Commodore built this prototype UNIX workstation/server computer in the same time frame as the Amiga and their PC-Clone and then decided that they only had production capacity for two out of three, and the CBM900 lost.
All the approx 300-500 prototypes were recalled for destruction, but due to some kind of “mistake” this particular machine, which was on loan to a favored customer in Denmark, never made it back.
The machine resurfaced when this company cleaned up their basement, and sent 3 euro-pallets of Commodore artifacts our way.
I never knew Commodore tried to build a UNIX workstation. I shouldn’t be surprised though; virtually everyone dabbled in UNIX workstations in the ’80s. This page has more information about the CBM900.