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

Function of the card:
SDTRL MUP Number 15
Mup number 15
SDTRL mup number 15

Dual RS Flip-Flop

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: 370204

PCB number: 747237 , hole pattern: 490374

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

Symbol:AL

IBM SMS card type DFD 370204 IBM SMS card type DFD 370204 IBM SMS card type DFD 370204 IBM SMS card type DFD 370204 IBM SMS card type DFD 370204 IBM SMS card type DFD 370204 IBM SMS card type DFD 370204 IBM SMS card type DFD 370204

Image courtesy of Roberto Gonzalez Rocha
Image courtesy of Henk Stegeman

Pinout:

A *Q1
B *S1
C Q2
D *Q2
E R1
F R1
G Q1
H *R1
J GND
K *R2
L *S2
M -12V
N +12VM
P R2
Q R2
R R2
References: 1410_SMS_VOL_1.pdf, p21
Coslet data

This page created by Ken Shirriff on Thu Sep 16 16:40:54 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.