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

Function of the card:
SDTRL mup #1

Saturated Drift Transistor Resistor Logic (SDTRL) is a form of resistor-transistor logic using faster drift-field transistors.

A Multiple-Use Package (MUP) card has circuits jumpered together directly on the card to form more complex circuits.

Part number: 370229

PCB number: 484049 , hole pattern: 493460

Used in: IBM 1410

Cap code: None (details)

References: 1410_SMS_VOL_1.pdf, p46

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.