Expanded (Paged) Memory; Figure A-1 Extended And Expanded Memory Configuration - Kingston Technology KTM609 Installation Manual

Appendix A Extended vs. Expanded Memory 29

Expanded (Paged) Memory

The development of the Expanded Memory System (EMS) was a software solution to
the memory limitations of DOS. EMS uses a 64KB area of reserved high memory (the
area between 640KB and 1MB that DOS is able to get to), and copies four 16KB
"pages" of data back and forth as needed from the higher areas of memory that DOS
cannot get to. The EMS acts as a messenger to locate and retrieve the segments of
memory DOS requests and place them within its reach.
EMS software allows you to allocate up to 32MB of memory as Expanded memory
since it is not restricted by the 1MB limit of DOS or the 16MB limit of the processor.
Insert previous illustration here

Figure A-1 Extended and Expanded Memory Configuration

KTM-609/16 Installation Guide - Rev. D1 Kingston Technology Corporation