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segmented address space
Last modified: Tuesday, March 12, 2002 

An address space logically divided into sections, called segments. To access a particular memory location, a program must specify both the segment number and the offset within that segment. In contrast, a flat address space consists of simple memory addresses that start at 0 and increment to the maximum address.

Intel's 16-bit x86 architecture uses a segmented addressing model, and consequently so do DOS and older versions of Windows. Starting with 80386 microprocessor, however, the x86 architecture supports a flat addressing architecture. Newer versions of Windows, including Windows 95, Windows 98 and Windows NT, use a flat addressing scheme. The Mac OS has always used a flat addressing model.

In some cases, it's necessary to convert from one addressing model to another. This is called thunking.

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related categories

Memory

x86 Microprocessors

related terms

address space

Intel microprocessors

thunk


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