Windows 3.11 (Retail...
This is a 4-disk set for installation of the MS-DOS 6.22 onto a hard disk. Disk #1 is bootable.
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Microsoft DOS 6.22 was the last standalone version from Microsoft. It was also the last from Microsoft to run on an 8088, 8086, or 286.
6.22 adds DriveSpace, a replacement for DOS 6.20's DoubleSpace drive compression that was removed in 6.21.