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Case 1: Full-width address given:
Upper half is used as an index into the gdt, lower half is used as an offset within the segment
Case 2: Less than full width address given, segment selector specified:
Fills missing bits of a full-width address with the high bits of the specified segment selector, then processes as in case 1
Case 3: Less than full width address given, no segment selector specified:
Same as case 2, but uses upper half of IP for instructions implicitly modifying IP, and SS0 otherwise, as the segment selector
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