Extended Memory is memory above and beyond the standard 1MB (megabyte) of main memory that DOS supports. The 8088 and 8086 PCs can not have Extended Memory because these chips can only access memory less than one megabyte in size. Therefore, Extended Memory is only available in PCs with an 80286, 80386, 80486, Pentium or later microprocessor. Two types of memory can be added to a PC to increase memory beyond 1MB: expanded memory and extended memory. Expanded Memory conforms to a published standard called EMS that enables DOS programs to take advantage of it. Extended Memory, on the other hand, is not configured in any special manner and is therefore unavailable to most DOS programs. However, Microsoft Windows and OS/2 can use extended memory.
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