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X-DDOS is a disc and hard disc operating system from the german company Dobbertin Industrie Electronic. It provides 0.7 MB floppy disc formats for B drives and allows to access the [[Dobbertin hard disc Harddisc]] HD20. X-DDOS is delivered as a 16 KB EPROM.
== Floppy Discs ==
== Hard Disc HD 20 ==
The [[Dobbertin hard disc Harddisc]] HD20 consists of four partitions with 5120 KB each. X-DDOS allows the access to this 5 MB partitions by using the drive letters D, E, F and G. The integration of X-DDOS allows to load some games and demos from hard disc. Also CP/M and CP/M Plus can be booted from hard disc.
