Requirements DOS/Windows 9x/ME needs to be installed to a primary partition on the first hard drive on your PC. DOS, Windows 95a, and Windows 95b must be installed to a FAT12 or FAT16 partition. Wi…
That wiki article doesn't imply DOS + other legacy OS is possible (It's not). All WIndows prior to XP were incapable of dual-boot and relied on fixed boot-code positioning to function. Since all of them must be in the same space, they cannot co-exist.
However you can multi boot any one of them with multiple instances of Windows from XP to W10, provided that it occupies that privileged position at the front of the boot drive.
Did you add the BCD entry as described here
All operations regarding the addition of new entries to the EasyBCD menu and the BCD store can be performed from the “Add New Entry” page of EasyBCD (as selected from the “EasyBCD…