Four Flip-Flops B204

This document is a technical schematic diagram for a "Four Flip-Flops B204" circuit module, produced by Digital Equipment Corporation in 1964. The diagram illustrates an electronic circuit containing nine transistors (Q1 through Q9), a series of diodes (D1 through D19), and multiple resistors and capacitors arranged to form flip-flop logic stages. The schematic includes specific component values, such as resistor ratings of 1/4W (5% tolerance) and the use of DEC2894-1B transistors. It also features a "Transistor & Diode Conversion Chart" detailing component types (e.g., D664/IN3606, D662/IN645) and includes formal approval and revision blocks for the design.