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

Function of the card:
Tdl and trl load card
1.6k resistor
TDL & TRL Load Card
Tdl & trl load card

Listed in 1401 SMS card usage

Part number: 370232

Customer Eng reference number: 729909

PCB number: 492345 , hole pattern: 493457

Used in: IBM 1401, IBM 1410, IBM 2821 Control Unit, IBM 1311 Disk, IBM 1414 I/O Synchronizer, IBM 1443 Printer


R: Load. Provides proper terminating impedance or optimum coupling of one circuit to another at the correct operating voltage level.
IBM SMS card type DFJ 370232 IBM SMS card type DFJ 370232 IBM SMS card type DFJ 370232 IBM SMS card type DFJ 370232

References: IBM 1443 ALD, p91
2_2 SMS Cards, pp76,77
Coslet data
1410_SMS_VOL_1.pdf, p49
IBM 2821 CCD, p42
IBM 1311 ILD, p115
This page created by Ken Shirriff on Wed Sep 15 18:15:11 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.