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[ The PC Guide | Troubleshooting and Repair Guide | The Troubleshooting Expert | Troubleshooting Specific Components | Troubleshooting the System Memory | Memory Not Recognized ]

I have over 64 MB of memory. All of my system memory is recognized under Windows, but some of it is missing when I boot DOS

Explanation: All of the system memory in the PC can be accessed and used under Windows, but only 64 MB of it can be seen when booting to DOS or using DOS programs.

Diagnosis: Standard DOS cannot access more than 64 MB of memory due to limitations with the extended memory manager it uses.


  • There are very few DOS programs that really require 64 MB of memory. You may want to see if a Windows version is available.
  • Apparently, some memory managers such as QEMM can address over 64 MB of memory, but I have not verified this myself.

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