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Acer V55-2 Motherboard

Jumper and Connector Layout

V55-2 Motherboard Diagram

Note - The blackened pin of a jumper represents pin 1.

CPU Switch Settings

CPU Freq.
(MHz)
Host Bus Freq.
(MHz)
Switch Settings
SW1 SW2
Switch Settings
SW3 SW4
Clock Ratio
Intel P54C/P55C, AMD K5
200 MHz66On OffOn Off3
180 MHz60On OffOff On3
166 MHz66On OnOn Off 5/2
150 MHz60On OnOff On 5/2
133 MHz66Off OnOn Off2
120 MHz60Off OnOff On2
100 MHz66Off OffOn Off3/2
90 MHz60Off OffOff On3/2
75 MHz50Off OffOn On3/2
Cyrix M1/IBM 6x86
P166+66Off OnOn Off2
P150+60Off OnOff On2
P120+50Off OnOn On2

Jumper Settings

JumperSettingFunction
ROM Type
JP4
1-2
2-3
EPROM
Flash ROM
ROM Brand
JP5
1-2
2-3
3-4
NC
29EE010
28F001
CPU Core Voltage
JP6
1-2
2-3
3.2V
2.8V (for Intel P55C CPU)
CPU I/O Voltage
JP7
1-2
2-3
3.5V
3.3V
L2 Cache Size
JP8, JP9
1-2
2-3
512 KB
256 KB
L2 Cache Mode
JP10
2-3Reserved Setting, Do not alter
CMOS Discharge
JP11
Open
Closed
Normal
Clear CMOS

Note that there is no physical jumper on the location of JP11. JP11 is represented by two solder pads on the system board. Short these pads for about 10 seconds to clear the CMOS.

Connector Functions

ConnectorFunction
CN1Standby power connector
CN2Serial port 2 connector
CN3Serial port 1 connector
CN4Parallel port connector
CN5Diskette drive connector
CN6IDE 2 connector
CN8Power connector
CN9IDE 1 connector
CN10PS/2 keyboard port
CN11PS/2 mouse port
CN13CPU power shorting block
CN14CPU fan connector
CN16Multifunction connector
CN17External suspend switch
CN18Software shutdown switch
CN19IrDA connector (optional)
CN20IDE LED connector

The multifunction connector CN16 accommodates the front panel connectors for speaker, LEDs, keylock, and reset. Figure 1-4 shows the CN16 pin assignments for each of the front panel connectors
 
Multi Function Connector

Memory

Memory module : 72pin EDO SIMM 60/70ns Maximum : 128MB