This page describes the IBM SMS card "YYN", and is part of the SMS card database.

Function of the card:
SDTDL-sdtrl interface term gated
SDTDL/SDTRL - Standard Interface Terminator, Gated

Saturated Drift Transistor Diode Logic (SDTDL) is a form of Diode-transistor logic using faster drift-field transistors.

Saturated Drift Transistor Resistor Logic (SDTRL) is a form of resistor-transistor logic using faster drift-field transistors.

Part number: 372723

Customer Eng reference number: 822935

Used in: IBM 2821 Control Unit

Cap code: None (details)

IBM SMS card type YYN 372723 IBM SMS card type YYN 372723

References: National Museum of Computing.
IBM 2821 CCD, p110

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.