Function of the card:
SDTDL-SDTRL- 6.67 KC Oscillator
SDTDL-sdtrl - 6.67 kc oscillator
Listed in 1401 SMS card usage
Part number: 370401
PCB number: 484149
2_2 SMS Cards, pp123,124
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.