Function of the card:
SDTDL double level logic block #2a low speed, wo loads
SDTDL-Double Level Logic Block #2A Low Speed, wo Loads
Listed in 1401 SMS card usage
Saturated Drift Transistor Diode Logic (SDTDL) is a form of Diode-transistor logic using faster drift-field transistors.
Part number: 370358
PCB number: 484135
Cap code: None (details)
Image courtesy of Steven Dicker
2_2 SMS Cards, pp103,104
1410_SMS_VOL_1.pdf, p92
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.