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

Function of the card:
SDTDL-Double Level Logic Block #2A Low Speed, wo Loads
Sdttl dbl level lb #2a low sp wo lds

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

Part number:370358

Field replacement part number:370358

Customer Eng reference number:729927

PCB number:484135

Used in:IBM 1401,IBM 1410

References:
2_2 SMS Cards, p103,104.
1410_SMS_VOL_1.pdf/1410_SMS_VOL_2.pdf, p1092.
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 23:40:33 2015.