Difference between revisions of "H765 Power System"
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The '''H765 Power System''' is a modular [[power supply]] system from [[Digital Equipment Corporation|DEC]], used in the [[BA11-K mounting box]]. In addition to [[main memory]] and [[device controller]]s on other [[PDP-11]]'s, the BA11-K was used to hold [[PDP-11/04]] and [[PDP-11/34]] [[Central Processing Unit|CPU]]'s. | The '''H765 Power System''' is a modular [[power supply]] system from [[Digital Equipment Corporation|DEC]], used in the [[BA11-K mounting box]]. In addition to [[main memory]] and [[device controller]]s on other [[PDP-11]]'s, the BA11-K was used to hold [[PDP-11/04]] and [[PDP-11/34]] [[Central Processing Unit|CPU]]'s. | ||
| − | + | A 5411086 board in the H765 supplies a modest amount of +15V [[Direct current|DC]] power to various [[backplane]]s mounted in the BA11-K, along with a [[line time clock]] signal, and [[Alternating current|AC]] and DC 'power OK' signals. | |
It also supplies 20-30V AC to several [[DEC standard modular regulators]] (up to four, in spaces numbered '1' through '4') mounted in the H765, which provide other voltages such as +5V to the backplanes in the mounting box. | It also supplies 20-30V AC to several [[DEC standard modular regulators]] (up to four, in spaces numbered '1' through '4') mounted in the H765, which provide other voltages such as +5V to the backplanes in the mounting box. | ||
Revision as of 17:50, 6 June 2019
The H765 Power System is a modular power supply system from DEC, used in the BA11-K mounting box. In addition to main memory and device controllers on other PDP-11's, the BA11-K was used to hold PDP-11/04 and PDP-11/34 CPU's.
A 5411086 board in the H765 supplies a modest amount of +15V DC power to various backplanes mounted in the BA11-K, along with a line time clock signal, and AC and DC 'power OK' signals.
It also supplies 20-30V AC to several DEC standard modular regulators (up to four, in spaces numbered '1' through '4') mounted in the H765, which provide other voltages such as +5V to the backplanes in the mounting box.
Generally the power harness supports only a fixed arrangement as to which regulator can be in which spaces; e.g. the BA11-K harness mandates that #2 and #3 hold H744 +5V Regulators, #1 holds an H745 -15V Regulator, and #4 may hold an H754 +20V, -5V Regulator.
When the BA11-K is used in custom configurations to hold systems (such as the MJ11 memory system and MK11 memory system), other regulator configurations may be used, along with a custom harness; e.g. the MJ11 calls for two H744's and two H754's.
The harness used DEC power distribution connectors to provide power to standard backplanes; it normally used the DEC standard power wire colour coding.
The H765 supported the standard DEC Remote Switching Control Bus, so it could be turned off and on from a power switch elsewhere.
