BA11-N mounting box - Revision history

Jnc: +New category

2024-07-26T15:11:05Z

+New category

Jnc: New cat

2023-07-11T01:22:00Z

New cat

Jnc: +docs

2023-07-09T03:53:37Z

+docs

Jnc: /* External links */ +microcomputer interfaces handbook

2023-07-02T18:55:39Z

‎External links: +microcomputer interfaces handbook

Jnc: content moved to H9273

2022-07-05T09:52:53Z

content moved to H9273

Jnc: link backplane

2022-07-05T01:26:39Z

link backplane

Jnc: /* External links */ +FMPS

2022-07-04T21:54:54Z

‎External links: +FMPS

Jnc: /* Further reading */ +EK-BA11N-TM-001

2022-07-04T01:45:03Z

‎Further reading: +EK-BA11N-TM-001

Jnc: start page for H786; /* External links */ +EK-BA11N-UG-001

2022-07-04T01:17:44Z

start page for H786; ‎External links: +EK-BA11N-UG-001

Jnc: avoid redir

2019-11-16T15:54:25Z

avoid redir

← Older revision		Revision as of 15:11, 26 July 2024
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	[[Category: DEC Mounting Boxes]]		[[Category: DEC Mounting Boxes]]
		+	[[Category: QBUS Hardware]]

← Older revision		Revision as of 01:22, 11 July 2023
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	* [http://www.bitsavers.org/pdf/dec/qbus/MP00740_1123_schem_Oct81.pdf PDP11/23 Field Maintenance Print Set] (MP00740) - Contains the BA11-N Field Maintenance Print Set (MP00487) on pp. 32-87)		* [http://www.bitsavers.org/pdf/dec/qbus/MP00740_1123_schem_Oct81.pdf PDP11/23 Field Maintenance Print Set] (MP00740) - Contains the BA11-N Field Maintenance Print Set (MP00487) on pp. 32-87)

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

@@ Line 14: / Line 14: @@
 The BA11-N's dimensions were 5-1/4" high, 19" wide, and 22-3/4" deep, and it weighed 44 lbs (without any boards). The rack mounting was 26-3/4" long.
 ==See also==
 * [[BA11-S mounting box]]
@@ Line 22: / Line 25: @@
 * ''BA11-N Mounting Box Technical Manual'' (EK-BA11N-TM-001) - not available online
 ==External links==
 * [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Interfaces_Handbook_1980.pdf microcomputer interfaces handbook] - BA11-N is covered on pp. 74-82, 82-90 of the PDF
 * [http://www.bitsavers.org/pdf/dec/qbus/EK-BA11N-UG-001_BA11-N_Mounting_Box_Users_Guide_Jan78.pdf BA11-N mounting box user's guide] (EK-BA11N-UG-001)
 * [http://www.bitsavers.org/pdf/dec/qbus/MP00740_1123_schem_Oct81.pdf PDP11/23 Field Maintenance Print Set] (MP00740) - Contains the BA11-N Field Maintenance Print Set (MP00487) on pp. 32-87)
 [[Category: DEC Hardware]]

@@ Line 25: / Line 25: @@
 ==External links==
 * [http://www.bitsavers.org/pdf/dec/qbus/EK-BA11N-UG-001_BA11-N_Mounting_Box_Users_Guide_Jan78.pdf BA11-N mounting box user's guide] (EK-BA11N-UG-001)
 * [http://www.bitsavers.org/pdf/dec/qbus/MP00740_1123_schem_Oct81.pdf PDP11/23 Field Maintenance Print Set] (MP00740) - Contains the BA11-N Field Maintenance Print Set (MP00487) on pp. 32-87)
 [[Category: DEC Hardware]]

@@ Line 1: / Line 1: @@
 The '''BA11-N mounting box''' was the a [[mounting box]] used for [[QBUS]] [[PDP-11]]'s from [[Digital Equipment Corporation|DEC]]. It included an [[H786 power supply]], and an [[H9273 backplane|H9273-A]] 9-slot [[QBUS#Backplanes|Q/CD]] [[backplane]], which could hold [[DEC card form factor|quad-sized]] cards.
-The H9273-A was a [[QBUS#Variable_address_size|Q18]] backplane, but it is relatively easy to [[upgrading QBUS backplanes|upgrade it to Q22]].
+The manual says the BA11-N was for [[PDP-11/03L]]'s, but the [[LSI-11]] used in that machine was only [[QBUS#Variable_address_size|Q16]] capable, making the Q18 H9273 backplane superfluous, like that in the [[BA11-M mounting box]]. Once the [[PDP-11/23]] appeared, BA11-N's could be used with it (and perhaps the BA11-N was looking forward to this machine) - but after the -A revision of the /23's [[KDF11-A CPU]] (Q18 only), later revisions really were better off with a Q22 backplane, as in the up-rated [[BA11-S mounting box]].
-The manual says the BA11-N was for [[PDP-11/03L]]'s, but the [[LSI-11]] used in that machine was only Q16 capable, making the Q18 backplane superfluous, like that in the [[BA11-M mounting box]]. Once the [[PDP-11/23]] appeared, BA11-N's could be used with it (and perhaps the BA11-N was looking forward to this machine) - but after the -A revision of the /23's [[KDF11-A CPU]] (Q18 only), later revisions really were better off with a Q22 backplane, as in the uprated [[BA11-S mounting box]].
+Since the H9273 was a Q/[[CD interconnect|CD]] backplane, dual-width [[QBUS]] cards could only be placed in the left-hand slots, and quad QBUS-only cards had to not use any pins on the [[DEC edge connector contact identification|right-hand C/D connectors]]. (The only DEC card with a problem with this seems to have been the [[MMV11-A QBUS core memory|MMV11-A]].)
 It was available both with a front panel with a bezel (with '[[bootstrap|Boot]]', '[[Halt]]' and '[[LTC]] On' switches, and power and run status indicators); and also with a blank front panel (for use as an expansion box).

