Crossword puzzle clue "operating system before windows"

Here are the possible solutions for operating system before windows clue

Answer
Clue
Relevancy
dos
Clue
Operating system before Windows
Definition
DO, a party, celebration
msdos
Clue
Pre-Windows operating system: Hyph.
nokia
Clue
Smartphone brand that runs the Windows Phone operating system
pcs
Clue
Machines that run the Windows operating system: Abbr.
unix
Clue
Operating system that doesn't do Windows?
vista
Clue
Windows operating system released in 2007
Operating system that succeeded Windows XP
gooff
Clue
Begin operating or stop operating

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