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

Function of the card:
Alloy punch magnet driver
Alloy Punch Magnet Driver

Triple 2 Input Latched Magnet Driver 220mA

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

Part number: 370337

Used in: 1622, IBM 1620

Cap code: None (details)

Symbol: DPM

Pinout:

A I1
B I1
C O1
D I2
E I2
F I3
G O3
H O2
J GND
K
L RST
M -12V
N +12VM
P I3
Q
R
References: IBM 1620 FE Catalog
IBM 1620 Instructional System Diagrams, p473
Coslet data

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.