Function of the card:
SDTDL - trigger
Saturated Drift Transistor Diode Logic (SDTDL) is a form of Diode-transistor logic using faster drift-field transistors.
Trigger is IBM's term for a flip flop or latch.
Part number: 370222
PCB number: 484033
Used in: IBM 1410, IBM 1311 Disk
Cap code: None (details)
Symbol: T
T: Trigger. A conditioned bi-stable device whose steady-state outputs change from one stable state to the other with two separate triggering levels, pulses, or voltage changes. The set input turns the trigger on if the reset input Is not on, and vice versa.
1410_SMS_VOL_1.pdf, p39
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.