Function of the card:
SDTDL two 5-way n and logic blocks without loads
SDTDL two 5-way n and logic blocks without. loads
Saturated Drift Transistor Diode Logic (SDTDL) is a form of Diode-transistor logic using faster drift-field transistors.
Part number: 370221
PCB number: 399589 , hole pattern: 399402
Used in: IBM 1410, IBM 1311 Disk
Cap code: None (details)
Symbol: +O
+O: Positive OR. In-phase output is positive if one or more input signals are positive. Out-of phase output is negative for the above condition.
1410_SMS_VOL_1.pdf, p38
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.