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# AMERICAN MEGATRENDS, INC.
MERLIN PCI
Processor Pentium Pro
Processor Speed 150/166/180/200MHz
Chip Set Natoma
Video Chip Set None
Maximum Onboard 512MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 256/512KB (located on Pentium Pro CPU)
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse interface, serial
ports (2), VRM connector, USB connectors (2),
VRM connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Parallel port | J1 | Serial port 2 | J12 |
|-------------------+----------+------------------+----------|
| IDE interface 1 | J2 | Serial port 1 | J13 |
|-------------------+----------+------------------+----------|
| USB connector 2 | J4 | Reset switch | J32 |
|-------------------+----------+------------------+----------|
| USB connector 1 | J5 | Turbo switch | J34 |
|-------------------+----------+------------------+----------|
| Floppy drive | J6 | Speaker | J35 |
| interface | | | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | J7 | IDE interface | J36 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Chassis fan power | J8 | Power LED & | J37 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Green PC | J10 | 32-bit PCI slots | PC1 - |
| connector | | | PC4 |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J11 | VRM connector | VRM |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | J24 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | J27 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | PS/2 mouse IRQ12 enabled | J31 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | PS/2 mouse IRQ12 disabled | J31 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | J33 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM 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) 2M x 36 | (2) 4M 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) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 16M x 36 | None |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 136MB | (2) 16M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 144MB | (2) 16M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 160MB | (2) 16M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 192MB | (2) 16M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 256MB | (2) 32M x 36 | None |
|------------------+--------------------+--------------------|
| 256MB | (2) 16M x 36 | (2) 16M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|--------------+------------------------+--------------------|
| 264MB | (2) 32M x 36 | (2) 1M x 36 |
|--------------+------------------------+--------------------|
| 272MB | (2) 32M x 36 | (2) 2M x 36 |
|--------------+------------------------+--------------------|
| 288MB | (2) 32M x 36 | (2) 4M x 36 |
|--------------+------------------------+--------------------|
| 320MB | (2) 32M x 36 | (2) 8M x 36 |
|--------------+------------------------+--------------------|
| 384MB | (2) 32M x 36 | (2) 16M x 36 |
|--------------+------------------------+--------------------|
| 512MB | (2) 32M x 36 | (2) 32M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. Board also accepts x 32 |
| SIMMs. Banks are interchangeable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: 256KB/512KB cache is located on the Pentium Pro CPU. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | J19 | J20 | J28 |
| speed | speed | | | | |
|----------+--------+------------+--------+--------+---------|
| 150MHz | 60MHz | 2.5x | Open | Closed | 3 & 4, |
| | | | | | 5 & 6, |
| | | | | | 7 & 8 |
|----------+--------+------------+--------+--------+---------|
| 166MHz | 66MHz | 2.5x | Closed | Open | 3 & 4, |
| | | | | | 5 & 6, |
| | | | | | 7 & 8 |
|----------+--------+------------+--------+--------+---------|
| 180MHz | 60MHz | 3x | Open | Closed | 1 & 2, |
| | | | | | 5 & 6, |
| | | | | | 7 & 8 |
|----------+--------+------------+--------+--------+---------|
| 200MHz | 66MHz | 3x | Closed | Open | 1 & 2, |
| | | | | | 5 & 6, |
| | | | | | 7 & 8 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | J16 |
|-------------------+----------------------------------------|
| | None | Open |
|---+---------------+----------------------------------------|
| | 2.1v | Pins 7 & 8 closed |
|---+---------------+----------------------------------------|
| | 2.2v | Pins 5 & 6 closed |
|---+---------------+----------------------------------------|
| | 2.3v | Pins 5 & 6, 7 & 8 closed |
|---+---------------+----------------------------------------|
| | 2.4v | Pins 3 & 4 closed |
|---+---------------+----------------------------------------|
| | 2.5v | Pins 3 & 4, 5 & 6 closed |
|---+---------------+----------------------------------------|
| | 2.6v | Pins 3 & 4, 5 & 6 closed |
|---+---------------+----------------------------------------|
| | 2.7v | Pins 3 & 4, 5 & 6, 7 & 8 closed |
|---+---------------+----------------------------------------|
| | 2.8v | Pins 1 & 2 closed |
|---+---------------+----------------------------------------|
| | 2.9v | Pins 1 & 2, 7 & 8 closed |
|---+---------------+----------------------------------------|
| | 3.0v | Pins 1 & 2, 5 & 6 closed |
|---+---------------+----------------------------------------|
| | 3.1v | Pins 1 & 2, 5 & 6, 7 & 8 closed |
|---+---------------+----------------------------------------|
| | 3.2v | Pins 1 & 2, 3 & 4 closed |
|---+---------------+----------------------------------------|
| » | 3.3v | Pins 1 & 2, 3 & 4, 7 & 8 closed |
|---+---------------+----------------------------------------|
| | 3.4v | Pins 1 & 2, 3 & 4, 5 & 6 closed |
|---+---------------+----------------------------------------|
| | 3.5v | Pins 1 & 2, 3 & 4, 5 & 6, 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOLTAGE SELECTION |
|------------------------------------------------------------|
| Setting | J3 | J22 |
|-----------------+-----------------------+------------------|
| From regulator | Open | Pins 1 & 2, 3 & |
| | | 4, 5 & 6 closed |
|-----------------+-----------------------+------------------|
| From 3.3v power | Pins 1 & 2, 3 & 4, 5 | Open |
| supply | & 6 closed | |
+------------------------------------------------------------+