Description
The VAX 9000 was a multiprocessor and supported one, two, three or four CPUs clocked at 62.5 MHz (16 ns cycle time). The system was based around a crossbar switch in the system control unit (SCU), to which the one to four CPUs, two memory controllers, two input/output (I/O) controllers and a service processor connected. I/O was provided by four Extended Memory Interconnect (XMI) buses.
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