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Every byte of memory, accessible by program, is assumed to reside in a segment.
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Segment size varies and can range from 1 byte to 64 Kbytes.
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Nothing is protected within a segment in Real Mode.
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Segments can overlap.
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Initializing the data segment register in 16-bit real mode:
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Numerical (immediate) values cannot be moved directly into the segment register. It is a 2-step process:
mov ax, 1000h mov ds, ax
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Initializing the data segment register:
