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# ACER, INC.
V55LA-2
Device Type Mainboard
Processor CX 6X86/CX 6X86L/CX 6X86MX/AM K5/AM
K6/Pentium/Pentium MMX
Processor Speed 75/90/100/120/133/150/166/180/200/233MHz
Chip Set Unidentified
Video Chip Set Unidentified
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video 2MB
Memory
Cache 256/512/1024KB
BIOS Acer
Dimensions 254mm x 218mm
I/O Options Floppy drive interface, green PC connector,
IDE interfaces (2), parallel port, PS/2 mouse
port, serial ports (2), VGA port, riser slot,
USB connector, line in, wavetable connector,
audio in – CD-ROM
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+---------------+-----------|
| Ethernet/multimedia | CN1 | CPU fan power | CN18 |
| connector | | | |
|---------------------+----------+---------------+-----------|
| Audio in – CD-ROM | CN2 | Front panel | CN19 |
| | | connector | |
|---------------------+----------+---------------+-----------|
| USB connector | CN5 | VGA port | CN21 |
|---------------------+----------+---------------+-----------|
| Wavetable connector | CN6 | Modem | CN22 |
| | | connector | |
|---------------------+----------+---------------+-----------|
| PS/2 mouse port | CN8 | ATI media | CN23 |
| | | connector | |
|---------------------+----------+---------------+-----------|
| Audio connector | CN9 | Line in | CN31 |
|---------------------+----------+---------------+-----------|
| Floppy drive | CN10 | Green PC | JP15 |
| interface | | connector | |
|---------------------+----------+---------------+-----------|
| IDE interface 2 | CN11 | External | JP30 |
| | | battery | |
|---------------------+----------+---------------+-----------|
| IDE interface 1 | CN12 | IDE interface | JP48/pins |
| | | LED | 1/3/5 |
|---------------------+----------+---------------+-----------|
| Serial port 1 | CN13 | Power LED | JP48/pins |
| | | | 2/4/6 |
|---------------------+----------+---------------+-----------|
| Serial port 2 | CN14 | Power on | JP50 |
| | | connector | |
|---------------------+----------+---------------+-----------|
| Parallel port | CN17 | Riser slot | SL1 |
|------------------------------------------------------------|
| Note: The location of CN1 is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | CN30 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | BIOS type select Acer | JP1 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | BIOS type select OEM | JP1 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | LED select IDE LED only | JP2 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | LED select IDE & floppy | JP2 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CN19/pins 19 & 20 supports | JP11 | Pins 1 & 2 |
| | green PC | | closed |
|---+---------------------------------+-------+--------------|
| | UPS enabled | JP16 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | UPS disabled | JP16 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP42 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | On board sound enabled | SW2/5 | Off |
|---+---------------------------------+-------+--------------|
| | On board sound disabled | SW2/5 | On |
|---+---------------------------------+-------+--------------|
| | Password disabled | SW2/6 | On |
|---+---------------------------------+-------+--------------|
| | Password enabled | SW2/6 | 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 |
|------------------+--------------------+--------------------|
| 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 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 256KB | (2) 32K x 32 | Unidentified |
|------------------+--------------------+--------------------|
| 512KB | (2) 64K x 32 | Unidentified |
|------------------+--------------------+--------------------|
| 1MB | (2) 128K x 32 | Unidentified |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 |
|------------------+--------------------+--------------------|
| 256KB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 512KB | Pins 1 & 2 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 1MB | 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 (CX 6X86) |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier|SW2/1 |SW2/2 |SW2/3 |SW2/4 |
|---------+-----------+----------+------+------+------+------|
| 120MHz | 50MHz | 2x | On | On | On | Off |
|---------+-----------+----------+------+------+------+------|
