Counting Gate B166

This document is a technical schematic for a Digital Equipment Corporation "Counting Gate B166" circuit board, dated 1967. The diagram illustrates an electronic configuration consisting of a series of 2N4258 transistors (Q1 through Q9) and numerous D662 and D664 diodes. The circuit is designed with a +10V and -15V power supply rail, incorporating 68,000 ohm and 7,500 ohm resistors to manage signal flow. The schematic provides the necessary layout for the integration of these components on a printed circuit board.