MS-DOS (FAT32) USB to MS-DOS
For all practical purposes MS-DOS is MS-DOS (FAT32) nowadays, see https://www.howtogeek.com/235596/whats-the-difference-between-fat32-exfat-and-ntfs/ for instance:

FAT32 is the oldest of the three file systems available to Windows. It was introduced all the way back in Windows 95 to replace the older FAT16 file system used in MS-DOS and Windows 3.
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Limitations come with that age, however. Individual files on a FAT32 drive can’t be over 4 GB in size—that’s the maximum. A FAT32 partition must also be less than 8 TB, which admittedly is less of a limitation unless you’re using super-high-capacity drives.