The Theos 386 multi-user, multitasking operating system from Theos Software Inc, Walnut Creek, California is finally commercially available although the company has been touting the virtues of the thing for over a year now (CI No 759). Theos, for those with long memories, is the direct successor of Oasis, which started out on Z80 machines and graduated to the iAPX-86 family, and was renamed in 1985 after legal hassles (CI No 271). The new version addresses up to 4Gb of physical memory, and up to 64Tb of virtual, uses the 386 protected mode and can support up to 128 users on an 80386 machine. The company is also offering Theos C, which it claims enables C programs written for Unix and MS-DOS to be recompiled and run on machines running Theos, which also implements a hierarchical directory structure said to be Unix like. A Cobol for Theos was in the plan a year ago, as was a windowing environment. Single-user Theos is $400, a development kit is $1,600; it is sold here by Midshires Computer Services, Crewe.