that_editor

If I remember correctly, this was also the default editor in the early SuSE distributions or early Slackware. Joe is also used by Bisqwit (https://github.com/bisqwit/that_editor).

Yes. And in his editor README he explains why he has to use Borland C++ >I wrote the editor for 16-bit DOS because I thought there would be significant troubles trying to mix 16-bit interrupt callbacks with 32-bit protected-mode code. Also I don’t think I knew back then, that DJGPP has been as modernized as it indeed has. If it even was. So I used Borland C++ 3.1. >This compiler by Borland was created before C++ was standardized, and it required me to make many sacrifices about style / sanity in the source code. For example, it did not support namespaces or templates. No STL! As such, the code is not representative of good programming practices for C++ programming, not by a long shot. https://github.com/bisqwit/that_editor

> What kind of editors is he using, anyway? He's using his own editor: https://github.com/bisqwit/that_editor

Love bisqwit's videos. For anyone curious how the mario animation is rendered in the editor: https://github.com/bisqwit/that_editor/blob/master/mario.cc