Hello all,

I recently got an ATX to AT PSU converter, which provides 2 loose wires (COM + PS_ON) so one can control the ATX PSU On/Off. Before doing something stupid I would like an advice to double-check if I understand the behaviour correctly. From https://en.wikipedia.org/wiki/PS-ON_Signal and as far as I remember:

- PS_ON is a high signal when the PSU is Off
- If one wants to start the PSU, PS_ON has to be connected to COM

Now this is usually done through the mainboard on an ATX system by pressing the power button for a short period of time. From what I understand, an ATX mainboard uses this signal (or a long press to shut the PSU down) to connect/disconnect PS_ON an COM permanently (and not just a short burst corresponding to the button press).

So going back to my ATX to AT adapter, can I just take a switch to connect these 2 wires together or do I need some kind of additional resistor between them?