Difference between revisions of "UNIBUS backplanes"
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They came in several different generations: the earliest ones provided only [[DEC card form factor|quad]] [[Small Peripheral Controller]] slots; later ones also provided hex [[Modified UNIBUS Device]] slots (along with two SPC slots, in the end slots, where the [[UNIBUS]] entered and left the [[backplane]] on [[BC11A UNIBUS cable|BC11A cables]])). | They came in several different generations: the earliest ones provided only [[DEC card form factor|quad]] [[Small Peripheral Controller]] slots; later ones also provided hex [[Modified UNIBUS Device]] slots (along with two SPC slots, in the end slots, where the [[UNIBUS]] entered and left the [[backplane]] on [[BC11A UNIBUS cable|BC11A cables]])). | ||
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| + | Each slot held six 'connectors', DEC's term for a [[DEC edge connector contact identification|group of edge connector pins]], denominated 'A'-'F'. | ||
The earliest one, the DD11-A (used in the [[PDP-11/20]]) got its power through a paddle card which plugged into the [[DEC edge connector contact identification|3A slot/connector]]. All the later ones used one or more standard [[DEC power distribution connectors]]. | The earliest one, the DD11-A (used in the [[PDP-11/20]]) got its power through a paddle card which plugged into the [[DEC edge connector contact identification|3A slot/connector]]. All the later ones used one or more standard [[DEC power distribution connectors]]. | ||
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* [[DD11-P backplane]] - modified DD11-D used to hold the [[PDP-11/34]] [[Central Processing Unit|CPU]] | * [[DD11-P backplane]] - modified DD11-D used to hold the [[PDP-11/34]] [[Central Processing Unit|CPU]] | ||
| − | Other manufacturers, including Plessey, also produced UNIBUS backplanes. | + | Other manufacturers, including Plessey, also produced UNIBUS backplanes, such as the Plessey PM-D11/SPC-1, a 9-slot unit. |
[[Category: UNIBUS]] | [[Category: UNIBUS]] | ||
| + | [[Category: DEC Hardware]] | ||
Revision as of 19:28, 2 August 2021
UNIBUS backplanes from DEC, the DD11 backplanes, were system units which were normally installed in a BA11 mounting box. (Some CPU and device backplanes also had UNIBUS slots.)
They came in several different generations: the earliest ones provided only quad Small Peripheral Controller slots; later ones also provided hex Modified UNIBUS Device slots (along with two SPC slots, in the end slots, where the UNIBUS entered and left the backplane on BC11A cables)).
Each slot held six 'connectors', DEC's term for a group of edge connector pins, denominated 'A'-'F'.
The earliest one, the DD11-A (used in the PDP-11/20) got its power through a paddle card which plugged into the 3A slot/connector. All the later ones used one or more standard DEC power distribution connectors.
They were:
- DD11-A backplane - 4 slot
- DD11-B backplane - 4 slot, with early power distribution connector
- DD11-C backplane - 4-slot MUD, with later power distribution connectors
- DD11-D backplane - 9-slot MUD
- DD11-P backplane - modified DD11-D used to hold the PDP-11/34 CPU
Other manufacturers, including Plessey, also produced UNIBUS backplanes, such as the Plessey PM-D11/SPC-1, a 9-slot unit.
