[PDF] concept of physical address formation in 8086

The 8086 addresses a segmented memory. The complete physical address which is 20-bits long is generated using segment and offset registers each of the size 16-bit. The content of a segment register also called as segment address, and content of an offset register also called as offset address.
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  • What is the physical address space of 8086?

    All internal registers, as well as internal and external data buses, are 16 bits wide, which firmly established the "16-bit microprocessor" identity of the 8086.
    A 20-bit external address bus provides a 1 MiB physical address space (220 = 1,048,576 x 1 byte).

  • What is the physical address space of 8086?

    The basic difference between Logical and physical address is that Logical address is generated by CPU in perspective of a program whereas the physical address is a location that exists in the memory unit.

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