
Crusoe	O
runs	O
a	O
software	O
abstraction	O
layer	O
,	O
or	O
a	O
virtual	B-Architecture
machine	I-Architecture
,	O
known	O
as	O
the	O
Code	B-Application
Morphing	I-Application
Software	I-Application
(	O
CMS	O
)	O
.	O
</s>
<s>
The	O
CMS	O
translates	O
machine	B-Language
code	I-Language
instructions	O
received	O
from	O
programs	O
into	O
native	O
instructions	O
for	O
the	O
microprocessor	B-Architecture
.	O
</s>
<s>
In	O
this	O
way	O
,	O
the	O
Crusoe	O
can	O
emulate	B-Application
other	O
instruction	B-General_Concept
set	I-General_Concept
architectures	I-General_Concept
(	O
ISAs	O
)	O
.	O
</s>
<s>
This	O
is	O
used	O
to	O
allow	O
the	O
microprocessors	B-Architecture
to	O
emulate	B-Application
the	O
Intel	B-Operating_System
x86	I-Operating_System
instruction	B-General_Concept
set	I-General_Concept
.	O
</s>
<s>
The	O
Crusoe	O
was	O
notable	O
for	O
its	O
method	O
of	O
achieving	O
x86	B-Operating_System
compatibility	O
.	O
</s>
<s>
Instead	O
of	O
the	O
instruction	B-General_Concept
set	I-General_Concept
architecture	I-General_Concept
being	O
implemented	O
in	O
hardware	O
,	O
or	O
translated	O
by	O
specialized	O
hardware	O
,	O
the	O
Crusoe	O
runs	O
a	O
software	O
abstraction	O
layer	O
,	O
or	O
a	O
virtual	B-Architecture
machine	I-Architecture
,	O
known	O
as	O
the	O
Code	B-Application
Morphing	I-Application
Software	I-Application
(	O
CMS	O
)	O
.	O
</s>
<s>
The	O
CMS	O
translates	O
machine	B-Language
code	I-Language
instructions	O
received	O
from	O
programs	O
into	O
native	O
instructions	O
for	O
the	O
microprocessor	B-Architecture
.	O
</s>
<s>
In	O
this	O
way	O
,	O
the	O
Crusoe	O
can	O
emulate	B-Application
other	O
instruction	B-General_Concept
set	I-General_Concept
architectures	I-General_Concept
(	O
ISAs	O
)	O
.	O
</s>
<s>
This	O
is	O
used	O
to	O
allow	O
the	O
microprocessors	B-Architecture
to	O
emulate	B-Application
the	O
Intel	B-Operating_System
x86	I-Operating_System
instruction	B-General_Concept
set	I-General_Concept
.	O
</s>
<s>
In	O
theory	O
,	O
it	O
is	O
possible	O
for	O
the	O
CMS	O
to	O
be	O
modified	O
to	O
emulate	B-Application
other	O
ISAs	O
.	O
</s>
<s>
Transmeta	O
demonstrated	O
Crusoe	O
executing	O
Java	B-Language
bytecode	I-Language
by	O
translating	O
the	O
bytecodes	O
into	O
instructions	O
in	O
its	O
native	O
instruction	B-General_Concept
set	I-General_Concept
.	O
</s>
<s>
The	O
addition	O
of	O
an	O
abstraction	O
layer	O
between	O
the	O
x86	B-Operating_System
instruction	O
stream	O
and	O
the	O
hardware	O
means	O
that	O
the	O
hardware	O
architecture	O
can	O
change	O
without	O
breaking	O
compatibility	O
,	O
just	O
by	O
modifying	O
the	O
CMS	O
.	O
</s>
<s>
For	O
example	O
,	O
Transmeta	B-General_Concept
Efficeon	I-General_Concept
—	O
a	O
second-generation	O
Transmeta	O
design	O
—	O
has	O
a	O
256-bit-wide	O
VLIW	B-General_Concept
core	O
versus	O
the	O
128-bit	O
core	O
of	O
the	O
Crusoe	O
.	O
</s>
<s>
