<s>
The	O
Synchronous	B-Architecture
Backplane	I-Architecture
Interconnect	I-Architecture
(	O
SBI	O
)	O
was	O
the	O
internal	O
processor-memory	O
bus	O
used	O
by	O
early	O
VAX	B-Device
computers	O
manufactured	O
by	O
the	O
Digital	O
Equipment	O
Corporation	O
of	O
Maynard	O
,	O
Massachusetts	O
.	O
</s>
<s>
The	O
bus	O
was	O
implemented	O
using	O
Schottky	O
TTL	B-General_Concept
logic	I-General_Concept
levels	O
and	O
allowed	O
multiprocessor	B-Operating_System
operation	O
.	O
</s>
