The MS-DOS (or PC-DOS) operating system only allows 640K of RAM memory to be used by the operating system and application programs. To get around this barrier, Lotus, Intel and Microsoft agreed upon a standard method of expanding memory beyond the DOS limit. This standard, known as expanded," LIM, or EMS memory, allows applications to allocate memory beyond the DOS limit by breaking this memory use. Expanded memory on an 8088 computer is added in the form of a separate memory card. 80286 and 80386 computers have the added capability of allowing their "extended" memory emulate expanded memory by using special device drivers or memory managers. (7/96)
PC memory conforming to the LIM EMS 4.0 spec. Gives access to more than 640K of memory on Intel processors before the 80386. Used in a number of Windows-based products. EMM386.EXE is an expanded memory emulator for 80386 and newer machines. Obsolete.
Memory that can be used by some DOS software to access more than the normal 640K (technically, more than 1Mb). 80386, 80386SX, and 80486 computers can create expanded memory readily by using an EMS (expanded memory specification) driver provided with DOS, through Microsoft Windows, or through a memory manager such as Quarterdeck QEMM or Qualitas 386 To The Max. To use expanded memory, a program must be EMS-aware or run under an environment such as Microsoft Windows. 8088- and 80286-based computers often need special hardware to run expanded memory. See also memory
A DOS mechanism by which applications can access more than the 640KB of memory normally available to them. The Expanded Memory Specification LIM 4.0 is the standard method of accessing expanded memory, and lets programs running on any of the Intel 8086 family of processors access as much as 32MB of expanded memory. The expanded memory manager creates a block of addresses into which data (held in memory above the 1 MB limit) is swapped in and out as needed by the program. In other words,a 64K segment of addressable memory creates a small window through which segments of expanded memory can be seen, but only one segment at a time.
(EMS) - Memory outside the one (1) megabyte (MB) limit of DOS that is accessed in revolving blocks.
Memory beyond the standard 640KB of the computer's memory, which is used according to a standard developed jointly by Lotus, Intel and Microsoft (LIM) and know as the Expanded Memory Specification (EMS). This standard is abbreviated LIM-EMS.
Memory in addition to conventional memory that some applications use. Expanded memory is an older standard being replaced by the use of extended memory.
A type of virtual memory accessible with Windows 2.x and 3.0 in real mode, whereby memory banks are swapped in and out of the 640K address space. Expanded memory isnâ€(tm)t used in Enhanced or Standard Mode, or in future Windows versions, so it isnâ€(tm)t applicable to SmartHeap.
Memory configured for the Lotus/Intel/Microsoft (LIM) 4.0 expanded memory specification (EMS). Physical expanded memory comes in the form of a card installed on the computer. On 80386- based (and higher) computers, extended memory can emulate expanded memory. See also conventional memory, extended memory, extended memory blocks, high memory area (HMA), upper memory blocks (UMBs).
Extra memory (above 640k) on your XT or AT-compatible computer, which is installed with an EMS driver, and may be used by some programs to store data.
Expanded memory is often known as LIM memory. The LIM EMS standard was jointly devised by Lotus*, Intel* and Microsoft*. EMS is the Expanded Memory Specification. It describes ways in which a program may access up to 32 MB of memory outside conventional memory. Programs that use expanded memory include spreadsheets, databases, and other programs that need access to large amounts of data. See Chapter 10, ``Managing Memory'' for more details.
Personal computer memory that is addressed by DOS, from 640KB to 1MB, to increase conventional memory. Contrast with conventional memory and extended memory.
Depending on the type of pager, expanded memory lets you to store up to 30 messages in your pager. This is a great feature to have for storing phone numbers you might need in the future. Some pagers store messages even when the battery is removed.
Increased memory available after adding an EMS (Expanded Memory Specification) board to an 8086 or 80286 machine. Expanded memory can be simulated in software. The EMS board can increase memory from 1 megabyte to 8 megabytes by swapping segments of high-end memory into lower memory. Applications must be written to the EMS standard in order to make use of expanded memory. See “extended memory.
Also known as EMS (Expanded Memory Specification), expanded memory is a technique for utilizing more than 1MB (megabyte) of main memory in DOS -based computers. The limit of 1MB is built into the DOS operating system. The upper 384K is reserved for special purposes, leaving just 640K of conventional memory for programs.
Memory used by DOS computer. Expanded memory is not memory "above" the 1MB mark on a PC. It is more like "beside" the basic 1MB of memory.
Memory above 1MB that requires an expanded memory board and expanded memory manager.
Additional memory that a computer uses by swapping data into and out of a reserved portion of a computer's standard memory area. With expanded memory, additional memory is added to the computer in the form of memory chips or a memory board. To access this additional memory, an expanded memory manager reserves 64 of the standard 640K as a swap area. The 64K represent 4 pages, each page consisting of 16K. Pages of data are swapped into and out of this 64K region from expanded memory at a high speed. Old DOS programs commonly used expanded memory, but Windows and its programs prefer extended memory. See also extended memory.
A technique for accessing RAM above 1 MB. To enable expanded memory on your system, you must use an EMM. You should configure your system to support expanded memory only if you run application programs that can use (or require) expanded memory.
Memory in addition to conventional memory, which is available through an expansion board for applications. Expanded memory requires a special program called an expanded memory manager that comes with the expanded memory board or the operating system.
Refers to usable RAM in excess of 1 MB. Not all applications can run or take advantage of this expanded memory.
Memory allocated by an EMS emulator
Memory beyond the 640K limit of usable RAM in DOS which conforms to the Lotus-Intel-Microsoft (LIM) specifications for expanded memory. This memory is available only to DOS applications that can support it. It is an older standard which is being replaced by extended memory.
memory addressed above 1MB that is accessed via the Lotus-Intel-Microsoft Expanded Memory Specification (LIM or EMS). To be utilized by programs , Expanded Memory requires a special memory manager.
Memory in addition to conventional memory that is available for applications. It is allocated in 16K blocks.
Type of memory that can be added to IBM personal computers. The use of expanded memory is defined by the Expanded Memory Specification (EMS), which supports memory boards containing RAM that can be enabled or disabled by software. See also: extended memory
n. A type of memory, up to 8 MB, that can be added to IBM PCs. Its use is defined by the Expanded Memory Specification (EMS). Expanded memory is not accessible to programs in MS-DOS, so the Expanded Memory Manager (EMM) maps pages (blocks) of bytes from expanded memory into page frames in accessible memory areas. See also EEMS, EMS, Expanded Memory Manager, page frame.
Expanded Memory was a trick invented around 1984 that provided more memory to byte-hungry, business-oriented MS-DOS programs. These were typically spreadsheets and databases running on the original IBM PC, and on its successors like the IBM XT and IBM AT. IBM PC and IBM XT had real mode memory architecture, which only allowed programs to use 1 megabyte of address space, of which only up to 640 Ki B was available for normal ram (the remainder from 640 KB to 1 megabyte being reserved for peripherals, most notably the screen memory in the display adapter).
