Function of the card:
Voltage Mode Indicator Driver
Alloy-Indicators, Lamp, VM
Listed in 1401 SMS card usage
Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.
Part number: 371048
Used in: 7030, IBM 1410, IBM 729V
Cap code: None (details)
Symbol: DI
DI: Driver, Indicator. Driver operating into an indicating device.
IBM Standard Modular System, Component Circuits, p219
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.