The Korg Rhythm KR55 is a 48 patterns classic drum machine from early 80’s. Non programmable but what a great snappy snare and metalic hi-hats !
The 1979’s “bi-timbric” vintage synthesizer from Korg. Preset and synth sections, joystick, LP and HP filters (with pre-programmed resonance), aftertouch, modulations are present on the Sigma, but editing possibilites (envelopes) and the 3 octaves only keyboard make it limited. Take a look at the excellent description here.
The great little monosynth/string machine from Korg