BA11-E Mounting Box - Revision history

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2023-07-11T01:13:47Z

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Jnc: clarify location; bold variant names

2022-01-23T12:29:01Z

clarify location; bold variant names

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2018-12-01T10:38:24Z

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2018-12-01T03:46:00Z

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2018-12-01T03:34:05Z

details on role

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2018-12-01T03:12:19Z

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The '''BA11-E mounting box''' was one of the two earliest earliest standard [[system unit]] [[backplane]] [[mounting box]] produced by [[Digital Equipment Corporation|DEC]], along with the [[BA11-C Mounting Box]]. One of the [[BA11 mounting boxes]], it was used in the expansion box role with the early [[PDP-11]]'s, particularly the [[PDP-11/20]].

It came in two variants, the rack-mounted BA11-ES (including Tilt and Lock chassis slides), and the table-top BA11-EC. The rack-mounted ones were usually mounted in the [[H960 rack|H960]] series of 19"-wide racks, which provided 63" of vertical mounting space, divided into units of 10-1/2". The 10-1/2" tall BA11-E mounting box was designed for these spaces

A BA11-E could hold up to six standard size (4-slot) system units; these were mounted transversely, facing down. They were generally mounted with the [[DEC edge connector contact identification|A-row connectors]] at the left-hand side.

A set of four cooling fans was also mounted at the left-hand side of the box, to provide air-flow to the boards and [[power supply]]. Since the fans intruded into the space 'above' the backplanes, the latter could not hold [[DEC card form factor|hex]] cards, only quads, plus a single [[DEC card form factor|extended length]] card.

The BA11-E came with the [[H720 Power Supply]]; it was a separate unit, also mounted transversely in the box, at the back. It contained a [[transformer]], and a [[printed circuit board|PCB]] which supplied -15V (10A), and +5V (22A).

Later versions of the H720 had a pair of connections to the standard DEC [[Remote Switching Control Bus]], so it could turn other units off and on with its power switch.

The [[power harness]] ran along the left-hand side; it contained a number of single-width stub cards, which plugged into the power supply slot in the system units (generally the A [[DEC edge connector contact identification|connector]] in slot 3).

The BA11-E's dimensions were 10-1/2" high, 19" wide, and 23" deep; it weighed roughly 100 lbs (including some backplanes and boards).

[[Category: DEC Hardware]]

← Older revision		Revision as of 01:13, 11 July 2023
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	* [[BA11 mounting boxes]]		* [[BA11 mounting boxes]]

−	[[Category: DEC ~~Hardware~~]]	+	[[Category: DEC Mounting Boxes]]

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 The '''BA11-E mounting box''' was one of the two earliest earliest standard [[system unit]] [[backplane]] [[mounting box]] produced by [[Digital Equipment Corporation|DEC]], along with the [[BA11-C Mounting Box]].
-One of the [[BA11 mounting boxes]], it was used in the expansion box role with the early [[PDP-11]]'s, particularly the [[PDP-11/20]]. In that role, it was used to hold extra [[core memory|core]] [[main memory]] systems (each in their own custom system unit) and other devices, and had a blank front panel.
+One of the [[BA11 mounting boxes]], it was used in the expansion box role with the early [[PDP-11]]'s, particularly the [[PDP-11/20]] (hence the -E variant suffix). In that role, it was used to hold extra [[core memory|core]] [[main memory]] systems (each in their own custom system unit) and other devices, and had a blank front panel.
 It came in two variants, the rack-mounted BA11-ES (including Tilt and Lock chassis slides), and the table-top BA11-EC. The rack-mounted ones were usually mounted in the [[H960 rack|H960]] series of 19"-wide racks, which provided 63" of vertical mounting space, divided into units of 10-1/2". The 10-1/2" tall BA11-E mounting box was designed for these spaces

← Older revision		Revision as of 03:34, 1 December 2018
Line 1:		Line 1:
−	The '''BA11-E mounting box''' was one of the two earliest earliest standard [[system unit]] [[backplane]] [[mounting box]] produced by [[Digital Equipment Corporation\|DEC]], along with the [[BA11-C Mounting Box]]. One of the [[BA11 mounting boxes]], it was used in the expansion box role with the early [[PDP-11]]'s, particularly the [[PDP-11/20]].	+	The '''BA11-E mounting box''' was one of the two earliest earliest standard [[system unit]] [[backplane]] [[mounting box]] produced by [[Digital Equipment Corporation\|DEC]], along with the [[BA11-C Mounting Box]].
		+
		+	One of the [[BA11 mounting boxes]], it was used in the expansion box role with the early [[PDP-11]]'s, particularly the [[PDP-11/20]]. In that role, it was used to hold extra [[core memory\|core]] [[main memory]] systems (each in their own custom system unit) and other devices, and had a blank front panel.

	It came in two variants, the rack-mounted BA11-ES (including Tilt and Lock chassis slides), and the table-top BA11-EC. The rack-mounted ones were usually mounted in the [[H960 rack\|H960]] series of 19"-wide racks, which provided 63" of vertical mounting space, divided into units of 10-1/2". The 10-1/2" tall BA11-E mounting box was designed for these spaces		It came in two variants, the rack-mounted BA11-ES (including Tilt and Lock chassis slides), and the table-top BA11-EC. The rack-mounted ones were usually mounted in the [[H960 rack\|H960]] series of 19"-wide racks, which provided 63" of vertical mounting space, divided into units of 10-1/2". The 10-1/2" tall BA11-E mounting box was designed for these spaces

@@ Line 3: / Line 3: @@
 It was created for the expansion box role (hence the -E variant suffix) with the early [[PDP-11]]'s (particularly the [[PDP-11/20]]). In that role, it was used to hold extra [[core memory|core]] [[main memory]] systems (each in their own custom system unit) and other devices, and had a blank front panel.
-It came in two variants, the rack-mounted BA11-ES (including Tilt and Lock chassis slides), and the table-top BA11-EC. The rack-mounted ones were usually mounted in the [[H960 rack|H960]] series of 19"-wide racks, which provided 63" of vertical mounting space, divided into units of 10-1/2". The 10-1/2" tall BA11-E mounting box was designed for these spaces
+It came in two variants, the rack-mounted '''BA11-ES''' (including Tilt and Lock chassis slides), and the table-top '''BA11-EC'''. The rack-mounted ones were usually mounted in the [[H960 rack|H960]] series of 19"-wide racks, which provided 63" of vertical mounting space, divided into units of 10-1/2". The 10-1/2" tall BA11-E mounting box was designed for these spaces
 A BA11-E could hold up to six standard size (4-slot) system units; these were mounted transversely, facing down. They were generally mounted with the [[DEC edge connector contact identification|A-row connectors]] at the left-hand side.
-A set of four cooling fans was also mounted at the left-hand side of the box, to provide air-flow to the boards and [[power supply]]. Since the fans intruded into the space 'above' the backplanes, the latter could not hold [[DEC card form factor|hex]] cards, only quads, plus a single [[DEC card form factor|extended length]] card.
+A set of four cooling fans was also mounted at the left-hand side of the box, to provide air-flow to the boards and [[power supply]]. Since the fans intruded into the space 'above' (actually, to the side of, in the BA11-E - DEC location nomenclature assumes that the boards have their side edge at the top) the backplanes, the latter could not hold [[DEC card form factor|hex]] cards, only quads, plus a single [[DEC card form factor|extended length]] card.
 The BA11-E came with the [[H720 Power Supply]]; it was a separate unit, also mounted transversely in the box, at the back. It contained a [[transformer]], and a [[printed circuit board|PCB]] which supplied -15V (10A), and +5V (22A).