Sun Microsystems’ East Coast operation in Billerica, Massachusetts is working on a line of low-end workstations that will run a new operating system, OS/4, that is expected to combine MS-DOS with Berkeley 4.X Unix, according to Computer Systems News. The US trade weekly suggests that the technical personal computers, due out in the autumn, are likely to use the 80386 microprocessor. Sun will say only that it will continue to offer new workstations in the $5,000 and up market.