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Last modified on 9 May 2018, at 14:54

X-DDOS

Revision as of 14:54, 9 May 2018 by Arnoldemu (Talk | contribs)

X-DDOS is a floppy disc and hard disc operating system from the german company Dobbertin Industrie-Elektronik. It was first released in 1988. It provides 0.7 MB floppy disc formats for B drives and allows to access the Dobbertin Harddisc HD20. X-DDOS is delivered as a 16 KB EPROM with a lot of software and a manual.

X-DDOS has the ROM name 'XDDOS ROM' but shows a sign-on message of "X-DDOS 2.10 (C)1990 Dobbertin GmbH"

  • X-DDOS can be used as a rom 7 replacement.
  • X-DDOS can autoboot CPM if it's drive 0.
  • X-DDOS has a checksum check

RSX commands

(same operation as AMSDOS): |A, |B, |CPM, |DISC, |DISC.IN, |DISC.OUT, |TAPE, |TAPE.IN, |TAPE.OUT, |DRIVE, |USER, |ERA, |REN

(same operation as VDOS): |CAS, |CAS.IN, |CAS.OUT, |ATTRIBUT, |FORMAT, |SLOW, |FAST, |ROMOFF, |AMSDOS, |X

X-DDOS extras: |SYSCOPY, |TYPE, |GDUMP, |DIR128, |DIR64, |HELP, |XDRIVE

|HELP,<number> - display list of RSX commands for the given rom <number>

|X,|XDRIVE - swap logical A and B. Normally logical drive A accesses unit 0 and logical drive B accesses unit 1. Therefore using |X:|A will access unit 1 as logical drive A and unit 0 as logical drive B.

|CPM or |CPM,<drive> - Boot CPM from drive A, or chosen drive. A=0,B=1,D=3,E=4,F=5,G=6. Can boot from D,E,F,G if HD is detected. Can't boot from drive C.

Floppy Discs

X-DDOS supports B drives on all CPCs with 80 tracks and 2 sides. It's compatible to the 704 KB Vortex format of the Vortex drives. Additionally it provides the Dobbertin Data- and System format (about 0.7 MB).

X-DDOS supports CP/M and CP/M Plus on 0.7 MB B-drives.

Hard Disc HD 20

  • XD-DOS 2.0 and 2.10 support the HD-20 hard disc drive.
  • XD-DOS auto detects if the HD20 is connected. A message "* Harddisc not active *" is displayed if it is not. This is shown below the ROM sign on message.
  • XD-DOS maps the HD20 to four partitions with 5120 KB each. Each partition is accessed by using the logical drive letters D, E, F and G.
  • The integration of X-DDOS with the firmware allows to load some games and demos from hard disc.
  • CP/M and CP/M Plus can be booted from hard disc.

Downloads