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QEMM, the Quarterdeck Expanded Memory Manager by Quarterdeck , was a popular memory manager for the DOS operating system. QEMM provides access to the Upper Memory Area (UMA) , Expanded Memory Specification (EMS) memory and Extended Memory Specification (XMS) memory. Many DOS programs required a high amount of conventional memory, and QEMM helped to increase the amount of free conventional memory by loading programs to the UMA. Many programs, such as Lotus 1-2-3, early version of Microsoft Windows, and many games, also used the EMS and XMS memory.

Originally, it was called QEMM386, and had a complementary product called QRAM that worked in a similar manner on 286's that had some specific Chips and Technologies chipsets. The 386 was dropped when the Intel Pentium was released. QEMM386 and DESQview that were shipped as a bundle were called DESQview386.

The principle competitors of QEMM were BlueMax / 386Max , and HeadRoom / NetRoom .

Beginning with version 5.0, MS-DOSMicrosoft's disk operating system, MS-DOS was the first popular operating system for the IBM PC. It was originally released with the PC in 1981 and had seven major versions before Microsoft stopped development in 1995. It was the key product in Microsoft' started to include a memory manger of its own called EMM386 . In some situations, EMM386 was good enough, but QEMM still usually freed up more conventional memory than EMM386 did.

While popular when DOS programs were the mainstream, QEMM eventually became irrelevant as Windows programs replaced DOS programs. Versions of QEMM were released into the era of Windows 98Windows 98 ( codename Memphis is a graphical operating system released on June 25, 1998 by the Microsoft Corporation. The new operating system was essentially an updated version of Windows 95, and like that earlier version, it was a hybrid 16-bit/ 32-bit, also being compatible with it.

System softwareSystem software is a generic term referring to any computer software whose purpose is to help run the computer system. Most of it responsible directly for controlling, integrating, and managing the individual hardware components of a computer system.

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