MP 1,1-5,1 cMP PSU 3,1 vs. 4,1/5,1? Different voltages?

[Oldmopars]

I have 5 cMPs I got used. 3 are 3,1 and 2 are 4,1. I have 2 of them running MAC OS, one is a MATX converted PC. The other 2 I am still working on.
I just pulled out the PSU from a 3,1 and noticed that it is different than the 4,1. The 4,1 seems to only supply 12V, However the 3,1 seems to have a 12V, 5V and a 3.3V just like the PC ATX PSU.
I found this picture from another forum, the 3,1 PSU pinout (no idea its origin) and looking at the Pixlas mod and other info, this is what I have found.

I just want to confirm I am getting the right info.

And a question. What is "White Key" and does the PS_ON short to GND to power on the PSU just like a PC?


Is this correct?

 

[reader50]

A "key" in a connector is usually a plastic protrusion occupying one of the pin locations, to make that connector unique. To prevent a plug intended for one socket from being inserted into a wrong socket. Or to prevent a plug being inserted upside-down.

I've also seen sockets where one or more of the pin locations switch between "O" shapes, "D" shapes, or square shape. It's a simple way to avoid simple assembly errors. This is the reason for gaps in PCI card connectors, to prevent incompatible cards from being inserted into slots.

Having never worked on a 3,1 I'll leave the rest of your questions to others.

 

[Oldmopars]

Thanks, as it turns out, my plan is not going to work. The 5VDC power is too low to be of any value. I had hoped to use a Mac Pro PSU as an ATX PSU, but the demands of the 5VDC are way higher than the cMP PSU can provide.