Related Clues:

• Two, in Mexico
• MS ____
• Windows ancestor
• One less than ''tres''
• 27-Across, e.g.
• Un cuarto of 62-Across
• Recommended actions
• Many PCs once ran on it
• MS _____
• Early PC interface
• Double 10-Down
• Accepted behavior
• The cube root of ocho
• Buns and bobs
• Early computer acronym