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[[XD-DOS was ]] is an expanded disc operating system developped by the german software comany [[Dobbertin|Dobbertin]]. XD-DOS was delivered on an 16 KB [[EPROM]], with a lot of software and a manual.
It supported 0.7 MB disc formats on DS, DD disc drives. The XD-DOS also supported the 704 KB [[Vortex|Vortex]] format, which is standard for 80 track drives in germany.
Further XD-DOS 2.0 and 2.10 support the [[Dobbertin Harddisc|HD-20]] hard disc drive with 20 MB disc space, that was divided into four partitions of 5 MB. It is also possible to start [[CP/M 2.2|CP/M 2.2]] or [[The Amstrad CP/M Plus|CP/M Plus]] from the hard disc.<br>The XD-DOS ROM contains a broad variety of [[RSX|RSX]] commands.The RSX commad !HELP shows them. [[Category:Expansion ROM]][[Category:Operating System]]
