sentences:  Apple's second, cost-reduced effort, the Macintosh, barely succeeded (by ditching the virtual memory, implementing it in software, and using commodity microprocessors) - and was not their most profitable product in the late 1980s.Apple also struggled to make profits on office system software in the same time period.L Peter Deutsch, one of the pioneers of the Postscript language, finally found a way to achieve Xerox-Star-like efficiency using just-in-time compilation in the early 1990s for bitmap operations, making the last bit of Xerox-Star custom hardware, the BitBLT, obsolete by 1990.