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1-6
User’s Guide
1.2.2
Jumper Settings
Table 1-1 lists the system board jumpers with their corresponding
settings and functions.
Table 1-1
System Board Jumper Settings
Jumper
Setting
Function
BIOS Type
JP1
1-2
2-3
For models with Acer BIOS
For models with OEM BIOS
LED Function
JP2
1-2
2-3
LED for IDE and FDD
LED for IDE only
Second-level Cache
JP3, JP4
1-2, 1-2
1-2, 2-3
2-3, 2-3
256 KB
512 KB
1 MB
Regulator
JP7
Closed
Open
For single-voltage CPUs (P54C, K5, M1)
For dual-voltage CPUs (P55C, K6, M2)
SMM/Reset Switch
JP11
1-2
2-3
CN19 pins 19-20 support SMM switch
Reserved
Software Shutdown
JP16
1-2
2-3
UPS enabled
UPS disabled
CPU Voltage
JP43 (for I/O)
JP44 (for core)
1-2
2-3
1-2
2-3
3.5V
3.3V
3.2V
2.8V