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

Function of the card:
Alloy - Field Replacement
Two-Way AND (in-phase load)

Listed in 1401 SMS card usage

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

Part number: 371205

Used in: IBM 7070, IBM 729II, IBM 7090, 7030

Symbol:+A

+A: Positive AND. in-phase output is positive only when all inputs are positive. Out-of-phase output is negative for the above condition.

References: IBM Standard Modular System, Component Circuits, p17
This page created by Ken Shirriff on Wed Sep 15 18:15:09 2021.

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.