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

Function of the card:
Current Mode to CTDL Power Inverter

Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.

Part number: 371558

Used in: IBM 7070

Cap code: None (details)

Symbol: IP

IP: Inverter, Power. Performs function of an inverter white also driving a line.

References: IBM Standard Modular System, Component Circuits, p167

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.