Yamaha CS50

Released in 1977

The CS50 is a scaled-down version of its monstrous sibling, the CS80. The CS50 only has 4-voice polyphony, with one VCO and one switchable (LP/HP) 2-pole filter. It has a 49-note keyboard which responds to aftertouch, and has 13 presets, with no storage for user-created programs.