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

Function of the card:
Alloy-Hammer Driver Latch (High Speed)
Alloy hammer driver latch high speed
Alloy hammer driver latch (high speed)
Alloy Hammer Driver Latch (High Speed)

Listed in 1401 SMS card usage

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

Part number: 371415

PCB number: 493237

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


D: Driver. Isolates a signal from its generating source and uses it to drive one or more other circuits without affecting or overloading the generating circuits. Can be used to supply the required power directly or only to activate the circuit through which power is actually supplied.
IBM SMS card type AEN 371415 IBM SMS card type AEN 371415

References: 1410_SMS_VOL_2.pdf, p77
Coslet data
National Museum of Computing.
1_2 SMS Cards, p62
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, 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.