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

Function of the card:
SDTDL-sdtrl-144okc crystal oscillator
SDTL-SDTRL-1440KC Crystal Oscillator

Saturated Drift Transistor Diode Logic (SDTDL) is a form of Diode-transistor logic using faster drift-field transistors.

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

Part number: 372179

Used in: IBM 1410

Cap code: None (details)

References: 1410_SMS_VOL_2.pdf, p144
National Museum of Computing.

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.