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Use ATX power supply?

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DaOld Man:
Anyone thought about using the 5 VDC from an ATX computer power supply to power the Pi?

I know that PS is about 10 times bigger than the Pi, but if you have a lot of room in your project, maybe it could be used?

Slippyblade:
That would work just fine.  Volts is volts.  You can run the Pi off a USB port, though that is a little light on amps.  I, personally, have about a dozen device charger wall warts in my bit-box though, so I've not had an issue with powering the little guy.

DaOld Man:
Im thinking with an ATX power supply, one might be able to rig up an on/off switch, similar to the mausberry circuit switch.

pcguysam:
If you want to get fancy:
http://www.robotshop.com/en/on-off-power-supply-switch-raspberry-pi.html?gclid=Cj0KEQjw4NmvBRCRp_yu2bzal4YBEiQAWfjpJnxDkquqCBu5AKfz4IqXD2Ks2y153_CQe6VVVopRw9EaApq78P8HAQ

Or if you don't:
http://www.amazon.com/JBtek-Raspberry-Micro-Cable-Switch/dp/B00JU24Z3W/ref=sr_1_1?ie=UTF8&qid=1442240261&sr=8-1&keywords=raspberry+pi+on+off+switch

obcd:
So, you want to use a 60 euro or dollar supply to power a 30 euro or dollar pi.
It won't be very economical, as the supply efficency will be low when it's only used for 1% of it's expected load.
Pc motherboards check their supply voltages and activate a power_good signal that turns the supply off if those voltages are not within limits.
You will still need the micro usb connector to power the pi or you will need to power it using the gpio lines, bypassing the polyfuses.
Some power supplies need a minimum load to work properly. Your Pi just might not be enough as load.

For emulation, an old x86 pc will still give a better performance than a raspberry pi. So, if you have the room, just stick in the pc. It will have decent "audio out" (out of the box) and will connect directly to that old analog vga screen you intend to use for your arcade project. It will have 40Gig of storage space out of the box (no need to buy a 4 gig sdcard) and might come with keyboard and housing.

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