{"id":23317,"date":"2026-04-05T13:48:03","date_gmt":"2026-04-05T11:48:03","guid":{"rendered":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/?p=23317"},"modified":"2026-04-17T18:02:39","modified_gmt":"2026-04-17T16:02:39","slug":"commodore-900-c900-z-8000-prototype","status":"publish","type":"post","link":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/2026\/04\/05\/commodore-900-c900-z-8000-prototype\/","title":{"rendered":"Commodore 900 \/ C900 \/ Z-8000 [Prototype]"},"content":{"rendered":"

Commodore 900 <\/strong>\/ C900 \/ Z-8000 [Prototype]<\/strong><\/p>\n

Found after decades in March 2026 in an unstable attic in a house at risk of collapsing, this is the true “untested attic find”.<\/p>\n

Also known as the “Z-Machine” for its processor, the Commodore 900 never left the prototype state. Most sources talk about only 50 units built. Classified as a mainframe computer, the 900 runs a version of UNIX called “Coherent” in order to give it its multi-tasking and multi-user capabilities.
\nThe Commodore 900 (also called the Z-8000 on early design materials) came in two variants: Model 1 [the server], and Model 2 [the workstation].
\nThe workstation offers the high-res video capabilities the server lacks, which in turn has more I\/O ports. Apart from the sandwich video board both machines are identical.<\/p>\n

This model is the server version with the low-res video board and the two extra serial ports.<\/p>\n

Currently the machine is undergoing full testing and restoration.<\/p>\n