Difference between revisions of "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]]. | The '''RH780 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/780]]'s [[Synchronous Backplane Interconnect]]. | ||
| − | It was implemented on four [[DEC card form factor|hex]] cards: | + | It was implemented on four [[DEC card form factor|hex]] cards, which mount in a custom 6-slot [[backplane]]: |
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! Slot !! Board !! Acronym !! Function | ! Slot !! Board !! Acronym !! Function | ||
|- | |- | ||
| + | | 1 || M8275 || MSI || SBI/MBA interface | ||
| + | |- | ||
| + | | 2 || M8276 || MIR || internal registers | ||
| + | |- | ||
| + | | 3 || M8277 || MDP || MASSBUS data paths | ||
| + | |- | ||
| + | | 4 || M8278 || MCP || MASSBUS control paths | ||
| + | |} | ||
| + | |||
| + | One slot (5) is unused, and one slot (6) is used (on the back of the backplane) to hold a hex M9041 paddle card, which carries the MASSBUS out on three BC06R [[flat cable]]s 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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{{semi-stub}} | {{semi-stub}} | ||
Revision as of 15:26, 6 January 2022
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, which mount in a custom 6-slot backplane:
| Slot | Board | Acronym | Function |
|---|---|---|---|
| 1 | M8275 | MSI | SBI/MBA interface |
| 2 | M8276 | MIR | internal registers |
| 3 | M8277 | MDP | MASSBUS data paths |
| 4 | M8278 | MCP | MASSBUS control paths |
One slot (5) is unused, and one slot (6) is used (on the back of the backplane) 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.
External links
- RH780 Massbus Adapter Technical Description (EK-RH780-TD-001)
- RH780 Field Maintenance Print Set (MP-00499)
