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

Function of the card:
3-4 way-a-0 load
SDTDL 3-4 way, -a-o load

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

Part number: 372206

Customer Eng reference number: 734310

PCB number: 493457

Used in: IBM 1443 Printer, IBM 2821 Control Unit

References: IBM 1443 ALD, p82
IBM 2821 CCD, p25
This page created by Ken Shirriff on Wed Sep 15 18:15:11 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on, 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.