The Advance Movie Adapter is a special GBA cartridge that allowed users to play videos from SmartMedia cards. It's kind of like the GBA Video Cartridges by Majesco, except it arguably has better compression and quality.
Been messing around with improving emulation for it in GBE+ recently. Fun fact, some of the videos are protected from playing on the GB Player for the GameCube (mostly Pokemon videos as far as I know). They have this custom error screen if it detects the GB Player.




