Function of the card:
Alloy-Indicator Driver 40 mA
High Current Indicator Driver
Indicator driver 4o ma
Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.
Part number:371546
Field replacement part number:371546
Customer Eng reference number:729883
Used in:IBM 1401,IBM 7070,IBM 1410
Symbol:DI
DI: Driver, Indicator. Driver operating into an indicating device.
Family: CTDL high speed
IBM Standard Modular System, Component Circuits, p166.
2_2 SMS Cards, p41.
1410_SMS_VOL_1.pdf/1410_SMS_VOL_2.pdf, p2091.
This page created by Ken Shirriff, 2015.
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. Images courtesy of Randall Neff. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.
Creation time: Tue Mar 03 23:40:34 2015.