IBM 3270 Hardware User's Manual page 76

3. Carefully remove the option from its bag.
Be sure to handle circuit boards by the edges
only and do not touch the component pins or
solder joints. Handle memory modules by
their narrow end and not by their pins.
4.
Hold the card by its top edge or corner when
you insert the card into the system unit.
Chapter 2. Setting Up and Checking Your 3270 PC 2-59