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Saudi man earns world record for 444 game consoles hooked to one TV
(arstechnica.com)
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Meh, the answer is money. With money it's easy.
I mean with rf based consoles it's easy to just put a bunch of T's on the coax but HDMI would require a massive HDMI switcher.
If anybody is curious you can find a video of him showing what he uses
I'm interested
You could probably chain some smaller HDMI switches together. Not sure what the practical limit would be or when lag would get noticable, though.