Option menu (Text Window)
Margin
The setting for the initial margin.
It must be not smaller than 24.
The largest number that can be set depends on the point number of fonts and the specification of OS.
The following program tests whether the setting is good or not. If the output spans two or more lines, the margin is too large.

    10 ASK MARGIN a
    20 PRINT REPEAT$("W",a)
    30 END

If an input is except an numeric, the setting shall not be changed.

Erase Before Running
If this item is set, the current text shall not be erased.