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In page List of operating systems:

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  • TRSDOS – A floppy-disk-oriented OS supplied by Tandy/Radio Shack for their TRS-80 Z80-based line of personal computers. Eventually renamed as LS-DOS or LDOS.
  • Color BASIC – A ROM-based OS created by Microsoft for the TRS-80 Color Computer.[citation needed]
  • NewDos/80 – A third-party OS for Tandy's TRS-80 personal computers.