Multimedia applications place new demands upon processors, networks and operating systems. While some network designers, through ATM for example, have considered revolutionary approaches to supporting multimedia, the same cannot be said for operating systems designers. Most work is evolutionary in nature, attempting to identify additional features that can be added to existing systems to support multimedia. Here we describe the Pegasus project's attempt to build an integrated hardware and operating system environment from the ground up specifically targeted towards multimedia. 1 Introduction Since the invention of electronic computers in the forties, every decade has been characterized by new ways in which they were used. In the fifties, people used sign-up sheets to reserve the computer for an hour's work; in the sixties batch processing was introduced; time sharing became pervasive in the seventies; the PC and networking came in the eighties; and now, in the nineties, we see the in..
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