z/Architecture Overview

• 64 bit addressing

  • 24 bit support
  • 31 bit support
  • Up to 3 levels of �Region Tables� to give:
    • 42, 53, 64 bit addressing
  • Use samxx instruction to switch addressing modes

• New term:

  • >16MB = �above-the-line�
  • >2GB = �above-the-bar�

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