Function of the card:
SDTRL-Trigger, Binary
SDTRL- trigger, binary
AC Coupled RS Flip-Flop
Trigger is IBM's term for a flip flop or latch.
Saturated Drift Transistor Resistor Logic (SDTRL) is a form of resistor-transistor logic using faster drift-field transistors.
Part number: 371867
PCB number: 492907
Used in: 1622, IBM 1620
Cap code: None (details)
Symbol: TB
TB: Trigger (Binary). A trigger whose steady state outputs change upon the transition of the input, i.e., usually going plus to minus, or sometimes going minus to plus.
Image courtesy of Eric Schlaepfer
Pinout:
 |
A RG1 B Q C *R D RP1 E RG2 F RP2 G RR1 H *S J GND K SG2 L SP2 M -12V N +12VM P *Q Q SP1 R SG1 |
IBM 1620 Instructional System Diagrams, p495
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.