| slovo | definícia |
expanded memory
(foldoc) | expanded memory
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
adapter 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)
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| | podobné slovo | definícia |
expanded memory manager
(foldoc) | expanded memory manager
(EMM) IBM PC memory manager software
implementing Expanded Memory Specification, such as EMM386
or QEMM386. EMMs can usually provide UMB as well.
(1996-01-10)
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expanded memory page frame
(foldoc) | expanded memory page frame
The part of the IBM PC reserved memory address
space used by EMS.
(1996-01-10)
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expanded memory specification
(foldoc) | Expanded Memory Specification
EMS
LIM EMS
(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)
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