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

Function of the card:
SDTDL 2-way logic block low speed without loads
SDTDL-2 Way Logic Block Low Speed without Loads
4-2 way-no load
SDTDL 2 way logic blk low sp w/o lds

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: 370379

SLT modules: 2399110

Customer Eng reference number: 729914

PCB number: 484027

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

Cap code: None (details)

IBM SMS card type DGU 370379 IBM SMS card type DGU 370379 IBM SMS card type DGU 370379 IBM SMS card type DGU 370379 IBM SMS card type DGU 370379 IBM SMS card type DGU 370379 IBM SMS card type DGU 370379 IBM SMS card type DGU 370379 IBM SMS card type DGU 370379 IBM SMS card type DGU 370379

Image courtesy of Henk Stegeman
Image courtesy of Roberto Gonzalez Rocha

References: 1410_SMS_VOL_1.pdf, p103
Coslet data
IBM 1443 ALD, p95
2_2 SMS Cards, pp84,85
IBM 2821 CCD, p51
IBM 1311 ILD, p122

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.