[[Dobbertin |Dobbertin Industrie-Elektronik]] implemented their own CPM+.
The sign on message displays "CP/M Plus Amstrad Consumer Electronics plc".
* a RAM-Disk
This uses a Dk'tronics/Dobbertin RAM expansion. It doesn't support Vortex RAM expansion. The size of the RAM expansion is auto-detected allowing ram disk sizes of 62KB, 190KB, 254KB, or 444KB. These correspond to 256KB RAM, 256KB Silicon Disk and combined RAM and Silicon Disk (512KB RAM) expansions or to partially / fully populated Dobbertin expansions. The Ramdisk is accessible in CPM+ with drive C:. In early versions is was M:.
* support Support for their the Dobbertin HD20 Hard disk
This requires a HD20 capable X-DDOS because it checks for a specific variable set by X-DDOS if it detects the hard-disk. The main hard disc functions are in bank 0, with common hard disk buffer read/write in the common C7 bank at &FE00. The hard disc is accessible in CPM+ with drive D,E,F and G.
If 60hz is detected the Vertical Sync is set to 16 lines and the hsync is set to 4. Otherwise it remains unchanged.
[[Category:Operating System]][[Category:CP/M]]