A character window-based editor is available for editing a numbered line of code in the BBj TermConsole. For a description of the character window editor, BBj SysConsole/SysWindow - Editing a Line of Code.
Note: The BBj TermConsole is only equipped to edit code with traditional line numbers, although it can load, list, and execute unnumbered code. Trying to edit a line of code without a line number in the character window editor will have undocumented effects. It is recommended that development and editing of unnumbered code be performed in the BASIS IDE on a graphics-enabled computer, or other suitable text editor.