RTEMS is a freely available, royalty free real-time executive with multiprocessor capabilities. RTEMS' design provides performance and capabilities are comparable to those of the best commercial executives. The directive execution times and other critical performance measures such as interrupt latency are best of class. RTEMS was developed by On-Line Applications Research Corporation (OAR) under contract to the U.S. Army Missile Command. RTEMS includes support for multiple APIs. Currently RTEMS supports a POSIX threads API, and an RTEID based API which is similar to pSOS+. RTEMS includes a number of advanced real-time features including optional rate monotonic scheduling support, binary semapahores with priority inheritance, and watchdog timer functions. RTEMS includes a port of the FreeBSD TCP/IP stack that has high performance on very modest hardware. A remote debug server is supported on some targets that allows debugging across the network. RTEMS provides a rich run-time environment with a reentrant C library, POSIX 1003.1b support, and file system support. It also includes optional debug aids like stack overflow and heap integrity checking. RTEMS is built using GNU autoconf and can be built on any host supporting the GNU tools including Linux, FreeBSD, NetBSD, Solaris, and MS-Windows to name but a few. The current RTEMS release supports a the following CPU families: Motorola m680x0, m683xx, and ColdFire Motorola and IBM PowerPC (4xx, 6xx, 7xx, and 8xx) Hitachi SH-1 Intel i386, i486, Pentium, and i960 SPARC MIPS HP PA-RISC AMD A29K There are over 35 Board Support Packages included with RTEMS including BSPs for the SPARC and PowerPC simulators included with gdb. There are numerous BSPs for CPUs targetting the embedded market such as the Motorola m683xx and mpc8xx series which support the on-CPU peripherals. WWW: http://www.OARcorp.com E-mail: rtems-info@OARcorp.com or Joel Sherrill (joel@OARcorp.com)