I noticed this product has dual outputs, not just a switchable end connector. I was wondering if anyone uses these to run their SNES and floppy copiers.
http://www.innexinc.com/product_detail.php?prod_id=RB-UNI-1361&brand=65&page_num=3
Power rating seems too low (850mA max...)
A friend of mine bought one of those, and it didn't work at all with his SNES. It did work with his NES, so we suspect it did not provide enough power.
Nintendo's SNES power supplies are rated for 850mA at 10V DC.
You could always make one. Get a decent 9-12V adapter with a couple amps worth of current, and splice the cables on.
These twin-tail power supplies are absolutely awful. The retro game shop I worked at last summer carried them, and they weigh almost nothing. Their output goes totally haywire under load; it gets so unstable that if it even works an SNES will develop a slow-scrolling horizontal rainbow band that goes up and down the screen. The output is so dirty that it screws up NTSC encoding.
I would routinely chop off the connectors and solder together new power supplies with better wall-warts lying around that had no future.
This model can not be trusted to power one system, let alone another. However, the idea is sound, and if you had the connectors on a beefier power supply, it would probably be okay.
You could use a PC Power Supply's +12v rail if you brought it down closer to +9v and have plenty of amperage to power your SNES and Copier. Though I've heard to get a ATX psu to work at closer to its maximum output you may need a shunt on the 3.3v line but that's beside the point. PC power supplies can provide huge amounts of power. Easily enough to power what you need.
I'd stay away from cheap power supplies/wall wart power bricks because a bad PSU could cause serious issues.
I should have looked at it a little closer, I didn't realize it was low amp.