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

Function of the card:
Ctrl-driver,relay thyratron v.m.
CTRL-Driver,Relay Thyratron V.M.

Triple 2 Input NAND SCR Relay Driver

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

Part number: 371684

PCB number: 492905

Used in: IBM 1620


DP: Driver, Power. A power driver used to drive Into multiple bases.


A I1
B I1
C O1
D I2
E I2
F I3
G O3
H O2
M -12V
N +12VM
P I3
References: Coslet data
IBM 1620 Instructional System Diagrams, p486

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, 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.