Related Clues:

• CPU adjunct
• 1980's PC's ran on it
• CD tag
• CD- -- drive
• 'Bad command or file name' interface
• Permanent data storer
• Kind of PC command
• CD-__
• What we opened before we had Windows
• CD- ---
• Early PC software
• CD- --
• Platform introduced in 1981
• Some computer memory
• Old PC platform