Acer 486 User Manual page 6

The following tables list the jumper settings and their correponding
functions.
Table 1-1 System Board Jumpers
Jumper Setting
JP2 1-2
2-3
JP14 Closed
Open
JP16 Open
Closed
JP21 Closed
Open
JP28 1-2
2-3
JP37-38 1-2
2-3
Table 1-2 CPU Clock Selection
JP10 JP17
2-3 2-3
2-3 2-3
1-6
Function
Enable password check
Bypass password
Enable onboard VGA
Disable onboard VGA
Enable onboard local bus IDE
Disable onboard local bus IDE
Enable onboard super I/O chip
Disable onboard syper I/O chip
Enable onboard memory
Disable onboard memory
Enable Reset button
Enable Suspend/Resume button
JP19 CN14
2-3 3-7 33 MHz (for SX/33,
DX2/66 or DX4/100)
2-3 4-8 25 MHz (for SX2/50
or DX2/50)
CPU Clock
User's Guide