Super Prologue 21
From Sega Retro
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The Super Prologue 21 (プロローグ21) is a "multimedia karaoke system" released by Sega in Japan during the 1990s as a successor to the Prologue 21.
The Super Prologue 21 is built very similarly to the Prologue 21, but has slightly different components - the Amplifier (), Commander (SKC-1000) and Wireless Microphone Receiver (SKN-5246) return with new features, though the Changer appears to be identical to the original Prologue 21.