Edit for C128

[BigDumbDinosaur]

What I would find especially cool (and often miss with editors also on newer machines) is an option only to load chunks of the file, so that you have a "window" of it in RAM ... handy for really large files (e.g. eBooks in plain text - idea: How about supporting Rich Text?). Would make sense to realize that with direct disk access, i.e. on sector level ... maybe the border to a disk editor is fuzzy

Floppy disk access is too slow to make a paged editor practical.  It was practical with the Lt. Kernal, though, and I had (long ago) a 64 mode editor that could handle files many times the size of available RAM.  It worked well because the Lt. Kernal could load a sector into RAM in about 10-12 milliseconds, depending on disk latency.