Что (кто) такое Expanded Memory Specification - определение

SYSTEM OF BANK SWITCHING IN DOS MEMORY MANAGEMENT

Expanded Memory Specification; Expanded Memory System; Expanded Memory; LIM EMS; EMS memory manager; EMS emulator; EEMS; Expanded storage; Expanded memory manager; Expanded Memory Manager; Lotus-Intel-Microsoft; EMMXXXX0; Enhanced Expanded Memory Specification; Enhanced EMS; EMS (memory management); EMS 3.0; EMS 3.2; EMS 4.0; Expanded Memory Specification 3.0; Expanded Memory Specification 3.2; Expanded Memory Specification 4.0; EEMS 3.2; EEMS 3.1; Enhanced Expanded Memory Specification 3.1; Enhanced Expanded Memory Specification 3.2; AQA 3.1; AST Quadram Ashton-Tate; AST/Quadram/Ashton-Tate; AST-Quadram-Ashton-Tate; LIM 3.0; LIM 3.2; LIM 4.0; LIM Expanded Memory Specification; AQA Enhanced Expanded Memory Specification; AQA Enhanced EMS; LIM EMS 3.0; LIM EMS 3.2; LIM EMS 4.0; LIMulator; EMS memory; Expanded Memory Adapter; EMMQXXX0; EMMXXXQ0; EMM$$$$$; EMS memory tiling; AST RAMpage; AST Research RAMpage; RAMpage; RAMpage!; AST Research RAMpage!; AST RAMpage!; AST RAMpage Plus; AST Research RAMpage Plus; RAMpage Plus; Quadram Quadems+; Quadems+; Limulator; AQA EEMS; IBM XMA; IBM Expanded Memory Adapter; XMA (expanded memory); Emsimulator; Kam & Associates Emsimulator; V-EMM; Fort V-EMM; Fort's V-EMM; Fort's Software V-EMM; Limsim; Larson Limsim; Larson Computing Limsim; Above Disk; Above Disc; Tele-Ware West Above Disk; Tele-Ware West Above Disc; Tele-Ware Above Disk; Tele-Ware Above Disc; Teleware Above Disk; Teleware Above Disc; EMS specification; LIM EMS specification; Lotus/Intel/Microsoft Expanded Memory Specification Version 4.0; Lotus/Intel Expanded Memory Specification Version 3.0; Lotus/Intel/Microsoft Expanded Memory Specification Version 3.2; Lotus/Intel/Microsoft Expanded Memory Specification; EMS Memory Manager; EMM (memory management)

Expanded Memory Specification

<storage> (EMS) An IBM PC memory paging scheme enabling access to memory other than conventional memory in {real mode}. Expanded memory is provided through a page frame of at least 64 kilobytes in the reserved memory address region. Access to this memory is provided by an {expanded memory manager} (EMM) software. The EMM functions are accessible through interrupt 67H. In 8086 or 8088 based systems this is the only way to use memory beyond conventional memory. In systems based on 80286 or later, XMS and HMA provide alternative methods. EMS was developed jointly by Lotus, Intel, and Microsoft prior to 1988. Accordingly, this specification is sometimes referred to as LIM EMS. A complete discussion of EMS and programming examples can be found in ["PC System Programming for developers", 1989, ISBN 1-55755-035-2 (Book only) and ISBN 1-55755-036-0 (Book and diskette)]. EEMS, a competing expanded memory management standard, was developed by AST Research, Quadram and Ashton-Tate. See also upper memory block. (1996-01-10)

expanded memory

<storage> Memory used through EMS. In systems based on Intel 80386 or later processor expanded memory is part of the extended memory that is mapped into the {expanded memory page frame} by the processor. The mapping is controlled by the EMM. In earlier systems, a dedicated EMS hardware adaptor is needed to map memory into the page frame. In both cases, an appropriate device driver is needed for the proper communication between hardware and EMM. (1996-01-10)

Expanded memory

In DOS memory management, expanded memory is a system of bank switching that provided additional memory to DOS programs beyond the limit of conventional memory (640 KiB).

https://en.wikipedia.org/wiki/Expanded_memory

Википедия

Expanded memory

In DOS memory management, expanded memory is a system of bank switching that provided additional memory to DOS programs beyond the limit of conventional memory (640 KiB).

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 several versions. The first widely implemented version was EMS 3.2, which supported up to 8 MiB of expanded memory and uses parts of the address space normally dedicated to communication with peripherals (upper memory) to map portions of the expanded memory. EEMS, an expanded-memory management standard competing with LIM EMS 3.x, was developed by AST Research, Quadram and Ashton-Tate ("AQA"); it could map any area of the lower 1 MiB. EEMS ultimately was incorporated in LIM EMS 4.0, which supported up to 32 MiB of expanded memory and provided some support for DOS multitasking as well. IBM, however, created its own expanded-memory standard called XMA.

The use of expanded memory became common with games and business programs such as Lotus 1-2-3 in the late 1980s through the mid-1990s, but its use declined as users switched from DOS to protected-mode operating systems such as Linux, IBM OS/2, and Microsoft Windows.

https://en.wikipedia.org/wiki/Expanded memory