You're both NOT looking...

Check the PRIMARY EXAMINER for United States Patent 4783734(The present invention is a development of the microcomputer described in our European patent specification No. 0113516, now being cited as prior art by the USPTO), and compare with the PRIMARY EXAMINER on the '584 patent.

Eng, David Y.

Now ask yourselves why the '584 was granted if the primary examiner could NOT find the former as prior art?

BACKGROUND OF THE INVENTION

The present invention is a development of the microcomputer described in our European patent specification No. 0113516. That specification describes the microcomputer with a memory and processor arranged to execute a plurality of concurrent processes and to provide synchronised communication between concurrent processes on the same microcomputer or interconnected microcomputers. However, the device described in that specification was arranged to transmit messages which were each of one word length. After execution of each message instruction one word is transmitted and subsequent message instructions are required in order to cause further words to be transmitted. In the case of a 16 bit machine each message would be of 16 data bits.

http://www.freepatentsonline.com/4783734.html

Be well