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

Function of the card:
CTRL-Drivers,VM,Light or Relay
Ctrl- drivers, vm, light or relay

Dual Lamp/Relay Driver

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

Part number: 371750

Used in: 1622, IBM 1620

Cap code: None (details)

Symbol: D

D: Driver. Isolates a signal from its generating source and uses it to drive one or more other circuits without affecting or overloading the generating circuits. Can be used to supply the required power directly or only to activate the circuit through which power is actually supplied.

Pinout:

A I1D
B O1L
C O2L
D I1
E I2
F O1C
G I2D
H O2C
J GND
K
L +12V
M -12V
N -12VM?
P
Q
R
References: IBM 1620 FE Catalog
IBM 1620 Instructional System Diagrams, p487
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.