IBM is holding a four-hour briefing on Unix in New York today, at which it is expected to announce that it is abandoning its IX/370 mainframe version of the operating system, which runs under VM, in favour of a new native mainframe implementation of its AIX Unix, originally developed for the RT Personal Computer and now also announced for the PS/2 Model 80. AIX comes with an optional novices’ user interface, and adds IBM-specific communications.