So recently a relative was cleaning and found some NES and S-NES games with the consoles and accessories. They didn't want them but knowing I'm a gamer (or was) they asked me if I wanted them or they should just throw it all out. Of course I told them to send it, cant let the classics just get thrown out.

Fast forward to now when my nephew came over and wanted to do classic gaming. When attempting to set up both the NES and S-NES I found the AC adapter and controllers for both systems. However I seem to be missing the cords that send signal between the console and the TV. There was one block of grey plastic that screws into the TV and it looks exactly like the one on my old NES that did the conversion from channel 3 to the game system, but I am unsure if the S-NES had a similar grey block. Either way there seems to be no wire to plug into the second port on the game console that would send signal from the console to either the TV or the grey block.

Honestly I don't even know what this would be called to plug the keywords into ebay or what not to try to get one, for each system.

So if anyone knows the term for that wire and where I could buy one for each system that would be a great help so my nephew can do some classic gaming.

Thank you in advance.

EDIT: Based on the comments I need to have the RF-Modulator NUS-003(USA) and a new RF Switch. It looks like the RF switch (grey block) that was sent has the short cord that screws into the TV but is missing the long cord that plugs into the NES or the RF-Modulator that goes into the S-NES.

If anyone thinks I got this wrong let me know.

EDIT2: Ok more research from where I was led online got me to go up and try plugging in the colored cord into the S-NES. Then I went to the back of the TV (it is a newish one) to look why my grey brick didn't have the cord it should have. Lo and behold the missing cord was right there hanging down. I have no idea how both I missed it and my helpers didn't see it. From there I was able to get the NES to work by plugging that wire in. Then I tried to get the S-NES to work. Well I wanted to have everything plugged in at once so I wanted to leave the RF Switch in the NES and use the tri colored splitter for the S-NES. I unplugged the 5 colored splitter from my PS2 (I had to upgrade to 5 splits from 3 to make the picture on the PS2 work correctly) and plugged it into the S-NES. No dice it wouldn't send signal. So eventually I unplugged the RF Switch from the NES and put it in the S-NES to see if I could make it work. Yes now I has signal but everything was washed out and blurry and in a sick shade of dirty red. Seriously it looked like perfect special effects for a video game based creepy pasta. After trying to get it to work, I suddenly realized the 5 cord splitter was still plugged into the S-NES , and after quickly yanking that cord the color returned to normal. I'm dumb guys.

So I have working PS2, S-NES, and NES on one TV but not all at the same time.

Thank you for all the help!