IBM 3270 Hardware User's Manual page 70

3. Carefully remove the adapter from its bag.
Be sure to handle circuit boards by the edges
only and do not touch the component pins or
solder joints.
4. Hold the card by its top edge or corners when
you insert it into the system unit or the
expansion unit.
5. Now, go to the Option Instruction booklet,
and follow the instructions there.
Chapter 2. Setting Up and Checking Your 3270 PC 2-53