| 150MHz | 60MHz | 2x | On | Off | On | Off |
|---------+-----------+----------+------+------+------+------|
| 166MHz | 66MHz | 2x | Off | On | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86L) |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier|SW2/1 |SW2/2 |SW2/3 |SW2/4 |
|---------+-----------+----------+------+------+------+------|
| 120MHz | 50MHz | 2x | On | On | On | Off |
|---------+-----------+----------+------+------+------+------|
| 150MHz | 60MHz | 2x | On | Off | On | Off |
|---------+-----------+----------+------+------+------+------|
| 166MHz | 66MHz | 2x | Off | On | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86MX) |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier|SW2/1 |SW2/2 |SW2/3 |SW2/4 |
|---------+-----------+----------+------+------+------+------|
| 166MHz | 66MHz | 2.5x | Off | On | On | On |
|---------+-----------+----------+------+------+------+------|
| 180MHz | 60MHz | 3x | On | Off | Off | On |
|---------+-----------+----------+------+------+------+------|
| 200MHz | 66MHz | 3x | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K5) |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier|SW2/1 |SW2/2 |SW2/3 |SW2/4 |
|---------+-----------+----------+------+------+------+------|
| 75MHz | 50MHz | 1.5x | On | On | Off | Off |
|---------+-----------+----------+------+------+------+------|
| 90MHz | 60MHz | 1.5x | On | Off | Off | Off |
|---------+-----------+----------+------+------+------+------|
| 100MHz | 66MHz | 1.5x | Off | On | Off | Off |
|---------+-----------+----------+------+------+------+------|
| 120MHz | 60MHz | 2x | On | Off | On | Off |
|---------+-----------+----------+------+------+------+------|
| 133MHz | 66MHz | 2x | Off | On | On | Off |
|---------+-----------+----------+------+------+------+------|
| 166MHz | 66MHz | 2.5x | Off | On | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K6) |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier|SW2/1 |SW2/2 |SW2/3 |SW2/4 |
|---------+-----------+----------+------+------+------+------|
| 166MHz | 66MHz | 2.5x | Off | On | On | On |
|---------+-----------+----------+------+------+------+------|
| 200MHz | 66MHz | 3x | Off | On | Off | On |
|---------+-----------+----------+------+------+------+------|
| 233MHz | 66MHz | 3.5x | Off | On | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier|SW2/1 |SW2/2 |SW2/3 |SW2/4 |
|---------+-----------+----------+------+------+------+------|
| 75MHz | 50MHz | 1.5x | On | On | Off | Off |
|---------+-----------+----------+------+------+------+------|
| 90MHz | 60MHz | 1.5x | On | Off | Off | Off |
|---------+-----------+----------+------+------+------+------|
| 100MHz | 66MHz | 1.5x | Off | On | Off | Off |
|---------+-----------+----------+------+------+------+------|
| 120MHz | 60MHz | 2x | On | Off | On | Off |
|---------+-----------+----------+------+------+------+------|
| 133MHz | 66MHz | 2x | Off | On | On | Off |
|---------+-----------+----------+------+------+------+------|
| 150MHz | 60MHz | 2.5x | On | Off | On | On |
|---------+-----------+----------+------+------+------+------|
| 166MHz | 66MHz | 2.5x | Off | On | On | On |
|---------+-----------+----------+------+------+------+------|
| 200MHz | 66MHz | 3x | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL MMX) |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier|SW2/1 |SW2/2 |SW2/3 |SW2/4 |
|---------+-----------+----------+------+------+------+------|
| 150MHz | 60MHz | 2.5x | On | Off | On | On |
|---------+-----------+----------+------+------+------+------|
| 166MHz | 66MHz | 2.5x | Off | On | On | On |
|---------+-----------+----------+------+------+------+------|
| 200MHz | 66MHz | 3x | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP7 |
|-------------------------------+----------------------------|
| Single voltage | Closed |
|-------------------------------+----------------------------|
| Dual voltage | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | V core | JP43 | JP44 |
|----------+---------+-------------------+-------------------|
| 3.3v | 2.8v | Pins 2 & 3 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| 3.3v | 3.2v | Pins 2 & 3 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 3.5v | 2.8v | Pins 1 & 2 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| 3.5v | 3.2v | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+