PTDOS

PTDOS or Processor Technology Disk Operating System was an operating system created during the late 1970s for computers using the Intel 8080 microprocessor and the Processor Technology Helios II Disk Memory System.

External links

Sol 20 site - This computer used PTDOS when a Helios II disk drive was installed.
http://www.trailingedge.com/cpm/SolHelios2.pdf—Leaflet for the Helios II system and PTDOS.

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