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

Function of the card:
CTRL-Inverter "N" 2 Way Extender
Ctrl-inverter 4 2 way
Crtl - inverter "n" 2 way
Ctrl - inverter n 2 way
Ctrl-inverter "n" 2 way

Quad 2 Input Open Collector NAND

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

Part number:371661

PCB number:492867

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

Symbol:E, A, O

E: Extender. Provides additional inputs to logical blocks and triggers. Adds to drivers the ability to drive more loads.

Transistor type:033

References:
1410_SMS_VOL_1.pdf/1410_SMS_VOL_2.pdf, p2104.
1414 SMS Cards, p73.
IBM 1311 ILD, p134.
IBM 1620 Instructional System Diagrams, p485.

Pinout:

A I2
B I1
C O3
D I1
E I3
F I3
G O1
H I2
J GND
K O4
L O2R
M -12V
N +12VM
P O2C
Q I4
R I4

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 23:40:34 2015.