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

Function of the card:
CTDL-Emitter Follower – PNP
Ctrl emitter follower - pnp
DTDL Emitter Follower - PNP
Ctdl emitter follower-pnp

Listed in 1401 SMS card usage

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

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

Part number: 371365

Used in: IBM 1401, IBM 1410, 7030, IBM 1414 I/O Synchronizer

IBM SMS card type PP 371365 IBM SMS card type PP 371365 IBM SMS card type PP 371365 IBM SMS card type PP 371365 IBM SMS card type PP 371365 IBM SMS card type PP 371365 IBM SMS card type PP 371365 IBM SMS card type PP 371365

Image courtesy of Randall Neff
Image courtesy of Henk Stegeman

References: 2_2 SMS Cards, p52
1410_SMS_VOL_2.pdf, p75
Coslet data
National Museum of Computing.
This page created by Ken Shirriff on Wed Sep 15 18:15:10 2021.

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.