<s>
The	O
Sun-2	B-Device
series	O
of	O
UNIX	B-Device
workstations	I-Device
and	O
servers	O
was	O
launched	O
by	O
Sun	O
Microsystems	O
in	O
November	O
1983	O
.	O
</s>
<s>
As	O
the	O
name	O
suggests	O
,	O
the	O
Sun-2	B-Device
represented	O
the	O
second	O
generation	O
of	O
Sun	O
systems	O
,	O
superseding	O
the	O
original	O
Sun-1	B-Device
series	O
.	O
</s>
<s>
The	O
Sun-2	B-Device
series	O
used	O
a	O
10MHz	O
Motorola	B-Device
68010	I-Device
microprocessor	B-Architecture
with	O
a	O
proprietary	O
Sun-2	B-Device
Memory	B-General_Concept
Management	I-General_Concept
Unit	I-General_Concept
(	O
MMU	O
)	O
,	O
which	O
enabled	O
it	O
to	O
be	O
the	O
first	O
Sun	O
architecture	O
to	O
run	O
a	O
full	O
virtual	B-Architecture
memory	I-Architecture
UNIX	B-Application
implementation	O
,	O
SunOS	B-Operating_System
1.0	O
,	O
based	O
on	O
4.1BSD	B-Operating_System
.	O
</s>
<s>
Early	O
Sun-2	B-Device
models	O
were	O
based	O
on	O
the	O
Intel	O
Multibus	B-Protocol
architecture	O
,	O
with	O
later	O
models	O
using	O
VMEbus	B-Architecture
,	O
which	O
continued	O
to	O
be	O
used	O
in	O
the	O
successor	O
Sun-3	B-Device
and	O
Sun-4	B-Device
families	O
.	O
</s>
<s>
Sun-2	B-Device
systems	O
were	O
supported	O
in	O
SunOS	B-Operating_System
until	O
version	O
4.0.3	O
.	O
</s>
<s>
A	O
port	O
to	O
support	O
Multibus	B-Protocol
Sun-2	B-Device
systems	O
in	O
NetBSD	B-Device
was	O
begun	O
in	O
January	O
2001	O
from	O
the	O
Sun-3	B-Device
support	O
in	O
the	O
NetBSD	B-Device
1.5	O
release	O
.	O
</s>
<s>
Code	O
supporting	O
the	O
Sun-2	B-Device
began	O
to	O
be	O
merged	O
into	O
the	O
NetBSD	B-Device
tree	O
in	O
April	O
2001	O
.	O
sun2	B-Device
is	O
considered	O
a	O
tier	O
2	O
support	O
platform	O
as	O
of	O
NetBSD	B-Device
7.0.1	O
.	O
</s>
<s>
A	O
desktop	O
disk	O
and	O
tape	O
sub-system	O
was	O
introduced	O
for	O
the	O
Sun-2/50	O
desktop	O
workstation	B-Device
.	O
</s>
<s>
It	O
used	O
DD-50	B-Protocol
(	O
sometimes	O
erroneously	O
referred	O
to	O
as	O
DB-50	O
)	O
connectors	O
for	O
its	O
SCSI	B-Architecture
cables	O
,	O
a	O
Sun	O
specific	O
design	O
.	O
</s>
<s>
Sun-1	B-Device
systems	O
upgraded	O
with	O
Sun-2	B-Device
Multibus	B-Protocol
CPU	O
boards	O
were	O
sometimes	O
referred	O
to	O
as	O
the	O
2/100U	O
(	O
upgraded	O
Sun-100	O
)	O
or	O
2/150U	O
(	O
upgraded	O
Sun-150	O
)	O
.	O
</s>
<s>
A	O
typical	O
configuration	O
of	O
a	O
monochrome	O
2/120	O
with	O
4	O
MB	O
of	O
memory	O
,	O
71	O
MB	O
SCSI	B-Architecture
disk	O
and	O
20	O
MB	O
1/4	O
"	O
SCSI	B-Architecture
tape	O
cost	O
$	O
29,300	O
(	O
1986	O
US	O
price	O
list	O
)	O
.	O
</s>
<s>
A	O
color	O
2/160	O
with	O
8	O
MB	O
of	O
memory	O
,	O
two	O
71	O
MB	O
SCSI	B-Architecture
disks	O
and	O
60	O
MB	O
1/4	O
"	O
SCSI	B-Architecture
tape	O
cost	O
$	O
48,800	O
(	O
1986	O
US	O
price	O
list	O
)	O
.	O
</s>
<s>
A	O
Sun	O
2/170	O
server	B-Application
with	O
4	O
MB	O
of	O
memory	O
,	O
no	O
display	O
,	O
two	O
Fujitu	O
Eagle	O
380	O
MB	O
disk	O
drive	O
,	O
one	O
Xylogics	B-Architecture
450	O
SMD	B-Architecture
disk	O
controller	O
,	O
a	O
6250	O
bpi	O
1/2	O
inch	O
tape	O
drive	O
and	O
a	O
72	O
"	O
rack	O
cost	O
$	O
79,500	O
(	O
1986	O
US	O
price	O
list	O
)	O
.	O
</s>
<s>
Sun	O
2/120	O
(	O
9	O
slot	O
deskside	O
)	O
and	O
2/170	O
(	O
15	O
slot	O
rackmount	O
)	O
systems	O
were	O
based	O
on	O
the	O
Multibus	B-Protocol
architecture	O
.	O
</s>
<s>
The	O
CPU	O
board	O
was	O
based	O
on	O
a	O
10MHz	O
68010	B-Device
