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

Function of the card:
2-5 way-no load
SDTDL-5 Way Logic Block Low Speed without Loads
SDTDL 5 way logic block low speed without load
SDTDL 5 way logic blk low sp w/0 ld

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: 370375

SLT modules: 2399110, 361431

Customer Eng reference number: 729918

PCB number: 484031

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

IBM SMS card type DGY 370375 IBM SMS card type DGY 370375 IBM SMS card type DGY 370375 IBM SMS card type DGY 370375 IBM SMS card type DGY 370375 IBM SMS card type DGY 370375

Image courtesy of Henk Stegeman

References: 1410_SMS_VOL_1.pdf, p99
2_2 SMS Cards, p91
Coslet data
IBM 1443 ALD, p99
IBM 1311 ILD, p124
IBM 2821 CCD, p55
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 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.