AFAIK Georg Potthast wrote a port that worked in DOS based on the work that Benjamin Johnson for Windows. I believe it was based on 3.0p4:

https://www.bttr-software.de/forum/board_entry.php?id=10797

Unfortunately, none of those ports made their way back to the main project. However, if there is enough interest I would be willing to merge them. I'm not very familiar with DOS/FreeDOS, so probably someone would have to help us to update the changes, but probably doable between 3.0 and 3.2.0.