Function of the card:
SDTDL single shot hammer dr.
Exists in SLT version.
Saturated Drift Transistor Diode Logic (SDTDL) is a form of Diode-transistor logic using faster drift-field transistors.
Part number: 373354
SLT modules: 2399113, HD
Customer Eng reference number: 734404
PCB number: 375679 , hole pattern: 490322
Used in: IBM 2821 Control Unit
Cap code: None (details)
Image courtesy of Henk Stegeman
Image courtesy of Richard Stuve
National Museum of Computing.
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.