The Betamax was basically Sony’s “12.7 mm (0.5 inch) home videocassette tape recording format introduced in 1975 and derived from the earlier, professional 19.1 mm (0.75 inch) U-matic video cassette format.” Commercial after the break.

The Betamax was basically Sony’s “12.7 mm (0.5 inch) home videocassette tape recording format introduced in 1975 and derived from the earlier, professional 19.1 mm (0.75 inch) U-matic video cassette format.” Commercial after the break.