H777 Power Supply
There are a large number of different versions, 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 (7012909) which produced 32 amps instead of the 25A of the original (7011073)
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.