Motorola Computer Systems yesterday added four 25MHz and 20MHz 68030-based models to its System 8000 line of integrated workgroup Unix systems. The Models 310 and 610 are based around the firm’s new single board computers, and support 12 to 20 users. The Models 650 and 850 extend support to between 66 or 128 users, and more can be added by using an Ethernet local network. The 310 starts at $10,000, out next month; the 610 at $22,000, September; the 650 in June at $30,000 and the Model 850 in July, at $40,000.