What Is Extended Memory?
Extended memory is the part of RAM that is higher than 1MB. Most software that uses extended memory (such as the windows operating system) requires that the extended memory must be controlled by xmm.
Extended memory
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- Chinese name
- Extended memory
- Foreign name
- Expanded memory
- Management norms
- Appears after extended memory management specifications
- Way of working
- Two memories
- Extended memory is the part of RAM that is higher than 1MB. Most software that uses extended memory (such as the windows operating system) requires that the extended memory must be controlled by xmm.
- In the microcomputers above 386 grades, there are two memory working modes, one is called real address mode or real mode, and the other is called protection mode. In real mode, the physical address still uses 20 bits, so the maximum addressing space is 1MB for compatibility with 8086. The protection method adopts 32-bit physical address, and the addressing range can reach 4GB. The DOS system works in real mode, and the memory space it manages is still 1MB, so it cannot directly use extended memory. To this end, Lotus, Intel, AST and Microsoft have established standards for the use of extended memory under MS-DOS, namely the extended memory specification XMS. The Himem.sys we often see in the Config.sys file is the driver that manages extended memory.
- The extended memory management specification appeared later than the extended memory management specification.