well, to start, you should probably check out some other attempts at it.
Gospely's take on it is probably the definitive one:
then there's the one by this guy:
if i remember the song correctly, there's three main components: - the main melody (pretty simple, always repeats) - the chord riff (a little harder because you'll probably need to use multiple oscillators to form the chords) - the calculator sounds (that's probably the hardest)
i'd say it's a good exercise to figure out how to get your DS-10 to produce sounds that are like the original. but i'll leave that to you to discover that on your own. =)