This article was previously published under Q81476
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Microsoft Windows versions 3.1 and 3.11 will run in standard mode whenEMM386.EXE is providing upper memory blocks (UMBs). Microsoft Windowsversion 3.0 will not run in standard mode if EMM386.EXE is providing UMBs.
Changes were made in Windows 3.1 to allow Windows to run in standard modewith EMM386. There were no changes made EMM386 to support this.
Standard mode Windows 3.1 is VCPI-compliant; standard mode Windows 3.0 isnot. VCPI is an industry protocol to allow 386-based memory managers likeEMM386 to cooperate with 286-protected mode DOS extenders. For example,Lotus 1-2-3 3.x and standard mode Windows have built-in DOS extenders. Asthe first 386-based memory managers were LIMulators, VCPI is actually anextension to the Lotus-Intel-Microsoft Expanded Memory Specification (LIMEMS).
Microsoft is aware that some third-party companies have released specialversions of 80386 memory managers that allow a specific release of Windowsto run in standard mode. Microsoft, however, chose not to change the memorymanager; rather, we changed Windows to work with any 80386 memory managerthat is VCPI compliant.
Examples of VCPI compliant 386 memory managers include EMM386, QEMM,386MAX, BLUEMAX, and CEMM. Check your product's documentation for details.Note that if the product provides both XMS and EMS memory, the driver mustsupport XMS 3.0, not 2.0.
The products included here, QEMM, 386MAX, BLUEMAX, and CEMM, aremanufactured by vendors independent of Microsoft; we make no warranty,implied or otherwise, regarding these products' performance or reliability.