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

Function of the card:
CTRL-Oscillator, 10 KC Free Running (Crystal)
Ctrl osc 10kc free running crystal

Complemented Transistor Resistor Logic (CTRL) is IBM's term for a form of resistor-transistor logic.

Part number:371245

Field replacement part number:371245

Customer Eng reference number:729932

Used in:IBM 1401,IBM 1410

References:
2_2 SMS Cards, p113,114.
1410_SMS_VOL_1.pdf/1410_SMS_VOL_2.pdf, p2068.
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 23:40:34 2015.