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

Function of the card:
Two of Five Validity Check Circuit

Part number:371504

Used in:IBM 7070

Symbol:VCK

VCK: Validity Check. Used for checking information bits in the 2-of-5 bit code system.

Family: current mode

References:
IBM Standard Modular System, Component Circuits, p120,121,122.
This page created by Ken Shirriff, 2015.

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. Images courtesy of Randall Neff. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.

Creation time: Tue Mar 03 23:40:33 2015.