C EXECUTIVE and PSX from JMI Software Systems, Inc. are real-time, multi-tasking,ROMable kernels for embedded systems. C EXECUTIVE is available for 8-, 16- and 32-bit CISCprocessors, a wide variety of RISC processors, and DSP. It provides fast context switching,small kernel size, and support for over 20 processors. Optional DOS-compatible file system,TCP/IP, and SNMP are also available. PSX provides an optional subset of POSIX.1 system calls.