<s>
The	O
B20	O
is	O
a	O
line	O
of	O
microcomputers	B-Architecture
from	O
Burroughs	O
Corporation	O
.	O
</s>
<s>
The	O
B21	O
models	O
are	O
rebadged	O
Convergent	O
Technologies	O
AWS	O
workstations	O
incorporating	O
an	O
Intel	B-General_Concept
8086	I-General_Concept
CPU	O
.	O
</s>
<s>
They	O
run	O
the	O
BTOS	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
,	O
which	O
is	O
a	O
version	O
of	O
Convergent	O
's	O
CTOS	B-Operating_System
,	O
as	O
well	O
as	O
CP/M	B-Application
and	O
MS-DOS	B-Application
.	O
</s>
<s>
The	O
Burroughs	B-Device
B25	I-Device
,	O
a	O
rebadged	O
Convergent	O
NGEN	O
system	O
with	O
an	O
Intel	B-Device
80186	I-Device
CPU	O
,	O
was	O
introduced	O
in	O
1983	O
.	O
</s>
<s>
The	O
B26	O
was	O
introduced	O
in	O
1984	O
,	O
and	O
a	O
B28	O
system	O
followed	O
in	O
1985	O
based	O
on	O
the	O
Intel	B-General_Concept
80286	I-General_Concept
CPU	O
.	O
</s>
<s>
There	O
is	O
also	O
an	O
80186-based	O
B27	O
which	O
used	O
an	O
"	O
F-bus	O
"	O
rather	O
than	O
the	O
"	O
X-bus	O
"	O
used	O
on	O
the	O
B25/B26/B28	O
.	O
</s>
<s>
A	O
cluster	O
only	O
(	O
no	O
storage	O
)	O
80186-based	O
B24	O
was	O
later	O
released	O
and	O
commonly	O
used	O
by	O
bank	O
tellers	O
.	O
</s>
