Function of the card:
Two-Way+AND (no loads)
CTDL-Two Way “And” NPN No Loads
Ctdl 2 nay and npn 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: 371266
Field replacement part number: 370976
PCB number: 528993
Cap code: None (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 Christoph Methfessel
Image courtesy of Randall Neff
Image courtesy of Henk Stegeman
1_2 SMS Cards, pp30,31,32,86
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.