What kind of keybed is mounted on the DMC-122?

The DMC-122 is equipped with two 61-key "waterfall" semi-weighted keybeds manufactured by Fatar model "TP-8o" where the letter 'o' stands for 'organ'. You can see the specs on their web page at:
http://www.fatar.com/pages/TP_8O.htm

This is an industry standard that you will find on many other instruments such as the Crumar Mojo, some of the Nord Electro and C series, the Hammond-Suzuki SK series, the Korg CX/BX series and many others.

The profile of this keyboard is faithful to that of a vintage Hammond console and the playbility is very comfortable, especially if we consider that, when the 'velocity' feature is off on the DMC-122, only the upper bubble contact is used in order to have a faster response. Tipically, the key will trigger a note when it is just 2 millimeters down.

With the right velocity curve, this kind of keyboard can be very expressive, comfortable and responsive with piano sounds as well. The DMC-122 has 3 pre-programmed velocity curves plus other 3 user-programmable via the GUI editor.