Function of the card:
Alloy – Driver, Prolay One Read Gate
Listed in 1401 SMS card usage
Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.
Part number: 371433
Used in: IBM 7090, IBM 729II/V
Cap code: VZ (details)
Image courtesy of Christoph Methfessel
Image courtesy of Henk Stegeman
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.