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

Function of the card:
SDTRL-Distributed Line Terminator with Optional Load Resistors
SDTRL dist line term w opt ld resist

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

Part number:370389

Field replacement part number:370389

Customer Eng reference number:729940

PCB number:484145

Used in:IBM 1401,IBM 1311 Disk,IBM 1410

References:
2_2 SMS Cards, p122.
1410_SMS_VOL_1.pdf/1410_SMS_VOL_2.pdf, p1106.
IBM 1311 ILD, p137.
This page created by Ken Shirriff, 2015.

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. Images courtesy of Randall Neff. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.

Creation time: Tue Mar 03 23:40:34 2015.