Related Clues:

• They're not final releases
• Software development phase
• Test software version
• Obsolete VCR format
• Alpha follower
• It's not the final release
• Word with blocker or carotene
• Software prototype
• Erstwhile VHS alternative
• Test version
• Type of blocker
• Some test versions
• Alpha chaser
• Old VCRs
• Failed VCRs