I distinctly remember using a product called SPM (Source Program Maintenance?) when I worked in a DOS/VS Rel 34 shop between 1977 and 1979.? It was a full-screen 3270 editor, similar to SPF.
I don't think I've ever seen it mentioned here.? Does anyone have any info or fills?? I sort of doubt that it's available but it never hurts to ask.
Shawn Goodin
Shawn Goodin