774 Part 4 ½ Family Range, Compatibility, and Evolution

Section 2 ½ Minicomputer Families

price data points in Fig. 8, it might be better to try two independent exponentials. The reason for this is that the data points really mark the transition between two generations. The PDP-5 was a mid-second (transistor) generation machine, and the PDP-8 represents a late second generation machine. The PDP-8/I and PDP-8/L were beginning third (integrated circuit) generation designs. These four machines represent a relatively rapid evolution from 1963 to 1968. After the PDP-8/L, the evolution slows