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

Function of the card:
Amplifier – Error Voltage, Positive

Listed in 1401 SMS card usage

Part number: 371920

Used in: IBM 729II, IBM 7090, 7030


IBM SMS card type YW 371920 IBM SMS card type YW 371920

This page created by Ken Shirriff on Wed Sep 15 18:15:09 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.