← Older revision		Revision as of 01:26, 5 July 2022
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−	The '''BA11-N mounting box''' was the a [[mounting box]] used for [[QBUS]] [[PDP-11]]'s from [[Digital Equipment Corporation\|DEC]]. It included an [[H786 power supply]], and an H9273-A 9-slot [[QBUS#Backplanes\|Q/CD]] [[backplane]], which could hold [[DEC card form factor\|quad-sized]] cards.	+	The '''BA11-N mounting box''' was the a [[mounting box]] used for [[QBUS]] [[PDP-11]]'s from [[Digital Equipment Corporation\|DEC]]. It included an [[H786 power supply]], and an [[H9273 backplane\|H9273-A]] 9-slot [[QBUS#Backplanes\|Q/CD]] [[backplane]], which could hold [[DEC card form factor\|quad-sized]] cards.

	The H9273-A was a [[QBUS#Variable_address_size\|Q18]] backplane, but it is relatively easy to [[upgrading QBUS backplanes\|upgrade it to Q22]].		The H9273-A was a [[QBUS#Variable_address_size\|Q18]] backplane, but it is relatively easy to [[upgrading QBUS backplanes\|upgrade it to Q22]].

← Older revision		Revision as of 01:45, 4 July 2022
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	* [[BA11-S mounting box]]		* [[BA11-S mounting box]]
		+
		+	==Further reading==
		+
		+	* ''BA11-N Mounting Box Technical Manual'' (EK-BA11N-TM-001) - not available online

	==External links==		==External links==

@@ Line 1: / Line 1: @@
-The '''BA11-N mounting box''' was the a [[mounting box]] used for [[QBUS]] [[PDP-11]]'s from [[Digital Equipment Corporation|DEC]]. It included an H786 [[power supply]] (which provided 22A of +5V, and 11A of +12V; although some sources give 15A and 8A respectively); and an H9273-A 9-slot [[QBUS#Backplanes|Q/CD]] [[backplane]], which could hold [[DEC card form factor|quad-sized]] cards.
+The '''BA11-N mounting box''' was the a [[mounting box]] used for [[QBUS]] [[PDP-11]]'s from [[Digital Equipment Corporation|DEC]]. It included an [[H786 power supply]], and an H9273-A 9-slot [[QBUS#Backplanes|Q/CD]] [[backplane]], which could hold [[DEC card form factor|quad-sized]] cards.
 The H9273-A was a [[QBUS#Variable_address_size|Q18]] backplane, but it is relatively easy to [[upgrading QBUS backplanes|upgrade it to Q22]].
@@ Line 7: / Line 7: @@
 Since it was a Q/[[CD interconnect|CD]] backplane, dual-width [[QBUS]] cards could only be placed in the left-hand slots, and quad QBUS-only cards had to not use any pins on the [[DEC edge connector contact identification|right-hand C/D connectors]]. (The only DEC card with a problem with this seems to have been the [[MMV11-A QBUS core memory|MMV11-A]].)
-It was available both with a front panel with a bezel (with '[[Bootstrap|Boot]]', '[[Halt]]' and '[[LTC]] On' switches, and power and run status indicators); and also with a blank front panel (for use as an expansion box).
+It was available both with a front panel with a bezel (with '[[bootstrap|Boot]]', '[[Halt]]' and '[[LTC]] On' switches, and power and run status indicators); and also with a blank front panel (for use as an expansion box).
 It was a 5-1/4" tall mounting box, for the [[H960 rack|H960]] series of 19"-wide racks, one of the [[BA11 mounting boxes]]. 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 5-1/4" tall BA11-N mounting box was designed for these spaces.
@@ Line 16: / Line 16: @@
 The BA11-N's dimensions were 5-1/4" high, 19" wide, and 22-3/4" deep, and it weighed 44 lbs (without any boards). The rack mounting was 26-3/4" long.
 [[Category: DEC Hardware]]