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

Function of the card:
CTRL-Emitter Follower PNP
Ctrl-emitter follower pnp

CE is listed in some sources with part number 371032, which corresponds to CEYB.
Listed in 1401 SMS card usage
Quad Emitter Follower

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

Part number: 371032

Used in: IBM 729II, 1622, IBM 1620

Cap code: None (details)

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.

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
References: IBM 1620 FE Catalog
IBM 1620 Instructional System Diagrams, p477
Coslet data

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.