== Technical ==
Uses [[XD-DOS]] v2.10 (which supports the harddisc, and additionally supports external double sided 80track 80 track disc drives). The 20 MB harddisc is split into four partitions, with drive names D, E, F, and G (drive name C isn't used here, but may be used as RAM disc, in combination with Dobbertin RAM expansion). Under [[FutureOS]] the four partitions are named I, J, K and L. The hard disc is controlled by this I/O Ports:
#FBE0 Dobbertin Harddisc Data Port
#FBE1 Dobbertin Harddisc Status, Reset