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Virtual Memory systems increase the effectively available amount of RAM using Disk Swapping . The quality of the virtual memory manager can have a big impact on overall system performance.

Garbage Collection is the automated allocation and deallocation of computer memory resources for a program. This is generally implemented at the programming language level and is in opposition to Manual Memory Management , the explicit allocation and deallocation of computer memory resources.

In addition to standard memory management, DOS led to the development of programs known as Memory Manager s. These move portions of the operating system outside their normal locations in order to increase the amount of memory available to other applications. Examples are EMM386 , which was part of the standard installation in DOS's later versions, and QEMM . These allowed use of memory above the 640 kb barrier, where memory was normally reserved for ROMs, and high and upper memory.

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