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

Function of the card:
SDTRL clamp - (-6.85v)
SDTRL Clamp (-6.85v)
SDTRL clamp -6.85v

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

Part number: 371942

PCB number: 493235 , hole pattern: 491450

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

IBM SMS card type DEB 371942 IBM SMS card type DEB 371942

References: National Museum of Computing.
1410_SMS_VOL_2.pdf, p118
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 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.