Epson 386SX - Manual (Page 153)

2. Unpack the option card and adjust any switches or jumpers
on it if necessary. (Check the option card instructions to see
if this is necessary.) When you handle the card, be careful
not to touch any of the contacts on the circuit board,
especially the gold-edged connector pins. If you need to set
it down before you install it, place it gently on top of its
original packing material with the component side facing
up. Keep the packing materials in case you remove the card
later.
3. Grip the card firmly by the top corners and position it at the
top of the slot, as shown below. Make sure the connector
pins point down and the component side faces the power
supply inside the computer.
power supply
Installing Options 5-11