S203

This document is a proprietary electronic schematic for a Digital Equipment Corporation (DEC) Triple Flip-Flop S203 circuit, copyrighted in 1965 and intended solely for test and maintenance purposes.

The schematic details three distinct flip-flop stages. Key component specifications are provided:

• Transistors: DEC 3639C (EIA 2N3639)
• Diodes: D-664 (EIA IN3606) and D-662 (EIA IN645)
• Resistors: Generally 1/4W, 5% tolerance
• Capacitors: Typically MMFD (picofarads), with one specifically noted as .01 MFD.

The circuit utilizes +10V, Ground, and -15V power supplies. The document includes a transistor and diode conversion chart and a note to "USE THE ETCH BOARD OF THE R203," with revisions dated June 1965.