Maybe that poster got a bit tangled up in the story of
The CBM 900?
"
Introduced CeBIT 1985
Hardware Z8001 (16bit; 23bit address bus with segment registers; early protected mode architecture [OS and user ring levels]; RISC), 512K RAM (max 2MB), 20MB HD (ST225) with reported options to 40MB or 67MB, 5.25"1.2MB disk drive (similar to the SFD 1000). Centronics and IEEE-4888 ports.
The Commodore 900 ran a modified port of Mark Williams' Coherent UNIX v0.7.3 (some 0.7.2), a prototype version, and was intended as a mainframe-class machine with multitasking, timesharing, virtual memory, multi-user capabilities -- what you would expect from a Typical Un*x Mainframe. System adminstration was accomplished through an X-Windows-like GUI on the workstation version of the 900.
Eventual Fate Scrapped prototype; project officially discontinued in favour of the newly-acquired Lorraine, later becoming the Amiga. Some models, however, were released in Europe as development systems at around US$4000 apiece (!), even though the actual computer was never publicly released. 500 units produced."
Press Release from Commodore Microcomputers, Sep/Oct 1985
