I think the default blitz font is the one listed as "Blitz", which is installed along with blitzbasic. To switch back to the default font, just load "Blitz", like:
But I don't recommend using the "Blitz" font, as you would have to distribute it along with your exe and I'm not sure what legal issues there is to that (distributing part of a commercial product). You'd be better off to just use a standard font such as "Courier New", as big10p suggested.
defaultfont = LoadFont("Blitz", 12) ... SetFont defaultfont
But I don't recommend using the "Blitz" font, as you would have to distribute it along with your exe and I'm not sure what legal issues there is to that (distributing part of a commercial product). You'd be better off to just use a standard font such as "Courier New", as big10p suggested.