Ms Dos 7.1 Code Privilege Levels

It does this out of the box as an option without needing to specify an image or ISO.

I mainly needed to be sure that it wasnt already DOS 6.22 and that I wasnt therefore wasting my time finding out how to create a bootable USB from 6.22.

Ive had a look at the Wikipedia page on real mode, but Im still a little unclear.

In practical terms, what does real mode do, and does this patch restore all of its functionality.

Ms Dos 7.1 Code Privilege Levels

Real mode provides no support for memory protection, multitasking, or code privilege levels.

The 80286 lifted that restriction by expanding to a 24-bit address bus and adding protected mode, allowing the CPU to address 16 MiB of memory (which was a huge amount of RAM in 1982, more than most PCs had fixed storage ).

Protected mode 286 code wasnt all that common in practice (Im looking at you, OS2 and Xenix), and while the 80386 introduced 32-bit protected mode in 1985, it took another decade before protected mode 32-bit software became reasonably common on PCs.

Plus, as opposed to using MS-DOS, which is closed source and which Microsoft has stopped supporting a long time ago, FreeDOS is Open Source and actively supported, so youre usually much better off using FreeDOS.

Would you mind shedding some light over here: superuser.comquestions1228065.

I cant seem to get Rufus to install MS-DOS 6.22 from an ISO, and from what youre saying, this doesnt seem to be a legal issue.

I need DOS 6.22 because I cant risk using an alternative given that the utility Ill be running is incredibly niche and has the potential to break expensive things if not 100 right, so Id really appreciate your help over there.

That said, all I had to do was go out and find a boot disk image online.

Thats the big difference between 7.10 and 7.00.

Note, also, that theres no such thing as DOS 7.1.

MSs version numbers are always X.YY.

The copies of DOS 7.1 circulating out on the web are something that some individual put together, taking a copy of the DOS version supplied with 95OSR29898SE and hacking the COMMAND.COM with a text editor to make it report version 7.1.

And, of course, just for completeness, DOS 8.00 is the one shipped with WinME that removed real-mode support so DOS boots into protected mode, with HIMEM integrated.

Other trivia: you need MS-DOS 4.00 (officially, 3.3 unofficially with certain limitations) to support FAT16 (previously, only FAT12 was supported).

I created a bootable USB running MS-DOS using Rufus and then booted into it on my laptop.

Once in MS-DOS, I ran the ver command to determine its version, which returned Windows Millennium, aka Windows ME.

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Ms Dos 7.1 Iso