Real time multiprocessor system having a write only data link connected to one of the ports of the memory of each of the processor nodes

A real time data processing system comprising:

• a plurality of processing nodes;
• and
• write only reflective data link means for transferring memory writes only between the plurality of processing nodes, including a memory coupling bus connected to each of said plurality of processing nodes,
• each of said nodes having (1) a local bus, (2) a processor coupled to the bus, (3) a memory having at least two means for transferring information to and from the memory so that a first means of said two means couples the memory to the local bus and a second means of said two means couples the memory to the data link means to transfer a memory write from another node to the memory without intervention of said processor, and (4) sensing means connected to the local bus for sensing a write to the memory and then transmitting said write to the memory coupling bus for broadcast to other nodes,
• at least one of said nodes further including a VMEbus connected to a third means for transferring information to and from the memory of said at least one node and adapted for inputting to and outputting from said memory of said at least one of the nodes via said third means, said VMEbus primarily serving to receive input and to provide output for said at least one node.