Adjusting Default Memory Configurations (Windows 9x)
Because Windows 9x is built on an MS-DOS foundation, it supports the different types of physical memory specifications that result from the design of the original IBM PC and its many descendants:
Conventional memory— Memory addresses between 0 and 640KB. MS-DOS programs normally run in this area.
Upper memory— Memory addresses between 640KB and 1MB, some of which are already in use for the system BIOS, Plug and Play BIOS, video BIOS, and video RAM. Depending on the system, between 96KB and 160KB of this space is not in use by hardware, but these addresses are not available unless additional memory managers (such as Emm386.exe) are installed during the startup process.
Extended memory— Memory ...
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