<s>
The	O
MediaGX	B-Device
CPU	B-Device
is	O
an	O
x86-compatible	O
processor	O
that	O
was	O
designed	O
by	O
Cyrix	O
and	O
manufactured	O
by	O
National	O
Semiconductor	O
following	O
the	O
two	O
companies	O
 '	O
merger	O
.	O
</s>
<s>
The	O
core	O
is	O
based	O
on	O
the	O
integration	O
of	O
the	O
Cyrix	B-Device
Cx5x86	I-Device
CPU	B-Device
core	O
with	O
hardware	O
to	O
process	O
video	O
and	O
audio	O
output	O
(	O
XpressRAM	O
,	O
XpressGRAPHICS	O
,	O
XpressAUDIO	O
)	O
.	O
</s>
<s>
Following	O
the	O
buyout	O
of	O
Cyrix	O
by	O
National	O
Semiconductor	O
and	O
the	O
sale	O
of	O
the	O
Cyrix	O
name	O
and	O
trademarks	O
to	O
VIA	O
Technologies	O
,	O
the	O
core	O
was	O
developed	O
by	O
National	O
Semiconductor	O
into	O
the	O
Geode	B-Device
line	O
of	O
processors	O
,	O
which	O
was	O
subsequently	O
sold	O
to	O
Advanced	O
Micro	O
Devices	O
.	O
</s>
<s>
Whether	O
this	O
processor	O
belongs	O
in	O
the	O
fourth	O
or	O
fifth	O
generation	O
of	O
x86	B-Operating_System
processors	O
can	O
be	O
considered	O
a	O
matter	O
of	O
debate	O
as	O
the	O
processor	O
was	O
based	O
on	O
the	O
5x86	O
(	O
a	O
scaled	O
down	O
version	O
of	O
the	O
Cyrix	B-General_Concept
6x86	I-General_Concept
)	O
.	O
</s>
<s>
While	O
the	O
5x86	O
was	O
intended	O
to	O
compete	O
with	O
the	O
Intel	B-General_Concept
Pentium	I-General_Concept
line	O
,	O
the	O
5th	O
generation	O
x86	B-Operating_System
,	O
it	O
was	O
designed	O
to	O
interface	O
with	O
a	O
4th	O
generation	O
(	O
80486	B-General_Concept
)	O
motherboard	O
and	O
had	O
only	O
the	O
486	B-General_Concept
's	O
instruction	O
set	O
,	O
lacking	O
the	O
ability	O
to	O
run	O
software	O
requiring	O
the	O
Pentium	B-General_Concept
's	O
new	O
instructions	O
.	O
</s>
<s>
The	O
MediaGX	B-Device
CPU	B-Device
was	O
mostly	O
used	O
for	O
subcompact	O
laptops	B-Device
.	O
</s>
<s>
It	O
was	O
also	O
used	O
in	O
the	O
CTX	O
EzBook	O
V92C266	O
,	O
Compaq	B-Device
Presario	I-Device
1220	B-Device
and	O
1230	B-Device
laptops	B-Device
,	O
Compaq	B-Device
Presario	I-Device
2100	O
and	O
2200	B-Device
desktops	O
,	O
Casio	O
Cassiopeia	O
Fiva	O
MPC-100	O
series	O
subnotebook	O
and	O
MPC-501	O
tablet	O
PCs	O
,	O
and	O
many	O
others	O
,	O
as	O
well	O
as	O
in	O
high-performance	O
embedded	O
applications	O
such	O
as	O
the	O
Pinball	B-Application
2000	I-Application
arcade	O
pinball	B-Application
system	O
and	O
Atari	O
Games	O
arcade	O
platforms	O
.	O
</s>
<s>
Sun	O
Microsystems	O
used	O
MediaGXm	O
in	O
the	O
Dover	O
JavaStation	B-Device
.	O
</s>
<s>
The	O
MediaGX	B-Device
was	O
launched	O
on	O
February	O
20	O
,	O
1997	O
.	O
</s>
<s>
Compaq	O
would	O
be	O
using	O
the	O
chip	O
in	O
some	O
of	O
their	O
computers	O
such	O
as	O
the	O
Presario	B-Device
2000	I-Device
,	O
which	O
went	O
on	O
sale	O
for	O
$999	O
.	O
</s>
<s>
The	O
MediaGX	B-Device
was	O
first	O
available	O
in	O
speeds	O
of	O
120	O
and	O
133	O
MHz	O
with	O
pricing	O
of	O
$79	O
and	O
$99	O
.	O
</s>
<s>
This	O
version	O
of	O
the	O
chip	O
would	O
be	O
used	O
in	O
the	O
Presario	B-Device
2120	O
.	O
</s>
<s>
Virtual	O
Subsystem	O
Architecture	O
(	O
VSA	O
)	O
emulates	O
a	O
presence	O
of	O
the	O
real	O
hardware	O
VGA	B-Protocol
(	O
XpressGRAPHICS	O
)	O
and	O
Sound	B-Application
Blaster	I-Application
(	O
XpressAUDIO	O
)	O
.	O
</s>
<s>
The	O
access	O
to	O
the	O
hardware	O
resources	O
traps	O
via	O
BIOS	B-Operating_System
and	O
emulates	O
in	O
the	O
System	B-Architecture
Management	I-Architecture
Mode	I-Architecture
(	O
SMM	O
)	O
,	O
enabling	O
it	O
to	O
execute	O
transparently	O
to	O
the	O
operating	O
system	O
,	O
drivers	O
and	O
applications	O
.	O
</s>
<s>
Cyrix	O
MediaGXi	O
is	O
an	O
improved	O
version	O
of	O
the	O
MediaGX	B-Device
.	O
</s>
<s>
The	O
MediaGXm	O
is	O
an	O
improved	O
MediaGX	B-Device
with	O
an	O
implementation	O
of	O
the	O
MMX	B-Architecture
enhanced	O
instruction	O
set	O
.	O
</s>
<s>
Cache	B-General_Concept
:	O
</s>
<s>
L1	O
cache	B-General_Concept
size	O
16KB	O
write-back	O
4-way	O
set	O
associative	O
unified	O
I/D	O
cache	B-General_Concept
.	O
</s>
<s>
Or	O
12-Kbyte	O
unified	O
L1	O
Cache	B-General_Concept
and	O
4K	O
scratchpad	O
for	O
SMM	O
&	O
Graphics	O
.	O
</s>
<s>
National	O
Semiconductor	O
offered	O
this	O
processor	O
under	O
the	O
name	O
Geode	B-Device
GXM	I-Device
.	O
</s>
<s>
The	O
MediaGX	B-Device
platform	O
does	O
not	O
provide	O
support	O
for	O
external	O
Level-2	O
cache	B-General_Concept
memory	O
,	O
typical	O
for	O
motherboard	O
designs	O
of	O
the	O
period	O
.	O
</s>
<s>
All	O
of	O
the	O
cache	B-General_Concept
must	O
be	O
on	O
the	O
processor	O
die	O
.	O
</s>
<s>
MediaGX	B-Device
processors	O
can	O
only	O
run	O
on	O
motherboards	O
specifically	O
designed	O
for	O
the	O
same	O
model	O
of	O
the	O
processor	O
due	O
to	O
tight	O
integration	O
between	O
the	O
processor	O
and	O
its	O
companion	O
chipset	O
.	O
</s>
