Not too long ago I purchased a new 450 watt power supply to replace the very aged supply in the Heatwave BBS geneve system. While reading up on using ATX supplies for bench use (e.g., for repair testing) and low current draws (since I am installing switching regulators in some of my cards) I came across some references to newer supplies needing a higher load to activate and properly regulate power. I have not figured out what this means for my supply but it is certainly information to tuck away for later.
I inspected my new power supply and realized that the manufacturer used black wires for everything. There is no color coding! Argh. Not wanting to chop the connector without a way to test the pinouts (and validate my work without blowing something up in the process) I poked around for a visual solution. I first came across some bench conversion kits. They sounded nice but the comments and manufacturing origin made me skeptical of the quaility. I then happened across a color-coded extender cable that looks like it might do the trick:
I purchased two of these cables. My plan is to cut the proper end, tie the ground, +5, and +12 together, and then connect the +5, +12, -12, ground wires to the TI PEB backplane. This should allow me to easily swap out power supplies in the future, if needed.
The only thing that isn't clear to me right now is what happens if the power supply has more than one 12v or 5v rail. Do all of the 20/24 pin connector voltages come from the same rail and does it even matter? Anyway, I hope to receive the cables by the end of the week so that I can start updating my system.