RTXC (MCS supported)

RTXC is a real-time, multitasking kernel for embedded applications, and provides supports for all versions of the Intel 80196, 8051 and 80251 controllers. RTXC was first released in 1978 in assembly language converted to C in 1985.
RTXC is a flexible, field-proven real-time kernel used in a wide variety of embedded applications. RTXC manages tasks and time, synchronizes with events and permits transferal of data between tasks. RTXC supports preemptive, round robin and time-slice task scheduling. RTXC is ROMable, supplied with source code and free of any runtime royalties. RTXC is simple, logical and easy to understand. The Nohau emulator supports interoperability with RTXC.
RTXC is delivered ready to use, ported to the specific processor and compiler you are using. The 650 page user manual is well organized and indexed, complete with application notes.
RTXC is supplied with one year free technical support including automatic software updates.