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The ultimate DOS XMS memory manager

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This is HimemX - the open-source XMS memory manager of FreeDOS. Uses unreal mode when possible and has a very low conventional memory footprint.

Got any patches? Noticed any bugs? Please report your findings on the FreeDOS mailing list: freedos-user@lists.sourceforge.net

HimemX Web Site


Hardware Drivers


Artistic License


  • high performance: uses unreal memory mode instead of protected mode switching
  • very low conventional memory footprint: ca. 2 KiB
  • open-source (Artistic license) - you are free to look into the code, and improve it as you wish
  • requires a 386-compatible CPU


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Additional Project Details

Intended Audience

End Users/Desktop

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