“The diagram … was drawn by Dr. Robert M. Metcalfe in 1976 to present Ethernet … to the National Computer Conference in June of that year. On the drawing are the original terms for describing Ethernet. Since then other terms have come into usage among Ethernet enthusiasts.”
Just as a reminder: in 1976, INTEL had just developed the 8080, which was running at an unbelievable speed of 4.77 MHz !!!