Related Clues:

• Type of test
• Alpha's follow-up
• Former VHS rival
• With 61-Down, Pollux, e.g.
• Nuclear physics prefix
• Gamma preceder
• Not-quite-final software
• Alpha-gamma connection
• Second letter
• Bygone VHS alternative
• Test version of software
• Aristotle's B
• Software test
• ___ blocker
• Old videotape format