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 (2 slots unused)

This article is not as complete coverage of the topic as it could be. You can help by expanding it.

External links

RH780 Massbus Adapter Technical Description (EK-RH780-TD-001)
RH780 Field Maintenance Print Set (MP-00499)

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