Difference between revisions of "BA11-N mounting box"
(Copyedit) |
m (Clarity, typo) |
||
| 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#Backplane|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]] (which provided 22A of +5V, and 11A of +12V; although some sources give 15A and 8A respectively); and an H9273-A 9-slot [[QBUS#Backplane|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]]. | ||
| − | 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. | + | 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 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 this | + | 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]].) |
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). | ||
| Line 12: | Line 11: | ||
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. | 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. | ||
| − | For rack mounting purposes. it did not use external slides (as all the other BA11 mounting boxes did); instead, it was housed in an external 'skin' | + | For rack mounting purposes. it did not use external slides (as all the other BA11 mounting boxes did); instead, it was housed in an external 'skin' (termed a 'logic box cover' in DEC documentation, the base unit being called a 'logic box') into which it is slid; the cover would be bolted to the rack. |
The backplane was mounted vertically, facing backward (unlike the BA11-M mounting box, where they had been facing forward). Cooling fans mounted on the side of the BA11-N passed air both over the boards, and through the power supply. | The backplane was mounted vertically, facing backward (unlike the BA11-M mounting box, where they had been facing forward). Cooling fans mounted on the side of the BA11-N passed air both over the boards, and through the power supply. | ||
Revision as of 01:37, 17 July 2018
The BA11-N mounting box was the a mounting box used for QBUS PDP-11's from 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 Q/CD backplane, which could hold quad-sized cards.
The H9273-A was a Q18 backplane, but it is relatively easy to 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 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 it was a Q/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 right-hand C/D connectors. (The only DEC card with a problem with this seems to have been the MMV11-A.)
It was available both with a front panel with a bezel (with '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 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.
For rack mounting purposes. it did not use external slides (as all the other BA11 mounting boxes did); instead, it was housed in an external 'skin' (termed a 'logic box cover' in DEC documentation, the base unit being called a 'logic box') into which it is slid; the cover would be bolted to the rack.
The backplane was mounted vertically, facing backward (unlike the BA11-M mounting box, where they had been facing forward). Cooling fans mounted on the side of the BA11-N passed air both over the boards, and through the power supply.
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.
| v • d • e PDP-11 Computers and Peripherals |
|---|
| UNIBUS PDP-11s - PDP-11/20 • PDP-11/15 • PDP-11/35 • PDP-11/40 • PDP-11/45 • PDP-11/50 • PDP-11/55 • PDP-11/70 PDP-11/05 • PDP-11/10 • PDP-11/04 • PDP-11/34 • PDP-11/60 • PDP-11/44 • PDP-11/24 • PDP-11/84 • PDP-11/94 QBUS PDP-11s - PDP-11/03 • PDP-11/23 • PDP-11/23+ • MicroPDP-11/73 • MicroPDP-11/53 • MicroPDP-11/83 • MicroPDP-11/93 QBUS CPUs: LSI-11 • LSI-11/2 • KDF11-A • KDF11-B • KDJ11-A • KDJ11-B • KDJ11-D • KDJ11-E Buses: UNIBUS • UNIBUS map • SPC • MUD • EUB • QBUS • CD interconnect • PMI Also: PDP-11 architecture • PDP-11 Extended Instruction Set • FP11 floating point • PDP-11 Memory Management |
| UNIBUS CPUs: KA11 • KC11 • KB11-A • KB11-B • KB11-C • KB11-D • KD11-A • KD11-B • KD11-D • KD11-E • KD11-EA • KD11-K • KD11-Z • KDF11-U
Co-processors: FP11-A • FP11-B • FP11-C • FP11-E • FP11-F • KE44-A • FPF11 Chips: LSI-11 • KEV11-A • KEV11-B • KEV11-C • F-11 • KEF11-A • KTF11-A • T-11 • J-11 • FPJ11 CPU options: KE11-E • KE11-F • KJ11-A • KT11-C • KT11-D • KK11-A • KK11-B • KT24 • KTJ11-B Rare CPU options: KS11 Memory Protection and Relocation option • KT11-B Paging Option • KUV11 Writeable Control Store Front panels: KY11-A • KY11-D • KY11-J • KY11-LA • KY11-LB • KY11-P More on buses: UNIBUS and QBUS termination • Bus Arbitration on the Unibus and QBUS • CTI BUS PDT-11s - PDT-11/110 • PDT-11/130 • PDT-11/150 CTI PDP-11s - PRO-325 • PRO-350 • PRO-380 Other: FIS floating point • PDP-11 Commercial Instruction Set • PDP-11 stacks • PDP-11 family differences |
