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]]:
  
* M8275 - SBI/MBA interface
+
{| class="wikitable"
* 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 cable]]s to what appears to be a standard MASSBUS connector, in an 'expansion I/O connector' on the side of the cabinet.
 
<!-- {| class="wikitable"
 
 
! 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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Latest 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