There are 3 Standard Modular System (SMS) cards. They consist of transistors, transformers, capacitors, resistors and diodes. The card is pre-scored with 23 horizontal lines. There are also patterns of punched holes in the card for components. Many components are inserted vertically in lightweight copper component holders which also serves as a connector bus.
Date
1959 ca.
Manufacturer
International Business Machines (IBM)
Identifying Numbers
Model number
5300007
Stamped in black on lower left edge of component side
Other number
5300507
Stamped in solder on top left edge of circuit side
Other number
EC 249408
Stamped in black on lower left edge of component side