Back in the 90’s, when Sega Genesis was released, people starts selling their Sega Master console to get the new console. But they unable to play their Sega Master games on the Genesis. To solve the issue, Sega introduces the Sega Power Base Converter which allows players to play their old purchased games. Gaming Historian has the story.
Gaming Historian gives an overview / review on the Sega Power Base Converter, an accessory for the Genesis that let you play Sega Master System games! This allowed Sega to brag that their system was backwards compatible.