Anyway, if you just want to play Jumpman then you could always play one of the other ports for Atari or C64, or you could try the wonderful remake for the PC called Jumpman Under Construction. Wonderful because the game itself is practically untouched and you can even make your own levels ("Under Construction" - Get it?). Randy Glover himself has even given his full blessing on this one and created some new levels.

Or, you could try Jumpman Zero which is a semi-3D remake. Completely new levels but still very good.