Dc Carry Chain S181

This document is a technical schematic for a "DC Carry Chain" circuit manufactured by the Digital Equipment Corporation in 1965. The circuit consists of seven transistor stages (Q1 through Q7) controlled by a series of resistors and diodes. The schematic includes a comprehensive parts list detailing the specific transistors, resistors, diodes, and capacitors required, along with a transistor and diode conversion chart. The document notes that it is intended strictly for test and maintenance purposes and contains proprietary information.