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Quarterdeck Expanded Memory Manager (QEMM) is a memory manager produced by Quarterdeck Office Systems in the late 1980s through the late 1990s. It was the most popular third-party memory manager for the MS-DOS and other DOS operating systems .
Quarterdeck Expanded Memory Manager, DESQview, DESQview/X Quarterdeck Office Systems , later Quarterdeck Corporation ( NASDAQ : QDEK), was an American computer software company. It was founded by Therese Myers [ 1 ] [ 2 ] and Gary Pope in 1981 [ 3 ] and incorporated in 1982.
Owing to the foresight of its marketing manager, Quarterdeck marketed it as a separate product, QEMM-386 (Quarterdeck Expanded Memory Manager 386). It became more popular than DESQview itself, and sold steadily for many years, generating over US$150 million in sales from 1987 through 1994.
Expanded memory is an umbrella term for several incompatible technology variants. The most widely used variant was the Expanded Memory Specification (EMS), which was developed jointly by Lotus Software, Intel, and Microsoft, so that this specification was sometimes referred to as "LIM EMS". LIM EMS had three versions: 3.0, 3.2, and 4.0.
Expanded memory managers such as Quarterdeck's QEMM product and Microsoft's EMM386 supported the expanded memory standard without requirement for special memory boards. On 386 and subsequent processors, memory managers like QEMM might move the bulk of the code for a driver or TSR into extended memory and replace it with a small fingerhold that ...
Quarterdeck can refer to: Quarterdeck, part of a warship; Quarterdeck Office Systems. Quarterdeck Expanded Memory Manager; Quarterdeck Mosaic; Quarterdeck DESQview/X 2.0; Quarterdeck Cleansweep; Quarterdeck Investment Partners, Inc. Quarterdeck Ridge
Two people experiencing homelessness, Tonya and Troy, vacate private property being used as a homeless encampment with the assistance of New Philadelphia Police officers on April 5, 2024, in New ...
Developed since 1987 in cooperation with Quarterdeck Office Systems and with support by A.I. Architects, Lotus Development Corp., Quadram, Qualitas and Rational Systems, VCPI is provided by an expanded memory manager in DOS (e.g. CEMM, QEMM, later EMM386) and does allow 80386 protected-mode DOS extenders to coexist with 80386 EMS expanded memory emulators.