<s>
The	O
BBN	B-Device
Butterfly	I-Device
was	O
a	O
massively	O
parallel	B-Operating_System
computer	I-Operating_System
built	O
by	O
Bolt	O
,	O
Beranek	O
and	O
Newman	O
in	O
the	O
1980s	O
.	O
</s>
<s>
Each	O
machine	O
had	O
up	O
to	O
512	O
CPUs	B-General_Concept
,	O
each	O
with	O
local	O
memory	O
,	O
which	O
could	O
be	O
connected	O
to	O
allow	O
every	O
CPU	O
access	O
to	O
every	O
other	O
CPU	O
's	O
memory	O
,	O
although	O
with	O
a	O
substantially	O
greater	O
latency	O
(	O
roughly	O
15:1	O
)	O
than	O
for	O
its	O
own	O
.	O
</s>
<s>
The	O
CPUs	B-General_Concept
were	O
commodity	O
microprocessors	O
.	O
</s>
<s>
The	O
second	O
or	O
third	O
generation	O
,	O
GP-1000	O
models	O
used	O
Motorola	B-Device
68020	I-Device
's	O
and	O
scaled	O
to	O
256	O
CPUs	B-General_Concept
.	O
</s>
<s>
The	O
later	O
,	O
TC-2000	O
models	O
used	O
Motorola	O
MC88100	B-General_Concept
's	O
,	O
and	O
scaled	O
to	O
512	O
CPUs	B-General_Concept
.	O
</s>
<s>
The	O
Butterfly	O
was	O
initially	O
developed	O
as	O
the	O
Voice	B-Protocol
Funnel	I-Protocol
,	O
a	O
router	O
for	O
the	O
ST-II	O
protocol	O
intended	O
for	O
carrying	O
voice	O
and	O
video	O
over	O
IP	O
networks	O
.	O
</s>
<s>
The	O
Butterfly	O
began	O
with	O
a	O
proprietary	O
operating	B-General_Concept
system	I-General_Concept
called	O
Chrysalis	O
,	O
but	O
moved	O
to	O
a	O
Mach	B-Operating_System
kernel	I-Operating_System
operating	B-General_Concept
system	I-General_Concept
in	O
1989	O
.	O
</s>
<s>
TotalView	O
,	O
the	O
parallel	B-Operating_System
program	I-Operating_System
debugger	O
developed	O
for	O
the	O
Butterfly	O
,	O
outlived	O
the	O
platform	O
and	O
was	O
ported	O
to	O
a	O
number	O
of	O
other	O
massively	O
parallel	B-Operating_System
machines	I-Operating_System
.	O
</s>
