Comment by 2mlWQbCK

I have played around a lot with GW-BASIC (and pcbasic (pip install pcbasic)) lately and this strikes me as something that could be made to work very well with old BASIC variants using line-numbers, since when the interpreter sees a new line with the same number as an existing line it will overwrite the old line. Tried this in a text file:

   10 print "helo"
   20 print "world"
   10 print "hello"

Worked as expected in both GW-BASIC 1.0 and pcbasic, printing "hello\nworld". Listing the program after loading it only shows the modified line 10.

A bit awkward since the BASIC editor/REPL itself can not be used. It would work for writing BASIC using a regular text editor and then just running it with BASIC as an interpreter.