BA11-C Mounting Box - Revision history

Jnc: New cat

2023-07-11T01:11:17Z

New cat

Jnc: bold variant names

2022-01-23T13:53:16Z

bold variant names

Jnc: Update after -E created

2018-12-01T03:44:56Z

Update after -E created

Jnc: Jnc moved page BA11 Mounting Box to BA11-C Mounting Box without leaving a redirect: Correct name

2018-12-01T03:18:57Z

Jnc moved page BA11 Mounting Box to BA11-C Mounting Box without leaving a redirect: Correct name

Jnc: +cat

2018-09-20T00:47:52Z

+cat

Jnc: Better link

2018-07-16T01:39:37Z

Better link

Jnc: Jnc moved page BA11 mounting box to BA11 Mounting Box: Caps per DEC docs

2018-07-12T13:19:35Z

Jnc moved page BA11 mounting box to BA11 Mounting Box: Caps per DEC docs

Jnc: Note board direction; fix tense

2017-10-30T11:31:16Z

Note board direction; fix tense

Jnc: Avoid redir

2017-10-29T23:33:19Z

Avoid redir

Jnc: link back to series page, for people who get here by mistake

2017-10-29T18:30:47Z

link back to series page, for people who get here by mistake

← Older revision		Revision as of 01:11, 11 July 2023
Line 13:		Line 13:
	The BA11's dimensions were 10-1/2" high, 19" wide, and 23" deep; the H720 was 8" high, 16-1/2" wide, and 6" deep, and weighed 30 lbs.		The BA11's dimensions were 10-1/2" high, 19" wide, and 23" deep; the H720 was 8" high, 16-1/2" wide, and 6" deep, and weighed 30 lbs.

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

@@ Line 1: / Line 1: @@
 The '''BA11-C Mounting Box''' was  one of the two earliest earliest standard  [[system unit]] [[backplane]] [[mounting box]]es produced by [[Digital Equipment Corporation|DEC]], along with the [[BA11-E Mounting Box]]. It was used to hold the [[KA11 CPU|KA11]] [[Central Processing Unit|CPU]] and [[front console]] (programmer's console or 'controller console') for the [[PDP-11/20]] (hence the -C variant suffix).
-It came in two variants, the rack-mounted BA11-CS (including Tilt and Lock chassis slides), and the table-top BA11-CC. 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-C mounting box was designed for these spaces.
+It came in two variants, the rack-mounted '''BA11-CS''' (including Tilt and Lock chassis slides), and the table-top '''BA11-CC'''. 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-C mounting box was designed for these spaces.
-The system units were mounted transversely, but because the cooling fans were mounted along the side of the box, they could not hold extended-length [[DEC card form factor|hex]]-height cards; only shorter (lower) modules, such as the [[M920 UNIBUS Jumper]], could be placed in the [[DEC edge connector contact identification|A-row connectors]].
+The system units were mounted transversely, but because the cooling fans were mounted along the side of the box, they could not hold extended-length [[DEC card form factor|hex]]-height cards; only shorter (sometimes called 'lower' - DEC location nomenclature assumed that the boards had their side edge at the top) modules, such as the [[M920 UNIBUS Jumper]], could be placed in the [[DEC edge connector contact identification|A-row connectors]].
 The system units faced downward (unlike the later [[BA11 mounting boxes]], where they were facing up); the reason was probably to give easier access to the backplane wiring for [[debug]]ging. The unit could rotate to give easier access to the boards.

