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

Function of the card:
Write driver gate & erase driver [ multi ]

Power Drivers (Two Different Types)

Part number: 372321

PCB number: 399649

Used in: IBM 1311 Disk

Symbol:G, D

G: Gate. Provides a switching pulse of voltage or current, positive or negative, that conditions some other circuit so that it may become either activated or deactivated by one or more other pulses.

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.


B I2
C I1
E I1
F O2
G O2
H O2
M -12V
N +12VM
P -36V
R O1
References: IBM 1311 ILD, p106
Coslet data

This page created by Ken Shirriff on Wed Sep 15 18:15:11 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on, 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.