Their very first product in 1963 was also one of the worlds first ever drum machines:
It had the rather long winded name the "Keio Gijyutu Kenkyujo DA20 DoncaMatic Disk Rotary Electric Auto Rhythm Machine". I'll call it the DA20.
Earlier drum machines used loops of tape (like in a Mellotron) to produce the drum sounds.
The DA20 instead utilized individual electronic voice circuits & used a rotating disc to make the contacts needed to produce the drum sounds. The DA20 also boasted built in amplifers & speakers..
1963
+DA20 DoncaMatic rhythm machine.
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This is on display on the ground floor of Korg's Tokyo office.
The glass front is of course a later addition to show the inside.
I can see lots of valves. :-)
1966
+DC11 DoncaMatic rhythm machine.
+DE11 DoncaMatic rhythm machine.
+DE20 DoncaMatic rhythm machine.
+MP5 & MP7 Mini Pops rhythm machines.
Here is a link to a video of KORG's second ever DE20
I will probably never see or her one of these in the flesh so here is the next best thing
1967
+MP2 Mini Pops rhythm machine.
+MP3 rhythm machine.(UniVox SR-55)
MiniPops 3 (1967)
The Korg MiniPops 3 was also sold under the name Univox SR-55.
1971
+MP20S rhythm machine.
1972
+MP Junior rhythm machine.
Korg MiniPops Junior (1972)
1976+Mini Pops MP120 rhythm machine.
+Mini Pops MP35 rhythm machine.
MP35 (1976)
+SR120 rhythm machine.
1979
+KR33 rhythm machine.
Korg KR-33 Rhythm Machine (1979)
+KR55 rhythm machine.
1982
+KR55B rhythm machine.
1983
+KPR77 programmable rhythm machine.
('Korg Programmable Rhythmer')
KPR77 (1983)
1984+Korg "Super Section" PSS-50
1985
+DDM110 rhythm machine.
+DDM220 rhythm machine.
1986
+Korg DDD-1: Sampling drum machine
1994
+Korg WAVEDRUM: DSP percussion instrument based on State Variable technology and multiple synthesis algorithms
1999
+Korg Electribe:
2006
+Korg PadKontrol drum-trigger style MIDI controller
2008
+Korg DS-10 - Music program for the Nintendo DS.
This is probably Korg's first attempt to make the MS10 accessible to the masses. It included a drum machine.
Korg/Nintendo DS10 (2008)
+Korg iElectribe - A touch screen version of the KORG Electribe made for Apple's iPad.
The iELECTRIBE Gorillaz Edition (2010)
2011
+Korg Wavedrum Oriental - A middle-eastern, Arabian styled version of the Wavedrum.
+Korg Monotribe
+Korg Wavedrum Mini
Korg MonoTribe (2011)
2013
+Korg Wavedrum Global Edition
+Korg Volca Series
2014
+Korg electribe [sampler] - A music production station.