I'm trying to create a bootable USB for MS-DOS 6.22. I can't risk using FreeDOS or any other version of DOS because I'm working with a very niche utility that has the potential to break expensive things if things are wrong.
I'm using the ISO for MS-DOS 6.22 found at AllBootDisks.
I've tested the following versions of Rufus from this link:
- V1.3.0 Beta (w/o FreeDOS)
- V1.2.0 (w/o FreeDOS)
- V220.127.116.11 (w/o FreeDOS)
- V1.1.7 (w/o FreeDOS)
...all of which produce the following error when selecting the ISO:
This version of Rufus only supports bootable ISOs based on 'bootmgr/WinPE' or 'isolinux'. This ISO image doesn't appear to use either.
From the main Rufus page, I've tested versions:
...which both produce the following error when selecting the ISO:
This image is either non-bootable, or it uses a boot or compression method not supported by Rufus.
According to this link, it's not possible at all to use Rufus to create a bootable USB for specific versions of MS-DOS.
By contrast, UNetbootin seems to accept the ISO when creating the bootable USB, but booting into it causes the boot loop described here.
Is it at all possible that the ISO from AllBootDisks is faulty? If it's not the ISO, then how else can I create a bootable flash drive for MS-DOS 6.22?