@@ Line 1: / Line 1: @@
-The '''BA11 mounting box''' was the first of a series of [[DEC card form factor|hex]] [[system unit]] [[backplane]] mounting boxes for the [[H960 rack|H960]] series of 19"-wide racks produced by [[Digital Equipment Corporation|DEC]].
+The '''BA11-C Mounting Box''' was  one of the two earliest earliest standard  [[system unit]] [[backplane]] [[mounting box]]es produced by [[Digital Equipment Corporation|DEC]], along with the [[BA11-E Mounting Box]]. It was used to hold the [[KA11 CPU|KA11]] [[Central Processing Unit|CPU]] and [[front console]] (programmer's console or 'controller console') for the [[PDP-11/20]] (hence the -C variant suffix).
-The H960 racks provided 63" of vertical mounting space, divided into units of 10-1/2", which were further subdividable into a pair of 5-1/4" spaces. The 10-1/2" tall BA11 mounting box was designed for these spaces.
+It came in two variants, the rack-mounted BA11-CS (including Tilt and Lock chassis slides), and the table-top BA11-CC. 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-C mounting box was designed for these spaces.
-Although they were intended to be rack-mounted, they were available in table-top configuration as well.
+The system units were mounted transversely, but because the cooling fans were mounted along the side of the box, they could not hold extended-length [[DEC card form factor|hex]]-height cards; only shorter (lower) modules, such as the [[M920 UNIBUS Jumper]], could be placed in the [[DEC edge connector contact identification|A-row connectors]].
-BA11's csme in both 'basic box' and 'expansion box' models; the former contained the [[KA11 CPU|KA11 processor]], and had a programmer's console front panel, and the latter 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.
+The system units faced downward (unlike the later [[BA11 mounting boxes]], where they were facing up); the reason was probably to give easier access to the backplane wiring for [[debug]]ging. The unit could rotate to give easier access to the boards.
-The BA11 came with the [[H720 Power Supply]]. The supply was mounted transversely in the box at the rear.
+The BA11 came with the [[H720 Power Supply]]; it was mounted transversely in the box at the rear.
-The system units were also mounted transversely, but because the cooling fans were mounted along the side of the box, they could not hold extended-length hex-height cards; only shorter (lower) modules, such as the [[M920 UNIBUS Jumper]], could be placed in the [[DEC edge connector contact identification|A-row connectors]].
+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 connector in slot 3).
 The BA11's dimensions were 10-1/2" high, 19" wide, and 23" deep; the H720 was 8" high, 16-1/2" wide, and 6" deep, and weighed 30 lbs.
 [[Category: DEC Hardware]]

← Older revision		Revision as of 00:47, 20 September 2018
Line 14:		Line 14:

	The BA11's dimensions were 10-1/2" high, 19" wide, and 23" deep; the H720 was 8" high, 16-1/2" wide, and 6" deep, and weighed 30 lbs.		The BA11's dimensions were 10-1/2" high, 19" wide, and 23" deep; the H720 was 8" high, 16-1/2" wide, and 6" deep, and weighed 30 lbs.
		+
		+	[[Category: DEC Hardware]]

@@ Line 9: / Line 9: @@
 The BA11 came with the [[H720 Power Supply]]. The supply was mounted transversely in the box at the rear.
-The system units were also mounted transversely, but because the cooling fans were mounted along the side of the box, they could not hold extended-length hex-height cards; only shorter (lower) modules, such as the [[M920 UNIBUS Jumper]], could be placed in the [[DEC card form factor|A-row connectors]].
+The system units were also mounted transversely, but because the cooling fans were mounted along the side of the box, they could not hold extended-length hex-height cards; only shorter (lower) modules, such as the [[M920 UNIBUS Jumper]], could be placed in the [[DEC edge connector contact identification|A-row connectors]].
 The system units faced downward (unlike the later [[BA11 mounting boxes]], where they were facing up); the reason was probably to give easier access to the backplane wiring for debugging. The unit could rotate to give easier access to the boards.
 The BA11's dimensions were 10-1/2" high, 19" wide, and 23" deep; the H720 was 8" high, 16-1/2" wide, and 6" deep, and weighed 30 lbs.

← Older revision	Revision as of 03:18, 1 December 2018
(No difference)

← Older revision	Revision as of 13:19, 12 July 2018
(No difference)

← Older revision		Revision as of 18:30, 29 October 2017
Line 1:		Line 1:
−	The '''BA11''' is the first of a series of [[DEC card form factor\|hex]] [[system unit]] [[backplane]] mounting boxes for the [[H960 rack\|H960]] series of 19"-wide racks produced by [[Digital Equipment Corporation\|DEC]]. Although they were intended to be rack-mounted, they were available in table-top configuration as well.	+	The '''BA11 mounting box''' was the first of a series of [[DEC card form factor\|hex]] [[system unit]] [[backplane]] mounting boxes for the [[H960 rack\|H960]] series of 19"-wide racks produced by [[Digital Equipment Corporation\|DEC]], the [[BA11 mounting boxes]].
		+
		+	Although they were intended to be rack-mounted, they were available in table-top configuration as well.

	The H960 racks provided 63" of vertical mounting space, divided into units of 10-1/2", which were further subdividable into a pair of 5-1/4" spaces. The 10-1/2" tall BA11 mounting box was designed for these spaces.		The H960 racks provided 63" of vertical mounting space, divided into units of 10-1/2", which were further subdividable into a pair of 5-1/4" spaces. The 10-1/2" tall BA11 mounting box was designed for these spaces.