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

Function of the card:
Alloy-diodes, type aas
Alloy-Diodes, Type AAs
Alloy diodes type aas

Listed in 1401 SMS card usage

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

Part number: 370564

Customer Eng reference number: 729902

PCB number: 492343

Used in: IBM 1410, IBM 1401, IBM 2821 Control Unit

Cap code: None (details)

IBM SMS card type AJT 370564 IBM SMS card type AJT 370564

References: 2_2 SMS Cards, p68
1410_SMS_VOL_2.pdf, p22
IBM 2821 CCD, p19
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.