Function of the card:
CTDL- 3-Way “And” NPN
Three-Way +AND (2 loads)
Listed in 1401 SMS card usage
Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.
Part number: 371254
Cap code: WV (details, details)
Symbol: +A
+A: Positive AND. in-phase output is positive only when all inputs are positive. Out-of-phase output is negative for the above condition.
Image courtesy of Henk Stegeman
IBM Standard Modular System, Component Circuits, p46
Coslet data
SMS Cap Code Templates & Index
1401 Pocket Reference Manual
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.