QEMM

Quarterdeck Expanded Memory Manager (QEMM) is a memory manager produced by Quarterdeck Office Systems in the late 1980s through late 1990s. It was the most popular third party memory manager for the MS-DOS and other DOS operating systems.

QEMM product ranges

Competitors

The principal competitors of QEMM were BlueMax/386MAX, and HeadRoom/NetRoom from Helix Software Company.

Compaq DOS 3.31, released in November 1987, was the first DOS operating system to bundle technology similar to QEMM-386, incorporating a 386-mode EMS manager called CEMM. QEMM was the first V86 memory manager on the market.

Features/tools

QEMM driver

QEMM provides access to the Upper Memory Area (UMA) and memory through the Expanded Memory Specification (EMS), Extended Memory Specification (XMS), Virtual Control Program Interface (VCPI) and DOS Protected Mode Interface (DPMI).