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

Function of the card:
Gated Sample Pulse Driver 2 (VM, 6v out)
Alloy - Gated S.P.D. No.2 (VM-6)

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

Part number: 371042

Used in: IBM 1410


DSP: Driver, Sample Pulse. Same as D, with the additional function of supplying a specific length pulse output when the input consists of a gate and a sample pulse spike. The input may also be the output of a current switching circuit without a gate.

References: IBM Standard Modular System, Component Circuits, pp206,207
1410_SMS_VOL_2.pdf, p60
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.