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

Function of the card:
CTRL-Emitter Follower PNP

Quad Emitter Follower

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

Part number:371032

PCB number:491155

Used in:IBM 1620,IBM 1414 I/O Synchronizer,IBM 1311 Disk,IBM 729II/V,IBM 1410

Symbol:DE

DE: Driver Emitter Follower. A driver, operating on the emitter follower principle, used for power amplification, impedance matching, and isolation without inversion. Often used as a logical element.

Transistor type:025/033

References:
IBM Standard Modular System, Component Circuits, p212,213.
1410_SMS_VOL_1.pdf/1410_SMS_VOL_2.pdf, p2056.
1414 SMS Cards, p20.
IBM 1311 ILD, p110.

Pinout:

A PU1
B I1
C I2
D PDR
E O4
F I3
G O1E
H O3E
J GND
K PU2
L I4
M -12V
N
P O2E
Q +12V
R PU3

This page created by Ken Shirriff, 2015.

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. Images courtesy of Randall Neff. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.

Creation time: Tue Mar 03 23:40:33 2015.