The 3B20D Processor & DMERT Operating System: 3B20D Processor & DMERT as a Base for Telecommuncations Applications
01 January 1983
The 3B20D Processor and the Duplex Multienvironment Real-Time (DMERT) operating system were designed to provide a base for a wide variety of high-availability real-time and time-sharing applications. The wide applicability of the 3 B 2 0 D / D M E R T combination is due to the flexible hardware configuration of the processor coupled with the multilevel structure of the D M E R T operating system. The versatile, intelligent input/output processor and the high-speed dedicated dual-serial channels provide for varying peripheral configuration interconnection needs. 1 ' 2 The microcode support for multiple resident instruction sets and the operating system support for application software at several different operating system functionality levels provide the diverse operating environment needs of teleprocessing system applications as well as data processing oriented applications. ' The combined 3B20D Processor and D M E R T operating system can be viewed as a hierarchy of capability levels. This is depicted in Fig. 1. The lowest capability level is the 3B20D Processor hardware and 171