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

Function of the card:
Drift – Oscillator 2.75 MC Free Running (Crystal)

Part number: 371677

Used in: IBM 7090

Cap code: None (details)

Symbol: OSC

OSC: Oscillator. A free-running non-stable muitivibrator used to provide pulses of a given frequency and amplitude.
IBM SMS card type UK 371677 IBM SMS card type UK 371677

Image courtesy of Christoph Methfessel

References: Drawing courtesy of Living Computers: Museum + Lab

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.