From the back of the book: Your name is Orion, and only you can stop the world from spinning wildly out of orbit! The world is headed for disaster! Tidal waves and earth quakes are only the beginning. As the computer whiz on the ACT (Adventure Connection Team) it's up to you to set the world back on course. You must use your micro to: Play a game of skill that tests your reflexes - and your nerve Break the enemy's secret code Debug an equipment malfunction before it sends your teammates plummeting to a sudden death Doom Stalker is more than a great adventure story. It's danger, action, and suspense - plus computer programs for you to run. This program will run in BASIC on the IBM PC, PC jr, APPLE II+, //e, COMMODORE 64, VIC-20, ATARI 400/800, RADIO SHACK TRS80 (Level 2 or greater), RADIO SHACK COLOR COMPUTER. Includes a reference manual with user tips and explanations of the programs!