The Commodore 900 (also known as the C900, Z-8000, and Z-Machine) was a prototype microcomputer originally intended for business computing and, later, as an affordable UNIX workstation. It was to replace the aging PET/CBM family of personal computers that had found success in Europe as business machines. The project was initiated in 1983 by Commodore systems engineers Frank Hughes, Robert Russell, and Shiraz Shivji. Manufacturing was to commence in 1985 at Commodore International's West Germany plant, but only fifty prototypes were made and sold as development systems before the project was cancelled.