In 1986, "Computerworld" wrote that "Until very recently, almost no one associated Unix with corporate data processing. [...] the operating system traveled almost exclusively in academic and technical circles ... But now — almost entirely because of strenuous efforts by AT&T — some people are beginning to perceive Unix as a viable option for large commercial installations." Unix became commercially available for the mainframe via Amdahl UTS in 1981, and now IBM started offering Unix as IX/370 and VM/IX. The total installed base of Unix, however, remained small at some 230,000 machines.