Less Conventional Memory After Installing MS-DOS 6.21

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If you have DoubleSpace installed and you install MS-DOS Upgrade over MS-DOS 6.0, DBLSPACE.BIN is modified to give you the equivalent of the MS-DOS 6.2 version of DBLSPACE.BIN. This DBLSPACE.BIN file includes the DoubleGuard and AutoMount features and therefore uses approximately 7 kilobytes (K) more memory. Because MS-DOS 6.21 and 6.22 Upgrade Setup cannot update the MS-DOS 6.0 DBLSPACE.SYS to the equivalent of MS-DOS 6.2 DBLSPACE.SYS, the Microsoft Real-Time Compression Interface (MRCI) libraries cannot be loaded into the high memory area (HMA). As a result, you are more likely to encounter a reduction in conventional memory with MS- DOS 6.21 and 6.22 than with MS-DOS 6.2.