| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="ts_win31-ram-limitations">
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| 4 | <title>Windows 3.x Limited to 64 MB RAM</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | Windows 3.x guests are typically limited to 64 MB RAM, even if a
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| 9 | VM is assigned much more memory. While Windows 3.1 is
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| 10 | theoretically capable of using up to 512 MB RAM, it only uses
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| 11 | memory available through the XMS interface. Versions of
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| 12 | HIMEM.SYS, the Microsoft XMS manager, shipped with MS-DOS and
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| 13 | Microsoft Windows 3.x can only use up to 64 MB on standard PCs.
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| 14 | </p>
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| 15 | <p>
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| 16 | This is a known HIMEM.SYS limitation. Windows 3.1 memory limits
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| 17 | are described in detail in Microsoft Knowledge base article KB
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| 18 | 84388.
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| 19 | </p>
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| 20 | <p>
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| 21 | It is possible for Windows 3.x guests to utilize more than 64 MB
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| 22 | RAM if a different XMS provider is used. That could be a newer
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| 23 | HIMEM.SYS version, such as that shipped with Windows 98, or a
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| 24 | more capable third-party memory manager, such as QEMM.
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| 25 | </p>
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| 26 | </body>
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| 27 |
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| 28 | </topic>
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