Function of the card:
SDTRL - inverter, 2 way, unloaded collectors
SDTRL-inverter, 2 way, unloaded collectors
SDTRL-Inverter, 2 Way, Unloaded Collectors
SDTRL-inv 2 way unloaded collectors
Listed in 1401 SMS card usage
Quad 2 Input Open Collector NAND
Part number: 370084
PCB number: 492867
Used in: IBM 1620, IBM 1410, IBM 1414 I/O Synchronizer, IBM 1311 Disk, IBM 729V, 1622
Symbol:E, A, O
Pinout:
![]() |
A I2 B I1 C O3 D I1 E I3 F I3 G O1 H I2 J GND K O4 L PDR M -12V N +12VM P O2 Q I4 R I4 |
1410_SMS_VOL_1.pdf, p6
IBM 1311 ILD, p111
IBM 1620 Instructional System Diagrams, p479
IBM 1620 FE Catalog
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.