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3. Early IBM PC go-with

Alternative clues for the word msdos

• What early PCs ran on
• PC software of old
• PCs once ran on it
• Windows forerunner
• Old PC installation
• It was opened before Windows
• "Abort, Retry, Fail?" software
• What Windows 1.0 was based on
• Pre-Windows operating system: Hyph
• PC system of the past