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]])). | ||
| − | Each slot held six 'connectors' | + | Each slot held six 'connectors' (DEC's term for a group of [[DEC edge connector contact identification|edge connector pins]]), denominated 'A'-'F'. |
| − | The earliest | + | The earliest backplane, 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]]. |
They were: | They were: | ||
Latest revision as of 11:40, 25 August 2024
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 backplane, 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.
External links
- Douglas Electronics still sells extender cards for DEC backplanes
