Hi Camiel Vanderhoeven I nearly got all about PDOS and the TM990 system......however only on 8" floopy disks. I also have the complete documentation and a TM990/100M system with a DRAM and a Floppy-Controller board. best regards Walter Schubert -- MicroSys Electronics GmbH, M?hlweg 1, D-82054 Sauerlach Tel.: +49 8104 801-0, Fax: +49 8104 801-110 Sitz der Gesellschaft: Sauerlach, HRB M?nchen 48340, Ust.ID No: DE129296566 Gesch?ftsf?hrer: Dipl.-Ing. Richard Loeffl, Dipl.-Ing. Dieter Pfeiffer http://www.microsys.de