This page describes the IBM SMS card "TCJ", and is part of the SMS card database.

Function of the card:
SDTRL- Distributed Line Terminator

Saturated Drift Transistor Resistor Logic (SDTRL) is a form of resistor-transistor logic using faster drift-field transistors.

Part number: 370333

PCB number: 493421

IBM SMS card type TCJ 370333 IBM SMS card type TCJ 370333 IBM SMS card type TCJ 370333 IBM SMS card type TCJ 370333

Image courtesy of Henk Stegeman

This page created by Ken Shirriff on Wed Sep 15 18:15:10 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on bitsavers.org, as well as information from the IBM 1401 restoration team, especially Tim Coslet's SMS data and Jim Hunt's data. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.