AcerNote 760iC laptop charger pinout

I have an old (Acer) AcerNote 760iC but I’m missing the charger. The connector on the laptop is a very strange connector (not a barrel jack) which is similar to a din connector. I am thinking of making my own, but I don’t know the pinout as it isn’t marked. I was wondering if anybody knows the pinout or knows a way of testing to find out. The only thing I know for sure is that the sleeve is ground.