Booster (19xx)(Cosmic Cockerel) ROM Download can be obtained free for Sinclair ZX81 on EmuGames.net only. Play emulator game in English for the USA region. Booster is a Sinclair ZX81 ROM that you can download to your computer or play online within your browser. You can also download roms such as GameBooster 64 V1.1 and Dragon Booster that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.