processor	O
with	O
a	O
proprietary	O
Sun	O
Memory	B-General_Concept
Management	I-General_Concept
Unit	I-General_Concept
(	O
MMU	O
)	O
and	O
could	O
address	O
8	O
MB	O
of	O
physical	O
and	O
16	O
MB	O
of	O
virtual	B-Architecture
memory	I-Architecture
.	O
</s>
<s>
The	O
Multibus	B-Protocol
CPU	O
board	O
supported	O
the	O
Sun-1	B-Device
parallel	O
keyboard	O
and	O
mouse	O
as	O
well	O
as	O
two	O
serial	O
ports	O
.	O
</s>
<s>
The	O
Sun	O
2/50	O
(	O
2	O
slot	O
desktop	O
)	O
,	O
Sun	O
2/130	O
(	O
12	O
slot	O
monochrome	O
deskside	O
)	O
and	O
Sun	O
2/160	O
(	O
12	O
slot	O
color	O
deskside	O
)	O
used	O
quad-depth	O
,	O
triple	O
height	O
Eurocard	O
VMEbus	B-Architecture
CPU	O
boards	O
.	O
</s>
<s>
The	O
VMEbus	B-Architecture
CPU	O
board	O
was	O
based	O
on	O
the	O
same	O
design	O
as	O
the	O
Multibus	B-Protocol
CPU	O
but	O
also	O
included	O
2	O
MB	O
or	O
4	O
MB	O
of	O
memory	O
,	O
the	O
Sun-2	B-Device
monochrome	O
frame	O
buffer	O
,	O
and	O
10	O
Mbit/s	O
Thick	O
Ethernet	O
on	O
board	O
.	O
</s>
<s>
Sun	O
provided	O
1	O
MB	O
Multibus	B-Protocol
memory	O
boards	O
and	O
1	O
MB	O
and	O
4	O
MB	O
VMEbus	B-Architecture
memory	O
boards	O
but	O
only	O
supported	O
configurations	O
with	O
a	O
maximum	O
of	O
4	O
MB	O
RAM	O
.	O
</s>
<s>
A	O
common	O
frame	O
buffer	O
was	O
the	O
Sun-2	B-Device
Prime	O
Monochrome	O
Video	O
.	O
</s>
<s>
This	O
board	O
provided	O
an	O
1152x900	O
monochrome	O
display	O
with	O
TTL	B-General_Concept
or	O
ECL	B-General_Concept
video	O
signals	O
,	O
and	O
keyboard	O
and	O
mouse	O
ports	O
.	O
</s>
<s>
There	O
was	O
also	O
a	O
Sun-2	B-Device
Color	O
Video	O
board	O
available	O
that	O
provided	O
an	O
1152x900	O
8-bit	O
color	O
display	O
.	O
</s>
<s>
42	O
MB	O
MFM	B-Protocol
disks	O
were	O
commonly	O
used	O
for	O
storage	O
.	O
</s>
<s>
Two	O
disks	O
could	O
be	O
connected	O
to	O
an	O
Adaptec	O
MFM/SCSI	O
and	O
then	O
to	O
a	O
Sun-2	B-Device
Multibus	B-Protocol
Serial/SCSI	O
Host	O
Adapter	O
.	O
</s>
<s>
The	O
SCSI	B-Architecture
board	O
provided	O
two	O
additional	O
serial	O
ports	O
.	O
</s>
<s>
For	O
larger	O
storage	O
requirements	O
,	O
65	O
,	O
130	O
,	O
and	O
380	O
MB	O
SMD	B-Architecture
disks	O
were	O
connected	O
to	O
a	O
Xylogics	B-Architecture
450	O
SMD	B-Architecture
Controller	O
.	O
</s>
<s>
The	O
SMD	B-Architecture
controller	O
could	O
support	O
four	O
disks	O
even	O
though	O
Sun	O
only	O
supported	O
two	O
.	O
</s>
<s>
A	O
20	O
MB	O
QIC	B-Device
tape	O
drive	O
could	O
be	O
connected	O
through	O
an	O
Archive	O
QIC/SCSI	O
converter	O
.	O
</s>
<s>
The	O
system	O
also	O
supported	O
1/2	O
"	O
tape	O
drives	O
connected	O
to	O
a	O
Computer	O
Products	O
Corporation	O
TAPEMASTER	O
or	O
a	O
Xylogics	B-Architecture
472	O
board	O
.	O
</s>
<s>
The	O
server	B-Application
could	O
support	O
diskless	B-Device
Sun-2/50	O
clients	O
through	O
the	O
Ethernet	O
board	O
.	O
</s>
<s>
Other	O
supported	O
Multibus	B-Protocol
boards	O
included	O
the	O
Sky	O
Computer	O
Floating	O
Point	O
Processor	O
,	O
Sun	O
ALM	O
(	O
Asynchronous	O
Line	O
Multiplexer	O
)	O
with	O
8	O
serial	O
ports	O
,	O
and	O
Sun	O
SunLink	O
Communications	O
Processor	O
(	O
SCP	O
)	O
for	O
SNA	B-Architecture
and	O
X.25	B-Protocol
connectivity	O
.	O
</s>
<s>
BYTE	O
in	O
August	O
1984	O
described	O
the	O
Sun-2/120	O
as	O
a	O
"	O
VAX-class	O
machine	O
"	O
,	O
with	O
"	O
superb	O
graphics	O
and	O
excellent	O
response	O
time	O
under	O
loading	O
"	O
.	O
</s>
