Function of the card:
2-2 plus a, plus o. no load
2-2 way plus a plus o wo/load
Part number: 372241
Customer Eng reference number: 734323
PCB number: 484959 , hole pattern: 493457
Used in: IBM 1443 Printer, IBM 2821 Control Unit
Cap code: None (details)
Symbol: +O, +A
+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.
+A: Positive AND. in-phase output is positive only when all inputs are positive. Out-of-phase output is negative for the above condition.
IBM 1443 ALD, p85
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.