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

Function of the card:
SDTRL-Oscillator, 115 KC S Line Gated
SDTRL - oscillator, 115 kc s line gated

Listed in 1401 SMS card usage

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

Part number: 370295

PCB number: 493327

Used in: IBM 1410, IBM 1401

Cap code: None (details)

References: 2_2 SMS Cards, p117
1410_SMS_VOL_1.pdf, p80
Coslet data

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.