Do you have 3rd party carts that won't fit properly into your 7800 or 2600? I've personally experienced on a few of my systems; this is why @winz_mod and I created the "Lock-On 2600", the Tight Cart Fix for 2600 games. No modding needed, just attach the Lock-On 2600 to your cart and plug it into your system. It couldn't be easier! This has been tested with many systems and the compatibility is stellar, see all the reviews in this very thread!
Each unit is $30 plus shipping. We HIGHLY