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Himem.sys

himem.sysThe himem.sys is a driver file first included with MS-DOS 5.0 and included with Windows up to Windows 98 that manages extended memory. Versions of Microsoft Windows after Windows 98 only utilized the memory manager included with Windows. To load the himem.sys, add the below lines into your config.sys.

DEVICE=C:\Windows\HIMEM.SYS
DOS=HIGH,UMB
DEVICE=C:\Windows\EMM386.EXE NOEMS

Also see: EMM386.EXE, Extended memory, Memory terms