Abstract
A large class of problems may be solved by small, dedicated systems composed of several independent microcomputers connected in a simple way, without sophisticated interconnection networks. The systems here considered have a rigid, star-like architecture where a number of nodes — System Elements represented by independent microcomputer stations — are connected to a Central System Element via Dual Port Memory (DPM) modules. Each of DPM modules (representing the only non conventional hardware requested to build up the system) is shared between the Central System Element and the ordinary Element connected to the second port. Interaction between processes is on the message basis. Process-owned mailbox concept is adopted all over the system for message dispatching and retrieving. Primitives for message exchange and supporting data structures are presented as well as an operating system kernel allowing more than one process running on each microprocessor.
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