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

Function of the card:
SDTDL non inverting power driver
SDTDL-Non-Inverting Power Driver
SDTDL non-inverting power driver
Emitter follower

Listed in 1401 SMS card usage
Quad Emitter Follower

Saturated Drift Transistor Diode Logic (SDTDL) is a form of Diode-transistor logic using faster drift-field transistors.

Part number: 370226

Customer Eng reference number: 729911

PCB number: 484043 , hole pattern: 491329

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

Cap code: None (details)

Symbol: DP

DP: Driver, Power. A power driver used to drive Into multiple bases.
IBM SMS card type DFR 370226 IBM SMS card type DFR 370226 IBM SMS card type DFR 370226 IBM SMS card type DFR 370226

Pinout:

A O1
B O2R
C I1
D I2
E O2
F O1R
G O4R
H I3
J GND
K +?V
L O3
M -12V
N
P I4
Q O4
R O3R
References: 2_2 SMS Cards, pp79,80
1410_SMS_VOL_1.pdf, p43
IBM 1443 ALD, p93
IBM 1311 ILD, p116
IBM 2821 CCD, p44
Coslet data

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.