Just bust out your multimeter on the power button on your case and see
what it does.  I think it just brings that signal low for 4 seconds
(that setting is in BIOS).

If you wanted to really half-ass it, you could probably just replace the
mechanical button with a small relay switch driven by your PIC (with
Transistor & diode).

It would be really easy to make your PIC toggle your computer on and off
whenever you point ANY remote control at it and press ANY button.

Good luck, cheers.

Marc wrote:

> Hi all...
>
> Best I can make out, to trigger power-on on an ATX motherboard, you need
> to pull to TTL low momentarily? Anyone vouch for this?
>
> Is decoupling or anything else required on this signal path? My goal is
> to control on/off of an ATX PC (and power supply) via a PIC and IR.
>
> TIA,
>
> -marc
>
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