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

Function of the card:
SDTRL - Indicator Driver, 40 MA
SDTRL - indicator driver, 40 ma
SDTRL-indicator driver 40 ma

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

Part number: 371941

PCB number: 493233

Used in: IBM 1414 I/O Synchronizer, IBM 1410, 7030

References: 1410_SMS_VOL_2.pdf, p117
National Museum of Computing.
This page created by Ken Shirriff on Wed Sep 15 18:15:11 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on, 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.