Atari 7800 also had some unique new ideas. Originally Atari were supposed to release an accessory called High Score Cartridge. It would save your high score to battery in supported games, with each game intended to launch in 1984 having such functionality already programmed in. After the console got delayed by two years, this idea was scrapped, but the High Score Cartridge got revived later by fans and it is easily available in emulators. Many new homebrew games support it as well.