Hardware
A Pluribus consisted of two or more standard 19" electronic equipment racks, each divided into four bays. Each bay contained a backplane bus and an independent power supply. A bay might contain a processor bus, a shared memory bus, or an I/O bus. Custom-built bus couplers connected the bays to one another so that the processors could reach the shared memory and the I/O devices.
A 6-processor Pluribus was used as a network switch to interconnect BBN's five Tenex/"Twenex" timesharing systems along with 378 terminals on direct serial and dial-in modem lines. The Pluribus used the Lockheed SUE as its processor. The SUE was similar to DEC's PDP-11.
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