Efficeon	B-General_Concept
also	O
supports	O
SSE	B-General_Concept
instructions	I-General_Concept
.	O
</s>
<s>
The	O
Crusoe	O
is	O
a	O
VLIW	B-General_Concept
microprocessor	B-Architecture
that	O
executes	O
bundles	O
of	O
instructions	O
,	O
termed	O
molecules	O
by	O
Transmeta	O
.	O
</s>
<s>
The	O
Code	B-Application
Morphing	I-Application
Software	I-Application
translates	O
x86	B-Device
instructions	I-Device
into	O
native	O
instructions	O
.	O
</s>
<s>
In	O
the	O
event	O
that	O
there	O
are	O
not	O
enough	O
instructions	O
to	O
fill	O
a	O
molecule	O
,	O
the	O
software	O
inserts	O
NOPs	B-Language
as	O
padding	O
to	O
fill	O
out	O
empty	O
slots	O
.	O
</s>
<s>
This	O
is	O
required	O
in	O
all	O
VLIW	B-General_Concept
architectures	O
and	O
is	O
criticised	O
for	O
being	O
inefficient	O
,	O
which	O
is	O
why	O
there	O
are	O
molecules	O
of	O
two	O
separate	O
lengths	O
.	O
</s>
<s>
instruction	O
re-ordering	O
)	O
,	O
resulting	O
in	O
simpler	O
hardware	O
with	O
fewer	O
transistors	B-Application
.	O
</s>
<s>
The	O
relative	O
simplicity	O
of	O
the	O
hardware	O
means	O
that	O
Crusoe	O
consumes	O
less	O
power	O
(	O
and	O
therefore	O
generates	O
less	O
heat	O
)	O
than	O
other	O
x86-compatible	O
microprocessors	B-Architecture
running	O
at	O
the	O
same	O
frequency	O
.	O
</s>
<s>
A	O
700MHz	O
Crusoe	O
ran	O
x86	B-Operating_System
programs	O
at	O
the	O
speed	O
of	O
a	O
500MHz	O
Pentium	O
III	O
x86	B-Operating_System
processor	O
,	O
although	O
the	O
Crusoe	O
processor	O
was	O
smaller	O
and	O
cheaper	O
than	O
the	O
corresponding	O
Intel	O
processor	O
.	O
</s>
<s>
The	O
TM3200	O
has	O
an	O
integrated	B-General_Concept
memory	I-General_Concept
controller	I-General_Concept
supports	O
only	O
SDRAM	O
and	O
a	O
PCI	B-Protocol
interface	O
.	O
</s>
<s>
The	O
integrated	B-General_Concept
memory	I-General_Concept
controller	I-General_Concept
supports	O
both	O
SDRAM	O
and	O
DDR	O
SDRAM	O
.	O
</s>
<s>
It	O
also	O
has	O
a	O
PCI	B-Protocol
interface	O
.	O
</s>
<s>
Transmeta	O
was	O
a	O
fabless	B-Algorithm
semiconductor	I-Algorithm
company	I-Algorithm
,	O
without	O
the	O
facilities	O
to	O
fabricate	O
their	O
designs	O
.	O
</s>
<s>
The	O
Crusoe	O
processor	O
supports	O
MMX	B-Architecture
but	O
not	O
SSE	B-General_Concept
.	O
</s>
<s>
As	O
of	O
2022	O
,	O
most	O
browsers	O
on	O
Windows	O
and	O
Linux	O
,	O
and	O
some	O
other	O
programs	O
,	O
need	O
SSE	B-General_Concept
or	O
SSE2	B-General_Concept
support	O
;	O
therefore	O
,	O
that	O
software	O
will	O
no	O
longer	O
run	O
on	O
the	O
Crusoe	O
platform	O
.	O
</s>
<s>
For	O
example	O
,	O
Firefox	B-Application
dropped	O
support	O
for	O
systems	O
without	O
SSE2	B-General_Concept
in	O
2017	O
,	O
although	O
K-Meleon	B-Protocol
could	O
run	O
without	O
SSE	B-General_Concept
on	O
Windows	O
XP	O
.	O
</s>
<s>
The	O
Efficeon	B-General_Concept
processor	O
added	O
support	O
for	O
SSE	B-General_Concept
and	O
SSE2	B-General_Concept
.	O
</s>
