 Acer File Extensions |
Acer V55-2 Motherboard
Jumper and Connector Layout
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 MHz | 66 | On Off | On Off | 3 |
| 180 MHz | 60 | On Off | Off On | 3 |
| 166 MHz | 66 | On On | On Off | 5/2 |
| 150 MHz | 60 | On On | Off On | 5/2 |
| 133 MHz | 66 | Off On | On Off | 2 |
| 120 MHz | 60 | Off On | Off On | 2 |
| 100 MHz | 66 | Off Off | On Off | 3/2 |
| 90 MHz | 60 | Off Off | Off On | 3/2 |
| 75 MHz | 50 | Off Off | On On | 3/2 |
| Cyrix M1/IBM 6x86 | ||||
| P166+ | 66 | Off On | On Off | 2 |
| P150+ | 60 | Off On | Off On | 2 |
| P120+ | 50 | Off On | On On | 2 |
Jumper Settings
| Jumper | Setting | Function |
|---|---|---|
| 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 | 2-3 | Reserved 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
| Connector | Function |
|---|---|
| CN1 | Standby power connector |
| CN2 | Serial port 2 connector |
| CN3 | Serial port 1 connector |
| CN4 | Parallel port connector |
| CN5 | Diskette drive connector |
| CN6 | IDE 2 connector |
| CN8 | Power connector |
| CN9 | IDE 1 connector |
| CN10 | PS/2 keyboard port |
| CN11 | PS/2 mouse port |
| CN13 | CPU power shorting block |
| CN14 | CPU fan connector |
| CN16 | Multifunction connector |
| CN17 | External suspend switch |
| CN18 | Software shutdown switch |
| CN19 | IrDA connector (optional) |
| CN20 | IDE 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 |
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Memory
Memory module : 72pin EDO SIMM 60/70ns Maximum : 128MB