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.
Note that although I only tested this process using MS-DOS 6.22, the process outlined below should be identical for any version of MS-DOS so long as you download and use the boot disk. 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. Download ms dos 6.22 bootable cd iso files found Uploaded on TraDownload and all major free file sharing websites like 4shared.com, uploaded.to, mediafire.com and many others. After clicking desired file title click download now button or copy download link to browser and wait certain amount of time (usually up to 30 seconds) for download to begin. AllBootDisks ISO Image Downloads These are the ISO boot disk images available from AllBootDisks. Download the ISO image you need, and if you need assistance creating a bootable CD from this image, visit the how-to page.
I'm using the ISO for MS-DOS 6.22 found at AllBootDisks.
So far I've tried this ISO in several versions of Rufus and the latest version of UNetbootin.
I've tested the following versions of Rufus from this link:
..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.
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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?
Around the time when Windows 98 was mainstream, bootable MS-DOS CDs and USB drives used a 1.44MB floppy disk image as the actual boot target. The CD/USB drive stores the floppy image either visibly on the file system or invisibly outside of a partition, and the computer would boot to a virtual A:
drive. If access to the CD/USB drive is desired after boot, the appropriate driver must be present on the floppy image and loaded.
At least in some cases, booting from the floppy image requires features implemented in BIOS. (I remember trying to make a rescue disk on a state-of-the-art 32MB USB drive, and there being different instructions for BIOS that support USB-FDD, USB-ZIP, USB-HDD, etc.)
If you don't feel like hunting down period-appropriate documentation and tools, your best bet is probably a MS-DOS floppy image paired with a modern bootloader that supports memdisk features. syslinux
/isolinux
and GRUB4DOS
comes to mind.
Rufus author here.
As explained here, Rufus does not embed any version of MS-DOS with the application, so it doesn't matter what version of Rufus you use, you won't magically get a specific version but the Windows Millennium DOS version that Windows provides (that is, up to Windows 8.1, since Windows 10 removed it altogether, so there's no MS-DOS creation option in Rufus if running on Windows 10 or later).
Now, your expectation is that Rufus can create an MS-DOS bootable USB if you provide your own version (as an ISO, or something else). This is not the case. Rufus cannot be used to create an MS-DOS bootable USB drive except a Windows Millennium one, if you are running Windows 8.1 or earlier, and, because the demand for such a feature is exceedingly small (at this stage, I have to point out that the amount of people who have been able to claim that they have found a genuine flaw in FreeDOS that forces them to use MS-DOS currently stands at exactly zero, as most of the 'issues' that people have with FreeDOS only have to do with a slightly different way to handle AUTOEXEC.BAT
/CONFIG.SYS
or menus, which is easily addressed and does not constitute a DOS incompatibility), I have no plans whatsoever to ever add that functionality as I have 100% confidence that FreeDOS can always be used in lieu of MS-DOS.
The only way I would ever consider adding this feature is if the following conditions are met:
Short of these two conditions being met, I will respectfully request that you either use FreeDOS (which, again, I have yet to see fail compared to MS-DOS in terms of compatibility) or another utility than Rufus.
Ok I got it working with an old IBM Thinkpad.Here are the steps I took:
That's it! Let me know if it works for you.
Note: I think the problem with just doing the File->Drive thing is that it doesn't put the files in the right place on the USB stick. When you let it prep and copy the files itself, it puts everything in the proper place and order.
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** You may have to monkey with the checkboxes in this section. My laptop places the USB Boot under its 'Hard Drive' section when it lists it in its BIOS. Your computer may consider it removable storage, or a FDD.
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