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

Function of the card:
6 Volt. Diff. Amplifier
6 volt diff. amplifier
Power supply
6 Volt Diff Amplifier

Listed in 1401 SMS card usage
Replacement for QU.

Part number: 370612

Used in: IBM 1401, IBM 1410, IBM 1414 I/O Synchronizer, 7040

References: 1410_SMS_VOL_2.pdf, p27
1_2 SMS Cards, pp21,22
Coslet data
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.