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To address a byte in a segmented model, a program uses an address called a logical address

Logical addresses are often referred to as pointers.

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Syntax

Segment-register:Byte-address

where:

• Segment-register is a segment selector that identifies the segment (Optional for some instructions that have a default)
• Byte-address is an offset that identifies a byte in the segment address space

Example

• The following segment address identifies the byte at address FF79H in the segment pointed by the DS register

DS:FF79H

• The following segment address identifies an instruction address in the code segment. The CS register points to the code segment and the EIP register contains the address of the instruction.

CS:EIP