Difference between revisions of "H777 Power Supply"
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| − | The '''H777 Power Supply''' is the [[power supply]] unit for the [[BA11-L mounting box]] from [[Digital Equipment Corporation|DEC]]. It provided [[direct current|DC]] [[current]] at [[voltage]]s of +5, +15 and -15V, with optional +20V/-5V for use with [[core memory]]. | + | The '''H777 Power Supply''' is the [[power supply]] unit for the [[BA11-L mounting box]] from [[Digital Equipment Corporation|DEC]]. It provided [[direct current|DC]] [[current]] at [[voltage]]s of +5, +15 and -15V, with optional +20V/-5V for use with [[core memory]]. An optional '''H775A Battery Backup Unit''' allowed provision of power to [[Metal Oxide Semiconductor|MOS]] [[main memory]] units mounted in the BA11-L, allowing their contents to be retained during brief power outages. |
| − | There are a large number of different | + | A combination of up to 3 [[printed circuit board|boards]] provided different combinations of output voltages: |
| + | |||
| + | * +5V Regulator - [[DEC part number]] 70-11073 or 70-12909 | ||
| + | * MOS Regulator, +/- 15V, +5VB - 54-11601 | ||
| + | * Core Regulator, +20V, -5V - 54-11599 | ||
| + | |||
| + | There are a large number of different models of the H777, but they boil down to a combination of three (later four) options: | ||
* 110V or 220V [[alternating current|AC]] input | * 110V or 220V [[alternating current|AC]] input | ||
* The optional +20V/-5V supply | * The optional +20V/-5V supply | ||
| − | * An upgraded +5V power supply ( | + | * An upgraded +5V power supply (70-12909) which produced 32 [[ampere|amps]] instead of the 25A of the original (70-11073) |
The fourth option (used in the [[PDP-11/24]] in the BA11-L box) provided +12V/-12V for use by its [[MS11-M MOS memory]] instead of the +15V/-15V. | The fourth option (used in the [[PDP-11/24]] in the BA11-L box) provided +12V/-12V for use by its [[MS11-M MOS memory]] instead of the +15V/-15V. | ||
| − | + | The models are: | |
| + | |||
| + | {| class="wikitable" | ||
| + | ! Model !! Input !! Regulators | ||
| + | |- | ||
| + | | -AA || 115 || 25A +5V, MOS and core | ||
| + | |- | ||
| + | | -AB || 230 || 25A +5V, MOS and core | ||
| + | |- | ||
| + | | -BA || 115 || 25A +5V, MOS only | ||
| + | |- | ||
| + | | -BB || 230 || 25A +5V, MOS only | ||
| + | |- | ||
| + | | -CA || 115 || 32A +5V, MOS and core | ||
| + | |- | ||
| + | | -CB || 230 || 32A +5V, MOS and core | ||
| + | |- | ||
| + | | -DA || 115 || 32A +5V, MOS only | ||
| + | |- | ||
| + | | -DB || 230 || 32A +5V, MOS only | ||
| + | |- | ||
| + | | -UA || 115 || 32A +5V, +/- 12V MOS only | ||
| + | |- | ||
| + | | -UB || 230 || 32A +5V, +/- 12V MOS only | ||
| + | |} | ||
| + | |||
| + | The -U variants also include a communication regulator, 54-13764, which provides +/- 15V. | ||
| + | |||
| + | The H777 does not use a [[power harness]]; rather, it has a 'power distribution board' which holds the usual [[DEC power distribution connectors]]; the [[backplane]](s) mounted in the BA11-L plug in there. | ||
The power distribution board also holds a connector for the usual DEC [[Remote Switching Control Bus]]; this could be used either as an output (on boxes which contained a front panel) or an input (for boxes used as expansion boxes). | The power distribution board also holds a connector for the usual DEC [[Remote Switching Control Bus]]; this could be used either as an output (on boxes which contained a front panel) or an input (for boxes used as expansion boxes). | ||
