Action Instruments Inc of San Diego, California says that it will be producing a new version of its proprietary IC-DOS real-time, multi-tasking operating system this quarter. The operating system, for use on the IBM Personal XT and AT, will now have Unix System V compatibility and run MS-DOS as a task under IC-DOS. Action is currently porting IC-DOS to the 80386 and has plans to produce a version that runs MS-DOS under Unix.