Search results
Results from the WOW.Com Content Network
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 .
The Expanded Memory Specification (EMS) is the specification describing the use of expanded memory. EMS functions are accessible through software interrupt 67h. Programs using EMS must first establish the presence of an installed expanded memory manager (EMM) by checking for a device driver with the device name EMMXXXX0.
EMM386 is the expanded memory manager of Microsoft's MS-DOS, IBM's PC DOS, Digital Research's DR-DOS, and Datalight's ROM-DOS [1] which is used to create expanded memory using extended memory on Intel 80386 CPUs. There also is an EMM386.EXE available in FreeDOS. [2]
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 ...
The extended memory manager is also responsible for managing allocations in the high memory area (HMA) and the upper memory area (UMA; also referred to as upper memory blocks or UMBs). In practice the upper memory area will be provided by the expanded memory manager (EMM), after which DOS will try to allocate them all and manage them itself.
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.
CEMM, for Compaq Expanded Memory Manager was the first so-called PC "memory manager" for Intel 80386 CPUs, able to provide expanded memory (EMS) emulation by using the virtual memory features and the virtual 8086 mode of the CPU. It was present in Compaq DOS 3.10, shipping with the Compaq Deskpro 386 in September 1986. [1] [2]
Memory manager may refer to: Memory management, a form of resource management applied to computer memory; Memory management unit, primarily performing the translation of virtual memory addresses to physical addresses; DOS memory management. Expanded memory manager (EMM) Extended memory manager (XMM) HIMEM.SYS