Function of the card:
Ctdl single shot "t" input
CTDL-Single Shot âTâ Input
CTDL Single Shot Trigger (T Input)
Listed in 1401 SMS card usage
Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.
Trigger is IBM's term for a flip flop or latch.
Part number: 371591
Used in: IBM 1410, IBM 1401, IBM 7070
Cap code: None (details)
Symbol: SS
SS: Single Shot. Provides a monostable output which can be pulsed into its quasi-stable state for a predetermined duration. with each input triggering pulse or triggering voltage change. Once triggered, the output pulse duration becomes independent of input time duration or amplitude.
Image courtesy of Henk Stegeman
IBM Standard Modular System, Component Circuits, p177
1410_SMS_VOL_2.pdf, p92
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.