<s>
It	O
is	O
a	O
development	O
of	O
the	O
earlier	O
Sun-4	B-Device
architecture	O
,	O
using	O
the	O
XDBus	O
system	O
bus	O
,	O
</s>
<s>
SuperSPARC	B-Architecture
processors	O
,	O
and	O
SBus	B-Architecture
I/O	B-General_Concept
cards	O
.	O
</s>
<s>
project	O
,	O
the	O
Xerox	B-Device
Dragon	I-Device
.	O
</s>
<s>
their	O
first	O
attempt	O
at	O
making	O
a	O
mainframe-class	O
server	O
.	O
</s>
<s>
Sun4d	B-Device
computers	O
are	O
true	O
SMP	B-Operating_System
systems	O
;	O
</s>
<s>
All	O
memory	O
and	O
I/O	B-General_Concept
devices	I-General_Concept
are	O
equally	O
connected	O
to	O
all	O
CPUs	O
.	O
</s>
<s>
an	O
I/O	B-General_Concept
bus	O
.	O
</s>
<s>
Cray	B-Device
CS6400	I-Device
(	O
1993	O
)	O
from	O
Cray	O
Research	O
.	O
</s>
<s>
All	O
Sun4d	B-Device
machines	O
provide	O
JTAG	O
ports	O
,	O
although	O
unlike	O
later	O
systems	O
the	O
SPARCcenter	B-Device
and	O
SPARCserver	B-Device
only	O
use	O
it	O
for	O
maintenance	O
purposes	O
.	O
</s>
<s>
The	O
SPARCserver	B-Device
1000	O
is	O
a	O
5U	O
rackmountable	O
chassis	O
with	O
four	O
40	O
MHz	O
XDBus	O
slots	O
,	O
</s>
<s>
front-accessible	O
5.25	O
"	O
SCSI	B-Architecture
drives	O
(	O
typically	O
used	O
for	O
CD-ROM	B-Device
and	O
DAT	B-Architecture
)	O
.	O
</s>
<s>
(	O
four	O
SIMMs	B-General_Concept
apiece	O
)	O
,	O
and	O
builtin	O
SCSI-2	O
,	O
10baseT	O
Ethernet	O
,	O
and	O
two	O
serial	B-Protocol
ports	I-Protocol
.	O
</s>
<s>
The	O
SPARCserver	B-Device
1000E	O
has	O
a	O
slightly	O
faster	O
XDBus	O
(	O
50	O
MHz	O
)	O
.	O
</s>
<s>
The	O
SPARCserver	B-Device
1000	O
,	O
like	O
earlier	O
Sun-4/xxx	O
servers	O
,	O
has	O
a	O
set	O
of	O
LEDs	O
on	O
each	O
system	O
board	O
that	O
display	O
diagnostics	O
on	O
POST	B-Device
,	O
and	O
CPU	O
load	O
while	O
running	O
.	O
</s>
<s>
They	O
are	O
informally	O
referred	O
to	O
as	O
"	O
Cylon	O
"	O
displays	O
,	O
because	O
of	O
the	O
way	O
each	O
displays	O
a	O
single	O
light	O
bouncing	O
back	O
and	O
forth	O
resembles	O
the	O
scanner	O
of	O
the	O
robots	O
in	O
the	O
original	O
Battlestar	B-Application
Galactica	I-Application
television	O
series	O
.	O
</s>
<s>
The	O
SPARCserver	B-Device
1000	O
will	O
run	O
a	O
slightly-patched	O
Linux	B-Application
2.4	O
kernel	O
in	O
SMP	B-Operating_System
mode	O
.	O
</s>
<s>
A	O
single	O
octo-processor	O
SPARCserver	B-Device
1000	O
helped	O
117	O
SPARCstation	B-Architecture
20	I-Architecture
Model	O
HS11	O
units	O
,	O
87	O
with	O
two	O
100	O
MHz	O
hyperSPARC	B-General_Concept
processors	O
and	O
30	O
with	O
four	O
100	O
MHz	O
hyperSPARC	B-General_Concept
processors	O
,	O
to	O
render	O
Toy	B-Application
Story	I-Application
.	O
</s>
<s>
The	O
SPARCcenter	B-Device
2000	O
is	O
a	O
full	O
rack	O
system	O
that	O
includes	O
a	O
main	O
chassis	O
with	O
ten	O
40MHz	O
dual-XDBus	O
slots	O
and	O
several	O
disk	O
arrays	O
.	O
</s>
<s>
The	O
system	O
boards	O
connect	O
to	O
two	O
XDBuses	O
for	O
extra	O
bandwidth	O
,	O
and	O
provide	O
two	O
MBus	B-Architecture
slots	O
,	O
four	O
SBus	B-Architecture
slots	O
,	O
four	O
banks	O
of	O
memory	O
(	O
four	O
SIMMs	B-General_Concept
apiece	O
)	O
,	O
and	O
two	O
serial	B-Protocol
ports	I-Protocol
apiece	O
.	O
</s>
<s>
Unlike	O
the	O
SPARCserver	B-Device
1000	O
boards	O
,	O
they	O
do	O
not	O
have	O
a	O
builtin	O
SCSI	B-Architecture
and	O
Ethernet	O
port	O
per	O
system	O
board	O
.	O
</s>
<s>
The	O
SPARCcenter	B-Device
2000E	O
has	O
a	O
slightly	O
faster	O
XDBus	O
(	O
50	O
MHz	O
)	O
.	O
</s>
<s>
The	O
Cray	B-Device
CS6400	I-Device
is	O
a	O
16-slot	O
,	O
55	O
MHz	O
quad-XDBus	O
system	O
.	O
</s>
<s>
Each	O
system	O
board	O
provides	O
four	O
MBus	B-Architecture
slots	O
,	O
four	O
SBus	B-Architecture
slots	O
,	O
four	O
banks	O
of	O
memory	O
,	O
and	O
no	O
builtin	O
I/O	B-General_Concept
ports	O
.	O
</s>
<s>
When	O
SGI	O
purchased	O
Cray	O
Research	O
in	O
1996	O
,	O
they	O
sold	O
the	O
division	O
responsible	O
for	O
the	O
CS6400	B-Device
to	O
Sun	O
,	O
where	O
it	O
was	O
developed	O
into	O
the	O
extremely	O
successful	O
Sun	B-Device
Enterprise	I-Device
10000	I-Device
.	O
</s>
