Related Clues:

• Prerelease version
• As yet unmarketed, as software
• ___-test
• Type of test
• Alpha's follow-up
• Former VHS rival
• With 61-Down, Pollux, e.g.
• Test
• Nuclear physics prefix
• Gamma preceder
• Not-quite-final software
• Alpha-gamma connection
• Second letter
• Bygone VHS alternative
• Test version of software