Function of the card:
CTDL-One Way PNP 4 Loads Four on Card
T to U Converter (4 Loads)
Ctdl one way pnp all loads
Ctdl-one way pnp
Part number: 371271
Field replacement part number: 370981
Customer Eng reference number: 729848
PCB number: 491441
Image courtesy of Randall Neff
IBM Standard Modular System, Component Circuits, p54.
1_2 SMS Cards, p37,110.
1414 SMS Cards, p24,99.
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.