So yeah i want to make a SNES and N64(and ps2 someday) input displays my self since well they cost a bit and shipping costs a bit but my problem is i dont exactly know how to make the input display.

i know you need an arduino or similiar, an extension cable and the nintendospy code thing. is there a video tutorial or something out there?

I think the SM64 community has a tutorial to make an n64 input display but im not exactly sure.

You’re going to need experience in soldering wires for one thing since you need to splice the extension cable and get it onto the Arduino and splitting between the actual output and the USB cable. Of course the Arduino needs all the right firmware and everything as well (plus I would recommend RetroSpy as it’s much better than NintendoSpy and it supports non-Nintendo controllers).

If you’re capable of that type of electrical work, then I would start here: https://retro-spy.com/wiki/retrospy-hardware-selection/

That site is the main hub for all RetroSpy information. There you can see what hardware is supported (Arduino and Teensy 3.5) and if you click on the console link under the hardware you wish to work with, you’ll see all of the required equipment you need (ie. The RetroSpy cable - pre-made or home-made, the firmware, etc) and some step by step instructions on what to do, solder, all that.

okay update: i managed to make the N64 input display by following the link that @Timmiluvs gave me