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# ACER, INC.
V55LA
Device Type Mainboard
Processor Pentium/CX 6X86/AM K5
Processor Speed 75/90/100/120/133/150/166/200MHz
Chip Set Unidentified
Video Chip Set Unidentified
Maximum Onboard 128MB (EDO & SDRAM supported)
Memory
Maximum Video 2MB
Memory
Cache 256/512KB
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options Bus mouse port, Ethernet 10BaseT connector,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse port, serial ports
(2), VGA port, riser slot, IR connector, line
in, wavetable connector, audio in - CD-ROM
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+-----------+-------------+-----------|
| Multimedia/ethernet | CN1 | Turbo LED | CN19/pins |
| connector | | | 12 & 13 |
|----------------------+-----------+-------------+-----------|
| Audio in - CD-ROM | CN2 | Turbo | CN19/pins |
| | | | 15 - 17 |
|----------------------+-----------+-------------+-----------|
| LAN connector | CN5 | Reset | CN19/pins |
| | | | 19 & 20 |
|----------------------+-----------+-------------+-----------|
| Wavetable | CN6 | Video port | CN21 |
|----------------------+-----------+-------------+-----------|
| PS/2 mouse port | CN8 | Fax/modem | CN22 |
| | | connector | |
|----------------------+-----------+-------------+-----------|
| Audio I/O board | CN9 | Reset | CN30 |
| connector | | switch | |
| | | connector | |
|----------------------+-----------+-------------+-----------|
| Floppy drive | CN10 | Line in | CN31 |
| interface | | | |
|----------------------+-----------+-------------+-----------|
| IDE interface 2 | CN11 | Power LED & | JP9 |
| | | hard disk | |
|----------------------+-----------+-------------+-----------|
| IDE interface 1 | CN12 | Disk LED | JP10 |
|----------------------+-----------+-------------+-----------|
| Serial port 1 | CN13 | SMM switch | JP11/pins |
| | | | 1 & 2 |
|----------------------+-----------+-------------+-----------|
| Serial port 2 | CN14 | Reset | JP11/pins |
| | | switch | 2 & 3 |
|----------------------+-----------+-------------+-----------|
| Parallel port | CN17 | Additional | JP11/pins |
| | | reset | 3 & 4 |
| | | switch | |
|----------------------+-----------+-------------+-----------|
| CPU fan connector | CN18 | Power | JP14 |
| | | switch | |
| | | connector | |
|----------------------+-----------+-------------+-----------|
| Power LED & keylock | CN19/pins | Standby | JP15 |
| | 1 - 5 | power | |
| | | connector | |
|----------------------+-----------+-------------+-----------|
| Speaker | CN19/pins | External | JP30 |
| | 7 - 10 | battery | |
| | | connector | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|--------------------------------+-------+-------------------|
| | BIOS type select Acer | JP1 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | BIOS type select OEM | JP1 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| | LED for IDE/FDD | JP2 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | LED for IDE only | JP2 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| | Allow boot block | JP5 | Pins 1 & 2 closed |
| | programming | | |
|---+----------------------------+-------+-------------------|
| | Normal flash BIOS | JP5 | Pins 2 & 3 closed |
| | operation | | |
|---+----------------------------+-------+-------------------|
| | Regulator 1 voltage | JP7 | Closed |
|---+----------------------------+-------+-------------------|
| | Regulator 2 voltages | JP7 | Open |
|---+----------------------------+-------+-------------------|
| | UPS enabled | JP16 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | UPS disabled | JP16 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| ยป | Factory configured - do | JP19 | Reserved |
| | not alter | | |
|---+----------------------------+-------+-------------------|
| | Intel or CX 6X86 "1+4" | JP42 | Pins 1 & 2 closed |
| | mode | | |
|---+----------------------------+-------+-------------------|
| | CX 6X86 linear burst mode | JP42 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| | Onboard sound chip | SW1/5 | On |
| | disabled | | |
|---+----------------------------+-------+-------------------|
| | Onboard sound chip enabled | SW1/5 | Off |
|---+----------------------------+-------+-------------------|
| | Password bypass | SW1/6 | On |
|---+----------------------------+-------+-------------------|
| | Password check | SW1/6 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|-----------------+-------------------+----------------------|
| 8MB | (2) 1M x 36 | None |
|-----------------+-------------------+----------------------|
| 16MB | (2) 2M x 36 | None |
|-----------------+-------------------+----------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|-----------------+-------------------+----------------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 |
|-----------------+-------------------+----------------------|
| 32MB | (2) 4M x 36 | None |
