Acer 486 User Manual page 13

1.7 Power Daughter Board
The power daughter board enables the system to support a 3.3V
microprocessor. Without this board, your system can only support a
5V CPU.
Follow these steps to install the power daughter board:
Before installing, you must check first the
voltage requirement of your upgrade CPU.
1. Locate the power daughter board connectors marked as JP44
and JP45 on the system board. See Figure 1-1.
2. If your system board comes with a 5V CPU, then you will find
JP45 closed. Remove the jumper cap of JP45 and insert the
board into the connectors.
System Board 1-13