Chorus Systems, the world leader in open microkernel operating system
technology, announced today the availability of CHORUS/ClassiX, a
first-class real-time execution and development environment for
distributed embedded systems based on the CHORUS Nucleus open microkernel
standard.

CHORUS/ClassiX targets system and application developers serving the
telecommunications, internetworking and real-time markets. Real-time
programmers can now take advantage of the open systems' benefits offered
by CHORUS in a powerful, remote UNIX development and debugging
environment.

CHORUS/ClassiX product overview

CHORUS/ClassiX combines the CHORUS Nucleus with a "c_actor" subsystem. It
is intended to support operating system servers and embedded applications
and provides transparent access to external Unix hosts. CHORUS/ClassiX
comes with a cross-development environment allowing "c_actors" to be
developed, debugged and configured remotely from the Unix host system.
CHORUS/ClassiX directly benefits from the maturity of the CHORUS open
microkernel standard, widely used in the computer and telecommunication
industries.

"c_actor" (servers) programming interface 

The "c_actor" programming interface provided by CHORUS/ClassiX is a
powerful complement to the CHORUS Nucleus native programming interface, as
well as to application interfaces such as UNIX or POSIX real-time
extensions, provided by other subsystems implemented on top of the CHORUS
Nucleus (e.g., CHORUS/MiX). CHORUS/ClassiX offers programmers transparent
access to remote UNIX file systems through NFS, full BSD Sockets over
TCP/IP, and more than 100 system calls and library functions for I/O,
string handling, character handling, and network handling. Disk drivers
can be integrated to access a local disk.

Portability and flexibility:

CHORUS/ClassiX provides an open microkernel-based architecture that is
fully portable on all hardware platforms and easily tailored to specific
hardware and software configurations (e.g., integrating additional
operating system servers for extended functionality, or device drivers to
manage local peripherals).

Interoperability:

In addition to CHORUS location-transparent Inter-Process Communication
(IPC) services, CHORUS/ClassiX offers TCP/IP sockets, NFS-based UNIX
input/outputs, and many other utilities. These allow programmers to
transparently integrate real-time remote targets into open Unix
environments. They also allow users to extend deployed embedded
applications with standard communication protocols.

Development environment:

The first version of CHORUS/ClassiX supports a Sun/OS development
environment. Future releases will support similar development environments
on other popular host systems.

Distributed real-time applications programmed as "c_actors" (servers) on
CHORUS/ClassiX are dynamically loaded, controlled and debugged remotely
from a Unix host, using the GDB debugger (extended by Chorus Systems to
support multithreaded applications).

Users can run and debug CHORUS/ClassiX applications in either user or
supervisor mode. Running applications in user mode provides full
protection and makes debugging easy in the development phase. Running
applications in supervisor mode allows programmers to manage hardware
events like interrupts or traps, and guarantees minimum context switching
times.

CHORUS/ClassiX applications can be transparently distributed on multiple
target systems using the CHORUS kernel-to-kernel connectivity services
(CHORUS IPC).

Product availability:

CHORUS/ClassiX is delivered as a SOURCE CODE operating system product. It
is available now from Chorus Systems to OEMs, VARs, systems integrators,
and end users worldwide. Initial implementations include target platforms
based on Intel x86, Motorola 68K, and Sun SPARC with SunOS-based hosts.
Other target platforms, including PowerPC and MIPS R3/4000, and popular
host systems will follow. Binaries for ix86 platforms are available under
specific evaluation programs.

Customer service and support:

Chorus Systems offers customer support services including training, design
and/or implementation consulting and on-site assistance to help customers
integrate CHORUS/ClassiX quickly and easily into their specific
environment. In addition, Chorus Systems provides updates and new releases
of product under maintenance contracts.

Background on Chorus Systems:

Chorus Systems has established CHORUS as the de facto open microkernel
standard in the electronics industry, and its CHORUS/MiX microkernel-based
multi-server implementation of UNIX System V as the open operating system
architecture of choice in the telecommunications and computer markets. The
result of over fourteen years of development by experts in advanced
distributed communications and computing systems, CHORUS open
microkernel-based systems software products have been available
commercially for more than six years and have the maturity and robustness
required by leaders in the electronics industry. Chorus Systems' customers
and partners are prominent industry leaders such as Alcatel, Cray
Research, Fuji Electric, Fujifacom, Fujitsu, GEC-Plessey Telecom, ICL,
Motorola Semiconductors, SGS-Thomson (INMOS), The Santa Cruz Operation,
Inc. (SCO), Tandem, and Unisys. In addition, Chorus has a strategic
relationship with Novell, which has made an investment in Chorus Systems,
and has selected CHORUS as the microkernel base for its future operating
system architecture.

Chorus Systems, Inc.            Chorus Systems, SA
18 Park Avenue                  6, avenue Gustave Eiffel
Los Gatos,  CA  95030           F-78182 Saint-Quentin-en-Yvelines cedex
U.S.A.                          France
Phone:  +1 (408) 399-8830       Phone:  +33 (1) 30 64 82 00
Fax:  +1 (408) 399-8835         Fax:  +33 (1) 30 57 00 66
E-mail:  info@chorus.com        E-mail:  info@chorus.fr

Chorus Systems, K.K.
Mitsutake Building Ikejiri, 8F
Ikejiri 3-22-4
Setagaya Ku, Tokyo 154
Phone:  +81 (3) 5430-1131
Fax:  +81 (3) 5430-1133
E-mail:  cb@chorus.com

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