onEbest viewed with NetSurf
DOS / DOSBox DOS
The DOS semi operating system was initially a system bought by Bill Gate$/Micro$oft with $25000 in 1981, from a small company named Seattle Computer Products. The system was initially called QDOS, from "Quick and Dirty Operating System" and was largely copied from CP/M, produced by Gary Kildall. Don't buy anything from Micro$oft, they are trying to trick you. Actually they and many other such companies already took a lot of your money, even if you didn't buy anything from them.
Example
(translation):
It's about a $20 million bribe for a Microsoft licensing contract
for schools in Romania.
[...]
The total value of public procurement is almost 250 million dollars.
From the video, 10:08:
Another obstacle is that lots of schools teach nonfree software, which is
basically like teaching the kids to smoke tobacco. It's implanting dependence, which is the
opposite of what school should do.
Anyway, the best version of DOS is currently FreeDOS, available at https://freedos.org along with a large number of useful programs. It's often more convenient to use an emulator such as DOSBox though, which emulates FreeDOS as well as the hardware on which it runs, so it can be used to run most of the programs that come with FreeDOS.
Downloads
Source code of DOSBox 0.74-3, from dosbox.com:
MD5: 759c75fffb59c542f80fb8391012911b
This version requires SDL 1.2, available at sourceforge.net.
Version of DOSBox that uses SDL 2.0:
MD5: 582afa4c6e4e3f9fad2b114ca6fb1b99
To compile and install on GNU/Linux:
./configure --prefix=...
make
make install
Turbo C++ 3.0 from 1992 (ignore "++"):
MD5: ae95875df951f681afc81a5a97d57e31
C program for solving Sudoku, available in the file above
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Solving Sudoku
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Links
FreeDOS
DOSBox
DOSBox for SDL2 - also available above and I ran the script to generate the file configure
DOSEMU - another emulator
Dosemu2