Note: There were five versions: Timex-Sinclair 1000; VIC-20; TI-99; Atari; Commodore 64. The Timelost series of books were the first-ever combination SF/comic/computer-gaming/tutorial publications. At a crucial point in the story, the reader was referred to a program listing that showed how to construct the game to be played (typically a "zap-em" fight scene). Each line of the listing was explained, with instructions on how to vary the game parameters: colors, number of combatants, speed of play, etc. Each of the first PCs was covered. A second book in the continuing adventure was written and produced in 1984, but sales in the market declined that year and the publisher, Que Corporation, did not market the books or fulfill certain other obligations owed the authors.