Adapting ATX PSU to A2000

[orange]

since ATX PSU is smaller, I made 'feets' to fasten it. I also used tick generator (from aminet) instead of jumper and moved power switch.
iirc, some things don't work with jumper, like genlock.
have a look at my photo gallery.

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iirc, mostly people turn it on/off by connecting green (i think!) wire to black (GND). While its connected there is power. you could, in theory, keep it always shorted to GND, and simply use main switch. dunno if that's safe, but at least you'll save some electricity
 in some rare cases you might need to use gray wire instead of black.
anyway, check that Ians page first, its excellent, very informative.

I've also used this in A1200: http://aminet.net/package/docs/hard/AMI_ATX
its more complicated (pic programming), but has nice extra features.  

(don't forget that all switching PSUs need some load to work properly and all the usual stuff about electric shock hazard.)