Function of the card:
CTDL-Inverter Latch NPN
Listed in 1401 SMS card usage
Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.
Part number: 370139
PCB number: 493331
Used in: IBM 1401
Cap code: None (details)
Image courtesy of Henk Stegeman
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.