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

Function of the card:
Alloy-Driver, Current

Listed in 1401 SMS card usage

Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.

Part number: 370443

PCB number: 492705

Used in: IBM 1401

IBM SMS card type DKA 370443 IBM SMS card type DKA 370443 IBM SMS card type DKA 370443 IBM SMS card type DKA 370443

Image courtesy of Henk Stegeman

References: 2_2 SMS Cards, pp12,13
Coslet data
This page created by Ken Shirriff on Sun Dec 16 16:11:05 2018.

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.