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

Function of the card:
CTRL- Inverter, Power - PNP

Quad Inverter

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

Part number:371487

PCB number:492793

Used in:IBM 1620,IBM 729V

Symbol:I, A, O

I: Inverter. Changes a positive input to a negative output, or vice versa.

Transistor type:033

References:
IBM 1620 Instructional System Diagrams, p485.

Pinout:

A O4
B I3
C O3R
D O2
E O3C
F I4R
G I1C
H I4C
J GND
K I1R
L O1C
M -12V
N +12VM
P I2R
Q I2C
R O1R

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.