1984 D-50
The D-50 is Sony's first portable CD player, released in 1984.
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The D-700 is a compact, AC-powered CD player designed for stationary use. It features a front-loading mechanism and includes functions such as automatic track selection, shuffle playback, repeat playback, and a digital display. The line output has an independent volume control. It does not support battery operation and is designed for fixed installation. While it shares a CD playback circuitry with portable units, its operation is closer to that of a stationary unit. It is a model that exemplifies the configuration of early compact, stationary CD players.