Mario Bros. XE ROM Download for Atari 800 on Emulator Games. Play Mario Bros. XE game that is available in the United States of America (USA) version only on this website. Mario Bros. XE is a Atari 800 emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Mario Bros. (1983)(Nintendo), Pong.xex and Mario Bros. 2007 as shown below. Mario Bros. XE works on all your devices in high quality.