Difference between revisions of "BA11-N mounting box"
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The '''BA11-N mounting box''' was the first [[mounting box]] used for the [[PDP-11/23]] from [[Digital Equipment Corporation|DEC]]. It included an H786 [[power supply]], 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 first [[mounting box]] used for the [[PDP-11/23]] from [[Digital Equipment Corporation|DEC]]. It included an H786 [[power supply]], and an H9273-A 9-slot [[QBUS#Backplane|Q/CD]] [[backplane]], which could hold [[DEC card form factor|quad-sized]] cards. | ||
| − | 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 | + | 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 H9273-A was a [[QBUS#Variable_address_size|Q18]] backplane, but it is relatively easy to [[upgrading QBUS backplanes|upgrade it to Q22]]. |
It was available both with a front panel (with '[[Bootstrap|Boot]]', '[[Halt]]' and '[[LTC]] On' switches), and with a blank front panel. | It was available both with a front panel (with '[[Bootstrap|Boot]]', '[[Halt]]' and '[[LTC]] On' switches), and with a blank front panel. | ||
Revision as of 02:21, 16 July 2018
The BA11-N mounting box was the first mounting box used for the PDP-11/23 from DEC. It included an H786 power supply, and an H9273-A 9-slot Q/CD backplane, which could hold quad-sized cards.
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 H9273-A was a Q18 backplane, but it is relatively easy to upgrade it to Q22.
It was available both with a front panel (with 'Boot', 'Halt' and 'LTC On' switches), and with a blank front panel.
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.
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).
