Function of the card:
SDTDL-Three 3-Way N And Logic Blocks without Loads
SDTDL three 3-way n and logic blocks without 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: 370219
PCB number: 484029
Used in: IBM 1410, IBM 1311 Disk, IBM 1401
Cap code: None (details)
Symbol: -A
-A: Negative AND. In-phase output is negative only when all inputs are negative. Out-of-phase output is positive for the above condition.
2_2 SMS Cards, pp74,75
1410_SMS_VOL_1.pdf, p36
Coslet data
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.