CQ:
You don't really need a realy to do this. Just a SPST switch. Hook-up the ground wire and one of the 120V AC wires of the AT PSU to the ATX 120V input or whatever...
Then the one remaining 120V AC wire for the AT PSU can just be run through the switch.
Of course, with this setup, you'd need to flip the switch to turn the AT supply on.
If you're wanting it to be automagic, then you'll need to do something like run that last 120V AC wire through a relay. The relay could be activated by the ATX 12V or 5V ouputs....so, whenever the ATX PSU turns ON, the 12V or 5V lines become active. This is turn energizes the relay which then gives the AT PSU the second leg of the 120V AC it needs to turn on.
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