When you power on a typical multicart, you're greeted not by a game but by a . This menu is itself a hacked ROM stored in the cartridge's memory. When you select a game, the menu triggers the mapper chip to reconfigure the banking setup, loading the selected game's data into the memory window. Pressing the reset button often returns you to the menu, allowing you to choose another game.
The r/Roms Megathread on Reddit is a curated resource for finding specific "GoodNES" or "No-Intro" sets that include multicart collections. 99999 in1 nes rom download top
You can find digital versions of these collections on platforms like the Internet Archive . When you power on a typical multicart, you're