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4. Real Mode Segmented Model, Cont.

  • Addresses are limited to 20 bits:

    • 220=1,048,576 bytes.

  • Physical address is generated by adding a

    • 16-bit segment register, shifted left four bits

    • plus a 16 bit-offset.

  • Generating 20-bit physical address in Real Mode:

      Generating 20-bit address in Real Mode

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