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

Function of the card:
Ctrl mup-15

Dual RS Flip-Flop

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

A Multiple-Use Package (MUP) card has circuits jumpered together directly on the card to form more complex circuits.

Part number: 370353

PCB number: 484005

Used in: IBM 1620, 1626



A *Q1
B *S1
C Q2
D *Q2
E R1
F R1
G Q1
H *R1
K *R2
L *S2
M -12V
N +12VM
P R2
Q R2
R R2
References: IBM 1620 Instructional System Diagrams, p476
Coslet data
1626 Plotter Parts

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.