Function of the card:
CTDL-Integrator – U and – T
Listed in 1401 SMS card usage
Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.
Part number: 371635
Used in: IBM 1401
Cap code: TF (details)
Image courtesy of Randall Neff
Coslet data
SMS Cap Code Templates & Index
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.