RH780 Massbus Adapter

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The RH780 Massbus Adapter was a MASSBUS device controller for the VAX-11/780's Synchronous Backplane Interconnect.

It was implemented on four hex cards:

  • M8275 - SBI/MBA interface
  • M8276 - internal registers
  • M8277 - MASSBUS data paths
  • M8278 - MASSBUS control paths

They mount in a custom 6-slot backplane; 1 slot is unused, and 1 slot (on the back of the backplane) is used to hold a hex M9041 paddle card, which carries the MASSBUS out on three BC06R flat cables to what appears to be a standard MASSBUS connector, in an 'expansion I/O connector' on the side of the cabinet.

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