It was mounted longitudinally, at one side of mounting box, and included its own cooling fan. | It was mounted longitudinally, at one side of mounting box, and included its own cooling fan. | ||
| + | |||
| + | ==External links== | ||
| + | |||
| + | * [http://bitsavers.org/pdf/dec/unibus/EK-BA11L-TM-001_Oct77.pdf BA11-L mounting box technical manual] (EK-BA11L-TM-001) - the H777 is covered on pp. 14-19 and Chapter 3, pp. 36-80 | ||
| + | * [http://www.bitsavers.org/pdf/dec/pdp11/1124/EK-11024-TM-001_PDP11_24_System_Technical_Manual_Jun81.pdf PDP-11/24 System Technical Manual] - covers the communication regulator in Appendix A | ||
| + | * [http://bitsavers.org/pdf/dec/pdp11/1104/MP00019_1104_EngrDrws_Feb78.pdf 11/04 Engineering Drawings] - H777-0 Vol. 1 Field Maintenance Print Set (MP00016) is on pp. 104-142 | ||
| + | * [http://www.bitsavers.org/pdf/dec/pdp11/1124/MP01018_Rev_F_11-24_Engineering_Drawings_Mar84.pdf 11/24 Field Maintenance Print Set] - H777-0 Vol. 2 Field Maintenance Print Set (MP00309) is on pp. 169-194 | ||
[[Category: DEC Hardware]] | [[Category: DEC Hardware]] | ||
Revision as of 01:01, 15 January 2022
The H777 Power Supply is the power supply unit for the BA11-L mounting box from DEC. It provided DC current at voltages of +5, +15 and -15V, with optional +20V/-5V for use with core memory. An optional H775A Battery Backup Unit allowed provision of power to MOS main memory units mounted in the BA11-L, allowing their contents to be retained during brief power outages.
A combination of up to 3 boards provided different combinations of output voltages:
- +5V Regulator - DEC part number 70-11073 or 70-12909
- MOS Regulator, +/- 15V, +5VB - 54-11601
- Core Regulator, +20V, -5V - 54-11599
There are a large number of different models of the H777, but they boil down to a combination of three (later four) options:
- 110V or 220V AC input
- The optional +20V/-5V supply
- An upgraded +5V power supply (70-12909) which produced 32 amps instead of the 25A of the original (70-11073)
The fourth option (used in the PDP-11/24 in the BA11-L box) provided +12V/-12V for use by its MS11-M MOS memory instead of the +15V/-15V.
The models are:
| Model | Input | Regulators |
|---|---|---|
| -AA | 115 | 25A +5V, MOS and core |
| -AB | 230 | 25A +5V, MOS and core |
| -BA | 115 | 25A +5V, MOS only |
| -BB | 230 | 25A +5V, MOS only |
| -CA | 115 | 32A +5V, MOS and core |
| -CB | 230 | 32A +5V, MOS and core |
| -DA | 115 | 32A +5V, MOS only |
| -DB | 230 | 32A +5V, MOS only |
| -UA | 115 | 32A +5V, +/- 12V MOS only |
| -UB | 230 | 32A +5V, +/- 12V MOS only |
The -U variants also include a communication regulator, 54-13764, which provides +/- 15V.
The H777 does not use a power harness; rather, it has a 'power distribution board' which holds the usual DEC power distribution connectors; the backplane(s) mounted in the BA11-L plug in there.
The power distribution board also holds a connector for the usual DEC Remote Switching Control Bus; this could be used either as an output (on boxes which contained a front panel) or an input (for boxes used as expansion boxes).
It was mounted longitudinally, at one side of mounting box, and included its own cooling fan.
External links
- BA11-L mounting box technical manual (EK-BA11L-TM-001) - the H777 is covered on pp. 14-19 and Chapter 3, pp. 36-80
- PDP-11/24 System Technical Manual - covers the communication regulator in Appendix A
- 11/04 Engineering Drawings - H777-0 Vol. 1 Field Maintenance Print Set (MP00016) is on pp. 104-142
- 11/24 Field Maintenance Print Set - H777-0 Vol. 2 Field Maintenance Print Set (MP00309) is on pp. 169-194
