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

Function of the card:
SDTRL mup number 8
Mup number 8

Penta 2 Input NAND w/ Common Input (L), Inverter

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: 370211

PCB number: 747239 , hole pattern: 490375

Used in: IBM 1620, IBM 1410, IBM 1414 I/O Synchronizer

IBM SMS card type DEW 370211

Image courtesy of Living Computers Museum+Labs


A I1
B O1
C O6
D O3
E O4
F O5
G O2
H I2
K I6
M -12V
N +12VM
P I3
Q I4
R I5
References: 1410_SMS_VOL_1.pdf, p28
Coslet data

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.