R201

This document is a proprietary circuit schematic for a "FLIP-FLOP R201" from Digital Equipment Corporation (DEC), copyrighted in 1964 and intended solely for test and maintenance purposes.

The schematic details a flip-flop circuit primarily built around two DEC3639C (EIA 2N3639) transistors, numerous D-662 and D-664 diodes, resistors, and capacitors. General specifications indicate resistors are 1/4W, 5%, capacitors are in MMFD (picofarads) unless otherwise noted, and diodes are D-664 by default.

The circuit features multiple inputs (e.g., OE, OH, OF, OP, OS, OU), "I" and "0" labeled outputs, and operates with +10V, Ground, and -15V power supplies. The document also includes a transistor conversion chart and revision history.