Dual - SNES to NES Controller Mod - Click image to enlarge.
Sega Genesis Model 1 to 32x Connection Cable - Click image to enlarge.
How to make a F-Type Male to RCA Female Adapter with spare parts around the house for your Atari 2600.
What you need:
Any cable that has a Female RCA end. I used a RCA Male To Dual RCA Female Cable I have a ton of these for some reason.
Coaxial Cable like the kind you get from your cable company.
Electrical Tape or Heat-shrink Tubing.
The end result.