The Now Approaching screens are a separate part of the program and do not contain the same coding. Backspace+F2 is only going to work in those parts of the program - I.E. the game levels - in which it is programmed in. If you want an image of the Now Approaching screen, you'll have to view JJ1 in a window, which by the way doesn't work in parts of the program where Backspace+F2 does, so they're mutually exclusive functions.
Dosbox is a program needed for those people who have operating systems that don't support DOS without help. If you don't know what it is you don't need it.
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