<s>
The	O
VAX	B-Device
6000	I-Device
is	O
a	O
discontinued	O
family	O
of	O
minicomputers	B-Architecture
developed	O
and	O
manufactured	O
by	O
Digital	O
Equipment	O
Corporation	O
(	O
DEC	O
)	O
using	O
processors	O
implementing	O
the	O
VAX	B-Device
instruction	B-General_Concept
set	I-General_Concept
architecture	I-General_Concept
(	O
ISA	O
)	O
.	O
</s>
<s>
Originally	O
,	O
the	O
VAX	B-Device
6000	I-Device
was	O
intended	O
to	O
be	O
a	O
mid-range	O
VAX	B-Device
product	O
line	O
complementing	O
the	O
VAX	B-Device
8000	I-Device
,	O
but	O
with	O
the	O
introduction	O
of	O
the	O
VAX	B-Device
6000	I-Device
Model	O
400	O
series	O
,	O
the	O
older	O
VAX	B-Device
8000	I-Device
was	O
discontinued	O
in	O
favor	O
of	O
the	O
VAX	B-Device
6000	I-Device
,	O
which	O
offered	O
slightly	O
higher	O
performance	O
for	O
half	O
the	O
cost	O
.	O
</s>
<s>
The	O
VAX	B-Device
6000	I-Device
family	O
supports	O
Digital	O
's	O
VMS	B-Operating_System
and	O
ULTRIX	B-Operating_System
operating	O
systems	O
.	O
</s>
<s>
The	O
VAX	B-Device
6000	I-Device
was	O
housed	O
in	O
a	O
cabinet	O
which	O
contained	O
three	O
card	O
cages	O
in	O
the	O
upper	O
portion	O
:	O
a	O
14-slot	O
XMI	O
card	O
cage	O
on	O
the	O
right	O
for	O
CPU	O
and	O
memory	O
modules	O
,	O
and	O
optional	O
VAXBI	B-Architecture
Bus	I-Architecture
hardware	O
on	O
the	O
left	O
.	O
</s>
<s>
The	O
VAXBI	B-Architecture
hardware	O
distinguished	O
two	O
versions	O
of	O
the	O
VAX	B-Device
6000	I-Device
platform	O
,	O
XMI-1	O
and	O
XMI-2	O
.	O
</s>
<s>
XMI-1	O
differed	O
from	O
XMI-2	O
by	O
requiring	O
a	O
DWMBA	O
adapter	O
and	O
the	O
presence	O
of	O
two	O
6-slot	O
VAXBI	B-Architecture
channels	O
,	O
whereas	O
in	O
the	O
XMI-2	O
platform	O
,	O
VAXBI	B-Architecture
was	O
an	O
optional	O
feature	O
and	O
,	O
if	O
required	O
,	O
it	O
was	O
provided	O
as	O
a	O
single	O
12-slot	O
channel	O
.	O
</s>
<s>
In	O
both	O
versions	O
,	O
VAXBI	B-Architecture
was	O
provided	O
by	O
two	O
6-slot	O
VAXBI	B-Architecture
card	O
cages	O
.	O
</s>
<s>
The	O
VAX	B-Device
6333	O
was	O
a	O
prepackaged	O
VAXcluster	B-Operating_System
of	O
three	O
VAX	B-Device
6330	O
(	O
VAX	B-Device
6000	I-Device
Model	O
330	O
)	O
systems	O
.	O
</s>
<s>
Bundled	O
with	O
the	O
SA650	O
Storage	O
Array	O
,	O
the	O
VAX	B-Device
6333	O
cost	O
US	O
$2.8	O
million	O
.	O
</s>
<s>
The	O
VAX	B-Device
6000	I-Device
Model	O
4x0	O
,	O
code-named	O
"	O
Calypso/XRP	O
"	O
,	O
was	O
introduced	O
on	O
11	O
July	O
1989	O
.	O
</s>
<s>
The	O
KA64A	O
contained	O
a	O
35.71MHz	O
(	O
28	O
ns	O
cycle	O
time	O
)	O
Rigel	B-Device
chip	O
set	O
with	O
an	O
external	O
128KB	O
B-cache	O
(	O
L2	O
cache	O
)	O
.	O
</s>
<s>
The	O
module	O
also	O
contained	O
a	O
REXMI	O
chip	O
set	O
,	O
whose	O
purpose	O
was	O
to	O
interface	O
the	O
Rigel	B-Device
chip	O
set	O
's	O
DAL	O
(	O
data	O
and	O
address	O
line	O
)	O
bus	O
to	O
the	O
XCI	O
ASIC	O
,	O
the	O
user	O
side	O
of	O
the	O
XMI	O
corner	O
interface	O
.	O
</s>
<s>
The	O
Rigel	B-Device
chip	O
set	O
's	O
DAL	O
(	O
data	O
and	O
address	O
line	O
)	O
bus	O
was	O
interfaced	O
to	O
the	O
XMI	O
corner	O
(	O
a	O
section	O
of	O
a	O
XMI	O
module	O
containing	O
XMI	O
bus	O
logic	O
)	O
and	O
then	O
to	O
the	O
XMI	O
bus	O
by	O
the	O
REXMI	O
interface	O
.	O
</s>
<s>
The	O
Model	O
600	O
used	O
the	O
KA66A	O
CPU	O
module	O
,	O
which	O
contained	O
an	O
83.33MHz	O
(	O
12	O
ns	O
cycle	O
time	O
)	O
NVAX	B-Device
microprocessor	O
accompanied	O
by	O
an	O
external	O
2MB	O
B-cache	O
(	O
L2	O
cache	O
)	O
and	O
may	O
have	O
one	O
to	O
six	O
such	O
modules	O
.	O
</s>
<s>
The	O
NVAX	B-Device
was	O
connected	O
to	O
the	O
NEXMI	O
ASIC	O
via	O
the	O
NDAL	O
bus	O
,	O
a	O
64-bit	O
address	O
data	O
multiplexed	O
system	O
bus	O
clocked	O
at	O
27.78MHz	O
(	O
36	O
ns	O
cycle	O
time	O
)	O
.	O
</s>
<s>
The	O
NEXMI	O
ASIC	O
interfaced	O
the	O
NVAX	B-Device
to	O
the	O
XMI2	O
bus	O
,	O
by	O
providing	O
functions	O
such	O
as	O
the	O
translation	O
of	O
NDAL	O
bus	O
commands	O
to	O
XMI	O
bus	O
commands	O
.	O
</s>
