<s>
The	O
SPARCstation	B-Architecture
2	I-Architecture
,	O
or	O
SS2	O
(	O
code	O
named	O
Calvin	O
,	O
Sun	O
4/75	O
)	O
is	O
a	O
SPARC	B-Architecture
workstation	B-Device
computer	I-Device
sold	O
by	O
Sun	O
Microsystems	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
sun4c	O
architecture	O
,	O
and	O
is	O
implemented	O
in	O
a	O
pizza	B-General_Concept
box	I-General_Concept
form	I-General_Concept
factor	I-General_Concept
.	O
</s>
<s>
The	O
only	O
known	O
CPU	O
upgrade	O
option	O
was	O
the	O
Weitek	O
80MHz	O
"	O
SPARC	B-Architecture
POWER	O
μP	O
"	O
(	O
power-up	O
)	O
.	O
</s>
<s>
The	O
SPARCstation	B-Architecture
2	I-Architecture
can	O
be	O
configured	O
with	O
up	O
to	O
128	O
MB	O
of	O
memory	O
in	O
total	O
:	O
64	O
MB	O
on	O
the	O
motherboard	O
,	O
and	O
an	O
additional	O
64	O
MB	O
using	O
a	O
special	O
32	O
MB	O
SBus	B-Architecture
memory	O
card	O
with	O
another	O
32	O
MB	O
piggy-backed	O
daughterboard	O
.	O
</s>
<s>
The	O
16	O
RAM	O
slots	O
on	O
the	O
motherboard	O
can	O
be	O
populated	O
with	O
either	O
1	O
MB	O
SIMMs	B-General_Concept
for	O
a	O
total	O
of	O
16	O
MB	O
,	O
or	O
with	O
4	O
MB	O
SIMMs	B-General_Concept
for	O
a	O
total	O
of	O
64	O
MB	O
.	O
</s>
<s>
Standard	O
30-pin	O
SIMMs	B-General_Concept
can	O
be	O
used	O
as	O
long	O
as	O
they	O
use	O
parity	B-Error_Name
error	I-Error_Name
detection	I-Error_Name
and	O
are	O
rated	O
80	O
ns	O
or	O
faster	O
.	O
</s>
<s>
The	O
SPARCstation	B-Architecture
2	I-Architecture
uses	O
a	O
standard	O
50-pin	O
SCSI	B-Architecture
interface	O
and	O
can	O
house	O
two	O
3	O
1/2	O
"	O
full-height	O
disk	B-Device
drives	I-Device
.	O
</s>
<s>
The	O
SS2	O
also	O
comes	O
with	O
a	O
special	O
auto-ejecting	O
1.44	O
MB	O
floppy	B-Device
disk	I-Device
drive	I-Device
.	O
</s>
<s>
Modern	O
80-pin	O
Single	O
Connector	O
Attachment	O
(	O
SCA	O
)	O
SCSI	B-Architecture
drives	O
can	O
be	O
used	O
internally	O
with	O
an	O
adapter	O
,	O
but	O
the	O
plastic	O
drive	O
sled	O
used	O
with	O
50-pin	O
drives	O
must	O
be	O
cut	O
to	O
allow	O
clearance	O
for	O
the	O
adapter	O
board	O
.	O
</s>
<s>
SCA	O
drives	O
may	O
run	O
hotter	O
than	O
original	O
SCSI	B-Architecture
drives	O
and	O
cause	O
heating	O
issues	O
,	O
especially	O
if	O
two	O
drives	O
are	O
installed	O
.	O
</s>
<s>
There	O
is	O
an	O
Ethernet	O
AUI	B-Protocol
port	I-Protocol
on	O
board	O
,	O
which	O
can	O
be	O
supplemented	O
by	O
add-on	O
SBus	B-Architecture
cards	O
.	O
</s>
<s>
External	O
AUI	B-Protocol
transceivers	O
are	O
required	O
for	O
connection	O
to	O
10BASE5	O
,	O
10BASE2	O
,	O
10BASE-T	B-Protocol
,	O
or	O
other	O
Ethernet	O
physical	B-Application
layer	I-Application
media	O
.	O
</s>
<s>
The	O
SPARCstation	B-Architecture
2	I-Architecture
uses	O
an	O
M48T02	O
battery-backed	O
RTC	O
with	O
RAM	O
chip	O
which	O
handles	O
the	O
real	O
time	O
clock	O
and	O
boot	O
parameter	O
storage	O
.	O
</s>
<s>
The	O
following	O
operating	O
systems	O
will	O
run	O
on	O
a	O
SPARCstation	B-Architecture
2	I-Architecture
:	O
</s>
<s>
Linux	B-Application
-	O
Some	O
,	O
but	O
not	O
all	O
,	O
distributions	O
supported	O
this	O
sparc32	O
sub-architecture	O
;	O
it	O
had	O
support	O
in	O
Debian	O
from	O
Debian	O
2.1	O
(	O
March	O
1999	O
)	O
through	O
Debian	O
4.0	O
(	O
etch	O
)	O
,	O
last	O
updated	O
in	O
May	O
2010	O
.	O
</s>
