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

Function of the card:
SDTDL-5-way logic block low speed with loads
SDTDL 5 way logic blck low sp w lds
2-5 way-load
SDTDL-s-way logic block low speed with loads
SDTDL-5-Way Logic Block Low Speed with Loads

Listed in 1401 SMS card usage
Exists in SLT version.

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

Part number: 370376

SLT modules: 2399110, 361431

Customer Eng reference number: 729917

PCB number: 484031

Used in: IBM 1401, IBM 1410, IBM 2821 Control Unit, IBM 1311 Disk, IBM 1443 Printer

IBM SMS card type DGX 370376

References: Coslet data
2_2 SMS Cards, p90
IBM 1443 ALD, p98
IBM 2821 CCD, p54
1410_SMS_VOL_1.pdf, p100
IBM 1311 ILD, p123
This page created by Ken Shirriff on Wed Sep 15 18:15:10 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.