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What is ram memory
How do you install ram memory
Difference between types of ram memory
How does virtual memory address work
How the computer stores ram memory
What does Conventional memory mean
How does Cache memory effect the system
What is DDR ram memory modules
What is EDO ram memory modules
What is Rambus ram memory modules
What is Sdram ram memory modules
What is read only memory (ROM)
What does Extended memory mean
What does Upper Memory Area mean
Why didn't Bubble memory get popular
What are they using DDR3 memory for
What they used drum memory for
What is Flash memory and its uses
What is the uses of Registered memory
How does video ram help a computer
What is a simm memory module
How does memory refresh work
What will happen with XDR DRAM
What is sgram used for
Proper ways to use a ram drive or ram disk
What can static ram do
Why do servers use parity (EEC) ram
How did Dram come about
What are the uses for eeprom
What does Extended memory mean

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Extended memory refers to memory above the first megabyte of address space in an IBM PC with an 80286 or later processor.

Extended memory is only available on PCs based on the Intel 80286 or higher processor, as only these chips can access more than 1MB of RAM. On a 286 or better PC equipped with more than 640KB of RAM, generally, the additional memory would be re-mapped above the 1MB boundary, making it available to programs running in Protected mode. Even without such remapping, machines with more than 1MB of RAM would have memory appearing above 1MB.

Extended memory is not directly available in real mode, only through EMS, UMB, XMS, or HMA; only applications executing in protected mode can use extended memory directly. In this case, the extended memory is provided by a supervising protected-mode operating system such as Microsoft Windows. The processor makes this memory available through a global descriptor table and one or more local descriptor tables. The memory is "protected" in the sense that memory assigned a local descriptor cannot be accessed by another program without causing a hardware trap. This prevents programs running in protected mode from interfering with each other's memory.

A protected-mode operating system such as Windows can also run real-mode programs and provide expanded memory to them. The DOS Protected Mode Interface is Microsoft's prescribed method for an MS-DOS program to access extended memory under a multitasking environment.

"Here are the various used ram memory we have in stock."
16mb EDO used Ram Memory 32mb EDO used Ram Memory 64mb EDO used Ram Memory
32mb Sdram used Ram Memory 64mb Sdram used Ram Memory 128mb Sdram used Ram Memory
256mb Sdram used Ram Memory 512mb Sdram used Ram Memory 1gig Sdram used Ram Memory
128mb DDR used Ram Memory 256mb DDR used Ram Memory 512mb DDR used Ram Memory
128mb Laptop used Ram Memory 256mb Laptop used Ram Memory 512mb Laptop used Ram Memory