A coder named [SnailMail] has taken on the challenge of writing his own text editor,
from scratch, in C, on a 386. Modern IDEs, code completion and AI integration did not gel with him, so he dug up diskettes for Borland Turbo C and Turbo C++ and did it 1980s style -- poring over books and coding by hand.
This was the first programming language the young coder learned. In order to emulate the developers of the time, hardware was also limited to period PCs (an IBM he won on an auction for $630.)
[SnailMail] describes how his solution works from about 8:00 in the
video (YT). No word on whether he copied that floppy.