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

Function of the card:
Mc oscillator
Oscillator imc
SDTDL-SDTRL- 1 MC Oscillator

Listed in 1401 SMS card usage

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: 370551

Customer Eng reference number: 729947

Used in: IBM 1443 Printer, IBM 1410, IBM 1401

Cap code: None (details)

IBM SMS card type TDK 370551 IBM SMS card type TDK 370551 IBM SMS card type TDK 370551 IBM SMS card type TDK 370551

Image courtesy of Göran Axelsson

References: 2_2 SMS Cards, pp135,136
Coslet data
1410_SMS_VOL_2.pdf, p20
IBM 1443 ALD, p113

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.