2-in-1 JAMMA switcher - tapping the harness for the 5dvc?

Tornadoboy

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2-in-1 JAMMA switcher - tapping the harness for the 5dvc?

I've got one of those common $50 2-in-1 JAMMA switchers like available here:

http://www.jammaboards.com/store/2-in-1-multijamma-switcher-pcb-gbs-8118-gbs-8118.html

It uses +5vdc to function and I was wondering, is it a bad idea to just get that by putting some jumpers and getting it right off the incoming JAMMA harness?

On the face of it I can't see why not but I also wonder why they simply didn't make it that way to begin with, so maybe there's something I'm not getting?
 
Not sure. I have one of those and it went dead. Should I see if someone can fix it or shouldn't I bother (not worth the effort or money)?
 
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