H750 (PDP-11) power on?

John> I do need some definmitions. John> Power controller? Same as a power supply? This one has the John> PSU on the right side with no obvious switches that I've yet John> found (maybe I have to change my definition of obvious). John> Breaker as I said is a just a small button, or, it's hidden John> under a cover somewhere... more looking. No, a power controller is a device you'll find in the larger DEC systems. Typically it's a separate rackmount box, found in the bottom of the back of the chassis. It distributes power to the various components in the rack, and contains circuit breakers and power sequencing relays. Look for something with a power inlet and a half dozen outlets on it, plus a 4?-wire plastic plug which is the sequencing control. The idea is that you'd hook all the power controllers together, and then the CPU power key would control all the power in the system even if it has multiple racks with multiple power inlets. paul