The Starpath Supercharger is a very interesting add-on for the Atari 2600. It was developed to reduce the cost of distributing games written for the system, but became much more than that. The idea was to create a cassette interface that allowed the loading of games into the Atari from a cassette player. Starpath succeeded, and while they were at it, they gave the Supercharger more storage space for game code than most of the Atari cartridge games had. Quicker turnaround time during game development and highly talented programmers.
Turnaround time is the amount of time between writing game code and testing it.
Don't get discouraged with this step. Try Radio Shack, they generally have the necessary adaptors. Now you need to get the proper program for loading the ROM images from the Internet. You can download Makewav for DOS and the Amiga and WPlayBin for Windows from my website. Follow the installation instructions for the program you will use.