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Yeah, I've been thinking/ looking around.

thinking of routing power through USB and using a separate D-sub 25 to USB for both SNES and NES controllers.

Should I make two different units for SNES and NES controllers. Or could I make a housing unit and route all four controllers through one D-sub ...

Is there any reason why I wouldn't be able to over come that with software?(The usb could simply pass the signals correct?)

Or should I just skip that idea and go with a USB powered, DB25 parallel port solution?

Pretty new to this whole thing, so probably throwing out some dumb questions, oh well.

From looking at the NES controller chip pinout and USB wiring, why do things like RetroUSB and other "NES to USB" adapters need so much extra stuff.

USB uses the same +5V, has a GND, and Data +/-

Only foreseeable hiccup is driver software.

Wouldn't you just connect corresponding wires?

And would ...