Virtual Instruction Sets What Do They Buy You?

  • Virtual machine support (installed base!)

  • Multiple ISAs ("multi-lingual" processor)

  • Support for legacy code (e.g., MS-DOS)

  • Support for legacy hardware architectures (e.g., PC-AT)

  • Adding 64-bit ISA support is "easy" (new layer)

  • Protection from Intelís legal department?

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