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CHORUS SYSTEMS RELEASES NEW ADVANCED MICROKERNEL TECHNOLOGY; NEW MICROKERNEL AND UNIX IMPLEMENTATION EXPAND FUNCTIONALITY

 CHORUS SYSTEMS RELEASES NEW ADVANCED MICROKERNEL TECHNOLOGY;
 NEW MICROKERNEL AND UNIX IMPLEMENTATION EXPAND FUNCTIONALITY
 BEAVERTON, Ore., May 19 /PRNewswire/ -- New versions of the CHORUS technology, MiX and the Nucleus, are shipping today from Chorus Systems Inc., featuring advanced virtual memory/file support and higher performance.
 CHORUS/MiX is available in two versions, MiX V.3.2 r4.0, which is compatible with UNIX System, V Release 3.2 (SVR3.2), and MiX V.4 r1.2, which is compatible with UNIX System V Release 4.0 (SVR4). The same microkernel, Nucleus-v3r4.1, supports either version of MiX.
 The CHORUS Nucleus v3 is the heart of the family. The Nucleus provides a unified virtual machine interface for various operating system (subsystem) implementations, UNIX(R) being a prime example, and provides:
 -- A real-time executive which synchronizes and pre-emptively
 schedules priority-based tasks
 -- Modern, optimized Inter-Process Communication (asynchronous IPC
 and Remote Procedure Call (RPC)
 -- A low-level hardware supervisor which dynamically loads
 interrupt and trap handlers
 -- An advanced (optional) distributed virtual memory manager which
 optimizes distributed object copying.
 Binary compatible with UNIX SVR3.2, CHORUS/MiX v.3.2, first released in 1988, is built on the real-time CHORUS Nucleus microkernel as a set of distributed multi-threaded system servers. Chorus has developed several techniques to distribute, transparently and simply,
SVR3.2 programs and devices as well as files. The result is that multiple CHORUS nodes (machines) connected by a network and/or bus support a single system image of SVR3.2. In addition, all files and devices are transparently shared and available in a single file name space; processes may be transparently executed on remote sites; and all signal management is fully extended to the distributed environment.
 The reference machines are the Compaq Deskpro 386/20 and Portable 386, 486c. Other ports include: Motorola 680x0 and 88xxx, SPARC (Sun diskless), Compaq SystemPro (symmetric multi-processing version), Hewlett-Packard PA-RISC, Intel iPSC/2 (massively parallel supercomputer), and the Inmos transputer T805.
 CHORUS/MiX V4.0 utilizes the same architectural approach as CHORUS/MiX V3.2, (it is built on the real-time CHORUS Nucleus microkernel as a set of distributed multi-threaded system servers), and is fully binary compatible with UNIX SVR4, a first for microkernel technology in the industry. CHORUS/MiX 4.0 r1.2 inherits the distribution functionality of the Nucleus and provides an excellent base for designers implementing parallel systems, fault tolerant and/or real-time systems.
 CHORUS/MiX 4.0 uses the same reference machines. Other ports include Sun SPARC (Sun-4), Motorola 88xxx (Unisys S/8400), and the COMPAQ SystemPro (symmetric multi-processing version).
 Chorus Systems Inc., of Beaverton is the U.S. subsidiary of Chorus systemes, S.A., of France. The company designs and markets a family of operating systems based on the Chorus microkernel technology. Chorus provides computer system manufacturers, telecommunications equipment vendors and board-level computer vendors a powerful development environment in which to build next-generation open systems. CHORUS/MiX is the only commercially licensed microkernel- based System V distributed operating system. Among major hardware manufacturers that have publicly announced their choice of Chorus technology are Unisys, Alcatel, GPT (GEC-Plessey Telecom) and SHS- Thomas (INMOS). UNIX System Laboratories announced a strategic agreement and VAR relationship with Chorus Systems Inc. in November 1991.
 CHORUS is a registered trademark and CHORUS/MiX is a trademark of Chorus Systems Inc. UNIX is a registered trademark of UNIX System Laboratories Inc.
 -0- 5/19/92
 /CONTACT: Will Neuhauser of CHORUS Systems, 503-690-2300; or Jennifer Rothert of Regis McKenna, 415-354-4514, for CHORUS Systems/ CO: CHORUS Systems ST: California IN: CPR SU: PDT


MC-RM -- SJ007 -- 1644 05/19/92 08:30 EDT
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Date:May 19, 1992
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