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

Function of the card:
Current Mode 4-N Indicator Driver

Part number: 371050

Used in: 7030

Symbol:DI

DI: Driver, Indicator. Driver operating into an indicating device.

References: IBM Standard Modular System, Component Circuits, p218
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.