Transistor and Diode Conversion Chart

Summary This document is a technical schematic for an "Adder B138" circuit designed by the Digital Equipment Corporation in 1967. It details the electrical connectivity of various transistors (e.g., DEC 3009B, 3639B, 3009A) and diodes (e.g., D668, D664) used to manage signal inputs and voltage outputs (+10V, +6V, +5.25V, -2.1V, -6V, -15V). The diagram includes a specific section for a "Carry Insert" function and illustrates how components are arranged to perform arithmetic logic, with notes on resistor specifications and grounding configurations.