UNIBUS backplanes - Revision history

Jnc: Clarify

2024-08-25T10:40:47Z

Clarify

Jnc: Clarify

2024-08-24T06:38:20Z

Clarify

Jnc: /* External links */ Douglas site changed

2024-04-06T21:18:50Z

‎External links: Douglas site changed

Jnc: Better cat

2022-12-05T17:05:54Z

Better cat

Jnc: /* External links */ +Douglas Electronics

2022-04-09T15:25:37Z

‎External links: +Douglas Electronics

Jnc: A-F 'connectors'

2021-08-02T17:28:13Z

A-F 'connectors'

Jnc: +Plessey unit

2021-01-29T00:30:26Z

+Plessey unit

Jnc: clearer

2021-01-28T09:48:47Z

clearer

Jnc: pretty complete

2021-01-27T22:41:42Z

pretty complete

New page

'''UNIBUS backplanes''' from [[Digital Equipment Corporation|DEC]], the [[DD11 backplanes]], were [[system unit]]s which were normally installed in a [[BA11 mounting boxes|BA11 mounting box]]. (Some [[Central Processing Unit|CPU]] and [[peripheral controller|device]] [[backplane]]s also had [[UNIBUS]] slots.)

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]]).

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]].

Other manufacturers, including Plessey, also produced UNIBUS backplanes.

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]] [[Central Processing Unit|CPU]]

[[Category: UNIBUS]]

@@ Line 3: / Line 3: @@
 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' (DEC's term for a [[DEC edge connector contact identification|group of edge connector pins]]), denominated 'A'-'F'.
+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 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]].

@@ Line 3: / Line 3: @@
 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', DEC's term for a [[DEC edge connector contact identification|group of edge connector pins]], denominated 'A'-'F'.
+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 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:

@@ Line 19: / Line 19: @@
 ==External links==
-* [http://www.douglas.com/ Douglas Electronics] still sells extender cards for DEC backplanes
+* [http://www.douglaspcb.com/ Douglas Electronics] still sells extender cards for DEC backplanes
-** [http://www.douglas.com/index.php/6-de-11.html DE-11 dual extender]
+** [https://www.douglaspcb.com/index.php/6-de-11.html 6-DE-11-C dual extender]
-** [http://www.douglas.com/index.php/6-de-8.html DE-8 quad extender]
+** [https://www.douglaspcb.com/index.php/6-de-8.html 6-DE-8-C quad extender]
 [[Category: UNIBUS Backplanes]]

← Older revision		Revision as of 17:05, 5 December 2022
Line 23:		Line 23:
	** [http://www.douglas.com/index.php/6-de-8.html DE-8 quad extender]		** [http://www.douglas.com/index.php/6-de-8.html DE-8 quad extender]

−	[[Category: UNIBUS]]	+	[[Category: UNIBUS Backplanes]]
−	~~[[Category: DEC Hardware~~]]

@@ Line 16: / Line 16: @@
 Other manufacturers, including Plessey, also produced UNIBUS backplanes, such as the Plessey PM-D11/SPC-1, a 9-slot unit.
 [[Category: UNIBUS]]
 [[Category: DEC Hardware]]

@@ Line 13: / Line 13: @@
 * [[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]]