Function of the card:
Alloy-Resistor Card, 3 Watt [MARS Resistor Load Matrix]
Alloy-resistor card, 3 watt
Hex Pullup +12V 40.2ohm 3W
Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.
Part number: 370788
PCB number: 492345
Used in: IBM 1620
Cap code: None (details)
Symbol: R
R: Load. Provides proper terminating impedance or optimum coupling of one circuit to another at the correct operating voltage level.
Pinout:
 |
A spare B R1 C R2 D R3 E R4 F R5 G R6 H spare J GND K spare L spare M spare N spare P spare Q +12V R spare |
Coslet data
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.