|-----------------+-------------------+----------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|-----------------+-------------------+----------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|-----------------+-------------------+----------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|-----------------+-------------------+----------------------|
| 64MB | (2) 8M x 36 | None |
|-----------------+-------------------+----------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|-----------------+-------------------+----------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|-----------------+-------------------+----------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|-----------------+-------------------+----------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|-----------------+-------------------+----------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Tag SRAM | Bank 0 | Bank 1 |
|------------+---------------+----------------+--------------|
| 256KB | (2) 32K x 32 | (2) 32K x 32 | None |
|------------+---------------+----------------+--------------|
| 512KB | (2) 32K x 32 | (2) 32K x 32 | (2) 32K x 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 |
|-----------------+---------------------+--------------------|
| 256KB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|-----------------+---------------------+--------------------|
| 512KB | Pins 1 & 2 closed | Pins 2 & 3 closed |
|-----------------+---------------------+--------------------|
| 1 MB | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|-----------------+---------------------+--------------------|
| 1MB | (2) 256K x 16 | None |
|-----------------+---------------------+--------------------|
| 2MB | (2) 256K x 16 | (2) 256K x 16 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| CPU speed | Clock speed | SW1/1 | SW1/2 |
|----------------+---------------+-------------+-------------|
| 75MHz | 50MHz | On | On |
|----------------+---------------+-------------+-------------|
| 90MHz | 60MHz | On | Off |
|----------------+---------------+-------------+-------------|
| 100MHz | 66MHz | Off | On |
|----------------+---------------+-------------+-------------|
| 120MHz | 60MHz | On | Off |
|----------------+---------------+-------------+-------------|
| 133MHz | 66MHz | Off | On |
|----------------+---------------+-------------+-------------|
| 150MHz | 60MHz | On | Off |
|----------------+---------------+-------------+-------------|
| 166MHz | 66MHz | Off | On |
|----------------+---------------+-------------+-------------|
| 200MHz | 66MHz | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY RATIO SELECTION (INTEL) |
|------------------------------------------------------------|
| Ratio | SW1/3 | SW1/4 |
|-------------------+--------------------+-------------------|
| 1.5x | Off | On |
|-------------------+--------------------+-------------------|
| 1.5x | Off | Off |
|-------------------+--------------------+-------------------|
| 2x | On | Off |
|-------------------+--------------------+-------------------|
| 2.5x | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY RATIO SELECTION (CX 6X86) |
|------------------------------------------------------------|
| Ratio | SW1/3 | SW1/4 |
|--------------------+-------------------+-------------------|
| 4x | Off | On |
|--------------------+-------------------+-------------------|
| 3x | Off | Off |
|--------------------+-------------------+-------------------|
| 2x | On | Off |
|--------------------+-------------------+-------------------|
| 1x | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY RATIO SELECTION (AM K5) |
|------------------------------------------------------------|
| K5 | SW1/3 | SW1/4 |
|--------------------+-------------------+-------------------|
| 1.5x | Off | Off |
|--------------------+-------------------+-------------------|
| 2x | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ROM TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP6 |
|------------------------------+-----------------------------|
| Flash ROM | Pins 1 & 2 closed |
|------------------------------+-----------------------------|
| EPROM | Pins 2 & 3 closed |
|------------------------------+-----------------------------|
| Block flash EEPROM | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU I/O VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP43 |
|------------------------------+-----------------------------|
| 3.5v | Pins 1 & 2 closed |
|------------------------------+-----------------------------|
| 3.3v | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CORE VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP44 |
|------------------------------+-----------------------------|
| 2.5v | Pins 1 & 2 closed |
|------------------------------+-----------------------------|
| 2.8v | Pins 2 & 3 closed |
+------------------------------------------------------------+