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# ACER, INC.
V55-2
Device Type Mainboard
Processor Pentium/Pentium MMX/ CX 6x86/AM K5/IBM 6x86
Processor Speed 75/90/100/120/133/150/166/200 MHz
Chip Set Unidentified
Maximum Onboard 128MB (EDO & SDRAM supported)
Memory
Cache 256/512KB
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options (CPU) 32-bit ISA slots (3), 32-bit PCI slots (4),
bus mouse port, PS/2 keyboard port, serial
ports (2), parallel port
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+-----------+----------------+-------------|
| Standby power | CN1 | Speaker | CN16/pins 7 |
| connector | | | - 10 |
|-----------------+-----------+----------------+-------------|
| Serial port 2 | CN2 | Turbo LED | CN16/pins |
| | | | 12 & 13 |
|-----------------+-----------+----------------+-------------|
| Serial port 1 | CN3 | Reset | CN16/pins |
| | | | 19 & 20 |
|-----------------+-----------+----------------+-------------|
| Parallel port | CN4 | External | CN17 |
| | | suspend switch | |
|-----------------+-----------+----------------+-------------|
| Floppy drive | CN5 | Software | CN18 |
| interface | | shutdown | |
| | | switch | |
|-----------------+-----------+----------------+-------------|
| IDE interface 2 | CN6 | IrDA connector | CN19 |
|-----------------+-----------+----------------+-------------|
| IDE interface 1 | CN9 | IDE interface | CN20 |
| | | LED | |
|-----------------+-----------+----------------+-------------|
| CPU power | CN13 | PS/2 mouse | CN21 |
| shorting block | | port | |
|-----------------+-----------+----------------+-------------|
| CPU fan | CN14 | 32-bit PCI | PC1-PC4 |
| connector | | expansion | |
| | | slots | |
|-----------------+-----------+----------------+-------------|
| Keylock | CN16/pins | Cache slot | SL1 |
| | 1 & 2 | | |
|-----------------+-----------+----------------+-------------|
| Power LED | CN16/pins | | |
| | 3 - 5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|--------------------------------+-------+-------------------|
| » | ROM type select Flash ROM | JP4 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| | ROM type select EPROM | JP4 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| » | CPU core voltage select | JP6 | Pins 2 & 3 closed |
| | 2.8v | | |
|---+----------------------------+-------+-------------------|
| | CPU core voltage select | JP6 | Pins 1 & 2 closed |
| | 3.2v | | |
|---+----------------------------+-------+-------------------|
| » | CPU I/O voltage select | JP7 | Pins 2 & 3 closed |
| | 3.3v | | |
|---+----------------------------+-------+-------------------|
| | CPU I/O voltage select | JP7 | Pins 1 & 2 closed |
| | 3.5v | | |
|---+----------------------------+-------+-------------------|
| » | Factory configured - do | JP10 | Pins 2 & 3 closed |
| | not alter | | |
|---+----------------------------+-------+-------------------|
| | CMOS discharge normal | JP11 | Open |
|---+----------------------------+-------+-------------------|
| | CMOS discharge clear | JP11 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ROM BRAND SELECTION |
|------------------------------------------------------------|
| Brand | JP5 |
|----------------------------+-------------------------------|
| » | 29EE010 | Pins 2 & 3 closed |
|---+------------------------+-------------------------------|
| | NC | Pins 1 & 2 closed |
|---+------------------------+-------------------------------|
| | 29F001 | Pins 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 32 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 32 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 32 | (2) 1M x 32 |
|------------------+--------------------+--------------------|
| 24MB | (2) 2M x 32 | (2) 1M x 32 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 32 | None |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 32 | (2) 2M x 32 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 32 | (2) 1M x 32 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 32 | (2) 2M x 32 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 32 | None |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 32 | (2) 4M x 32 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 32 | (2) 1M x 32 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8M x 32 | (2) 2M x 32 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 32 | (2) 4M x 32 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 32 | (2) 8M x 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | SL1 | Tag | Bank 0 |
|------------+---------------+---------------+---------------|
| 256KB | (2) 32K x 32 | (8) 32K x 32 | (2) 32K x 32 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 32K x 32 | (8) 32K x 32 | (4) 32K x 32 |
|------------+---------------+---------------+---------------|
| 512KB | (2) 64K x 32 | (8) 32K x 32 | (2) 64K x 32 |
|------------------------------------------------------------|
| Note: The location of Tag SRAM is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 |
|-----------------+--------------------+---------------------|
| » | 256KB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|---+-------------+--------------------+---------------------|
| | 512KB | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock | Clock | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
| | Speed | Ratio | | | | |
|--------+-----------+-------+-------+-------+-------+-------|
| 75MHz | 50MHz | 1.5x | Off | Off | On | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 90MHz | 60MHz | 1.5x | Off | Off | Off | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 100MHz | 66MHz | 1.5x | Off | Off | On | Off |
|--------+-----------+-------+-------+-------+-------+-------|
| 120MHz | 60MHz | 2x | Off | On | Off | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 133MHz | 66MHz | 2x | Off | On | On | Off |
|--------+-----------+-------+-------+-------+-------+-------|
| 150MHz | 60MHz | 2.5x | On | On | Off | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 166MHz | 66MHz | 2.5x | On | On | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY SELECTION (INTEL MMX) |
|------------------------------------------------------------|
| CPU | Clock | Clock | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
| | Speed | Ratio | | | | |
|--------+-----------+-------+-------+-------+-------+-------|
| 166MHz | 66MHz | 2.5x | On | On | On | Off |
|--------+-----------+-------+-------+-------+-------+-------|
| 180MHz | 60MHz | 3x | On | Off | Off | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 200MHz | 66MHz | 3x | On | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY SELECTION (AM K5) |
|------------------------------------------------------------|
| CPU | Clock | Clock | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
| | Speed | Ratio | | | | |
|--------+-----------+-------+-------+-------+-------+-------|
| 75MHz | 50MHz | 1.5x | Off | Off | On | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 90MHz | 60MHz | 1.5x | Off | Off | Off | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 100MHz | 66MHz | 1.5x | Off | Off | On | Off |
|--------+-----------+-------+-------+-------+-------+-------|
| 120MHz | 60MHz | 2x | Off | On | Off | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 133MHz | 66MHz | 2x | Off | On | On | Off |
|--------+-----------+-------+-------+-------+-------+-------|
| 150MHz | 60MHz | 2.5x | On | On | Off | On |
|--------+-----------+-------+-------+-------+-------+-------|
| 166MHz | 66MHz | 2.5x | On | On | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY SELECTION (CX 6X86) |
|------------------------------------------------------------|
| CPU | Host Bus | Clock | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
| | | Ratio | | | | |
|--------+----------+--------+-------+-------+-------+-------|
| 120MHz | 50MHz | 2x | Off | On | On | On |
|--------+----------+--------+-------+-------+-------+-------|
| 150MHz | 60MHz | 2x | Off | On | Off | On |
|--------+----------+--------+-------+-------+-------+-------|
| 166MHz | 66MHz | 2x | Off | On | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU FREQUENCY SELECTION (IBM 6X86) |
|------------------------------------------------------------|
| CPU | Host Bus | Clock | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
| | | Ratio | | | | |
|--------+----------+--------+-------+-------+-------+-------|
| 120MHz | 50MHz | 2x | Off | On | On | On |
|--------+----------+--------+-------+-------+-------+-------|
| 150MHz | 60MHz | 2x | Off | On | Off | On |
|--------+----------+--------+-------+-------+-------+-------|
| 166MHz | 66MHz | 2x | Off | On | On | Off |
+------------------------------------------------------------+