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

Function of the card:
Drift-Driver Resistor
Drift-Driver, Resistor

Listed in 1401 SMS card usage

Part number: 371199

Used in: IBM 1401, IBM 1410, 7030

Symbol:R

R: Load. Provides proper terminating impedance or optimum coupling of one circuit to another at the correct operating voltage level.

References: 2_2 SMS Cards, p111
Coslet data
National Museum of Computing.
1410_SMS_VOL_2.pdf, p67
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 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.