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

Function of the card:
Alloy - Prolay Pulse (One Half)

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

Part number: 371445

Used in: IBM 729, 7030, IBM 7090

Symbol:SS

SS: Single Shot. Provides a monostable output which can be pulsed into its quasi-stable state for a predetermined duration. with each input triggering pulse or triggering voltage change. Once triggered, the output pulse duration becomes independent of input time duration or amplitude.

References: Drawing courtesy of Living Computers: Museum + Lab
This page created by Ken Shirriff on Wed Sep 15 18:15:10 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.