I've had a number of interesting responses in this thread, some of
which may prove useful in other contexts. But nothing so far that
beats the tool I've already found, as basic as it is.
Well, you gave some very sharp limitations... it has to be free. It has to work on a 5250 interface. That pretty much narrows it down to either EDTF or something like WRKDBF, but EDTF is certainly the better tool for source code!
You could potentially use something like vi running under PASE, but it'd be horrible in a 5250 interface. (If you could get a normal telnet session instead of a 5250 one, however, it'd be a vast improvement IMHO, though many would disagree with me.)
I run vi on my System i. It runs in PASE, and I access it via the SSH server (part of 5733-SC1, option 1). It's free. It's plain-text, doesn't require any GUI. But doesn't really work in the 5250 interface. Plus, vi is something of an acquired taste... It's vastly more powerful than EDTF or Notepad, but takes a lot of getting used to.
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