Function of the card:
CTDL-Two Way “And” PNP No Loads
Two-Way-AND (no loads)
Ctdl 2 way and pnp field replacement
Listed in 1401 SMS card usage
Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.
Part number: 371263
Field replacement part number: 370975
PCB number: 528991
Cap code: None (details)
Symbol: -A
-A: Negative AND. In-phase output is negative only when all inputs are negative. Out-of-phase output is positive for the above condition.
Image courtesy of Randall Neff
Image courtesy of Henk Stegeman
IBM Standard Modular System, Component Circuits, p42
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.