<s>
The	O
R6000	B-Device
is	O
a	O
microprocessor	B-Architecture
chip	O
set	O
developed	O
by	O
MIPS	O
Computer	O
Systems	O
that	O
implemented	O
the	O
MIPS	O
II	O
instruction	B-General_Concept
set	I-General_Concept
architecture	I-General_Concept
(	O
ISA	O
)	O
.	O
</s>
<s>
The	O
chip	O
set	O
consisted	O
of	O
the	O
R6000	B-Device
microprocessor	B-Architecture
,	O
R6010	O
floating-point	O
unit	O
and	O
R6020	O
system	O
bus	O
controller	O
.	O
</s>
<s>
The	O
R6000	B-Device
was	O
the	O
first	O
implementation	O
of	O
the	O
MIPS	O
II	O
ISA	O
.	O
</s>
<s>
The	O
R6000	B-Device
was	O
implemented	O
with	O
emitter-coupled	B-General_Concept
logic	I-General_Concept
(	O
ECL	O
)	O
.	O
</s>
<s>
In	O
the	O
mid	O
-	O
to	O
late	O
1980s	O
,	O
the	O
trend	O
was	O
to	O
implement	O
high-end	O
microprocessors	B-Architecture
with	O
high-speed	O
logic	O
such	O
as	O
ECL	O
.	O
</s>
<s>
As	O
MIPS	O
was	O
a	O
fabless	B-Algorithm
company	O
,	O
the	O
R6000	B-Device
chip	O
set	O
was	O
fabricated	B-Architecture
by	O
Bipolar	O
Integrated	O
Technology	O
(	O
BIT	O
)	O
who	O
had	O
acted	O
as	O
a	O
foundry	O
for	O
MIPS	O
since	O
November	O
1989	O
.	O
</s>
<s>
However	O
,	O
manufacturing	O
issues	O
that	O
had	O
caused	O
"	O
sporadic	O
deliveries	O
"	O
of	O
the	O
R6000	B-Device
to	O
MIPS	O
Computer	O
Systems	O
resulted	O
in	O
contractual	O
restrictions	O
being	O
imposed	O
on	O
BIT	O
,	O
preventing	O
the	O
company	O
from	O
supplying	O
other	O
potential	O
customers	O
.	O
</s>
<s>
The	O
R6000	B-Device
had	O
few	O
users	O
.	O
</s>
<s>
MIPS	O
used	O
the	O
R6000	B-Device
in	O
their	O
RC6260	O
and	O
RC6280	O
servers	O
.	O
</s>
