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

Function of the card:
Inverters,. power-pnp without input capacitors
Inverters, Power - PNP Without Input Capacitors
Ctrl-inverters pwr-pnp wo input cap

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

Part number: 371478

Used in: IBM 1414 I/O Synchronizer, IBM 1410

References: 1410_SMS_VOL_2.pdf, p81
National Museum of Computing.
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.