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Sierra Entertainment was founded in 1979 as On-Line Systems in Los Angeles, California by Ken and Roberta Williams after Ken Williams, a programmer for IBM, bought an Apple II microcomputer which he planned to use to develop a FORTRAN compiler for Apple computers. At the time, his wife Roberta Williams was playing text adventure games for the Apple II. Dissatisfied with the adventure games that existed at the time, she realized modern computers could display graphics and had the potential to do more than presenting text descriptions on the screen. By 1982, On-Line Systems was renamed Sierra On-line and moved to Oakhurst, California.