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# AMERICAN MEGATRENDS, INC.
MEGARUM 758
Processor Pentium II
Processor Speed 120/133/150/166/180/200/210/233/240/266MHz
Chip Set Unidentified
Video Chip Set ATI
Maximum Onboard 1GB (EDO supported)
Memory
Maximum Video 2MB
Memory
Cache 256/512KB (located on Pentium II CPU)
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit PCI slots (6), floppy drive interface,
green PC connector, IDE interfaces (2), SCSI
interfaces (2), Wide SCSI interfaces (2),
parallel port, PS/2 mouse interface, serial
ports (2), VGA interface, VRM connectors (2),
USB connectors (2), CPU Slot 1s (2)
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J1 | Turbo LED | J33 |
| interface | | | |
|-------------------+----------+------------------+----------|
| CPU fan power 1 | J2 | SCSI interface 1 | J36 |
|-------------------+----------+------------------+----------|
| Parallel port | J3 | SCSI interface 2 | J37 |
|-------------------+----------+------------------+----------|
| Floppy drive | J4 | IDE interface | J38 |
| interface | | LED | |
|-------------------+----------+------------------+----------|
| CPU fan power 2 | J7 | SCSI interface | J40 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Serial port 2 | J8 | Power LED & | J41 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Serial port 1 | J9 | Wide SCSI | J44 |
| | | interface 1 | |
|-------------------+----------+------------------+----------|
| IDE interface | J10 | Wide SCSI | J45 |
| | | interface 2 | |
|-------------------+----------+------------------+----------|
| IDE interface | J11 | Speaker | J46 |
|-------------------+----------+------------------+----------|
| VGA interface | J16 | System override | J47 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Green PC | J18 | 32-bit PCI slots | PC1 - |
| connector | | | PC6 |
|-------------------+----------+------------------+----------|
| USB connector 1 | J19 | CPU Slot 1 | SL1 |
|-------------------+----------+------------------+----------|
| USB connector 2 | J20 | CPU Slot 2 | SL2 |
|-------------------+----------+------------------+----------|
| Chassis fan power | J23 | VRM connector 1 | VRM1 |
|-------------------+----------+------------------+----------|
| Reset switch | J28 | VRM connector 2 | VRM2 |
|-------------------+----------+------------------+----------|
| Chassis intrusion | J29 | | |
| connector | | | |
|------------------------------------------------------------|
| Note: The location of J18 is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | C1 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | C2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | C3 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | PCI IRQ disabled for onboard | J13 | Closed |
| | PCI VGA | | |
|---+---------------------------------+-------+--------------|
| | PCI IRQ enabled for onboard PCI | J13 | Open |
| | VGA | | |
|---+---------------------------------+-------+--------------|
| » | On board video enabled | J14 | Open |
|---+---------------------------------+-------+--------------|
| | On board video disabled | J14 | Closed |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | J35 | Open |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | J35 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 8MB | (2) 1M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 2M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 24MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x | (2) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 32MB | (2) 4M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 48MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x | (2) 2M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 | None | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|---------+-------------+------------+-----------+-----------|
| 64MB | (2) 8M x 36 | None | None | None |
|---------+-------------+------------+-----------+-----------|
| 96MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | None |
| | | 36 | 36 | |
|---------+-------------+------------+-----------+-----------|
| 128MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | (2) 4M x |
| | | 36 | 36 | 36 |
|---------+-------------+------------+-----------+-----------|
| 128MB | (2) 8M x 36 | (2) 8M x | None | None |
| | | 36 | | |
|---------+-------------+------------+-----------+-----------|
| 128MB | (2) 16M x | None | None | None |
| | 36 | | | |
|---------+-------------+------------+-----------+-----------|
| 192MB | (2) 8M x 36 | (2) 8M x | (2) 8M x | None |
| | | 36 | 36 | |
|---------+-------------+------------+-----------+-----------|
| 256MB | (2) 8M x 36 | (2) 8M x | (2) 8M x | (2) 8M x |
| | | 36 | 36 | 36 |
|---------+-------------+------------+-----------+-----------|
| 256MB | (2) 16M x | (2) 16M x | None | None |
| | 36 | 36 | | |
|---------+-------------+------------+-----------+-----------|
| 256MB | (2) 32M x | None | None | None |
| | 36 | | | |
|---------+-------------+------------+-----------+-----------|
| 384MB | (2) 16M x | (2) 16M x | (2) 16M x | None |
| | 36 | 36 | 36 | |
|---------+-------------+------------+-----------+-----------|
| 512MB | (2) 16M x | (2) 16M x | (2) 16M x | (2) 16M x |
| | 36 | 36 | 36 | 36 |
|---------+-------------+------------+-----------+-----------|
| 512MB | (2) 32M x | (2) 32M x | None | None |
| | 36 | 36 | | |
|---------+-------------+------------+-----------+-----------|
| 768MB | (2) 32M x | (2) 32M x | (2) 32M x | None |
| | 36 | 36 | 36 | |
|---------+-------------+------------+-----------+-----------|
| 1GB | (2) 32M x | (2) 32M x | (2) 32M x | (2) 32M x |
| | 36 | 36 | 36 | 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. Do not use 16M x 36 SIMMs |
| that have more than 36 chips per SIMM. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: 256KB/512KB cache is located on the Pentium II CPU. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | J21 | J24 |
|---------+---------+----------------------------------------|
| 120MHz | Open | Pins 1 & 2, 3 & 4, 5 & 6, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 133MHz | Closed | Pins 1 & 2, 3 & 4, 5 & 6, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 150MHz | Open | Pins 3 & 4, 5 & 6, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 166MHz | Closed | Pins 3 & 4, 5 & 6, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 180MHz | Open | Pins 1 & 2, 5 & 6, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 200MHz | Closed | Pins 1 & 2, 5 & 6, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 210MHz | Open | Pins 5 & 6, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 233MHz | Closed | Pins 5 & 6, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 240MHz | Open | Pins 1 & 2, 3 & 4, 7 & 8 closed |
|---------+---------+----------------------------------------|
| 266MHz | Closed | Pins 1 & 2, 3 & 4, 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | J5 | J15 |
|---------------+----------------------+---------------------|
| | 1.8v | 1 & 2, 3 & 4, 7 & 8 | 1 & 2, 3 & 4, 7 & 8 |
|-----+---------+----------------------+---------------------|
| | 1.85v | 1 & 2, 3 & 4, 7 & 8, | 1 & 2, 3 & 4, 7 & |
| | | 9 & 10 | 8, 9 & 10 |
|-----+---------+----------------------+---------------------|
| | 1.9v | 1 & 2, 3 & 4, 5 & 6 | 1 & 2, 3 & 4, 5 & 6 |
|-----+---------+----------------------+---------------------|
| | 1.95v | 1 & 2, 3 & 4, 5 & 6, | 1 & 2, 3 & 4, 5 & |
| | | 9 & 10 | 6, 9 & 10 |
|-----+---------+----------------------+---------------------|
| | 2.0v | 1 & 2, 3 & 4, 5 & 6, | 1 & 2, 3 & 4, 5 & |
| | | 7 & 8 | 6, 7 & 8 |
|-----+---------+----------------------+---------------------|
| | 2.05v | 1 & 2, 3 & 4, 5 & 6, | 1 & 2, 3 & 4, 5 & |
| | | 7 & 8, 9 & 10 | 6, 7 & 8, 9 & 10 |
|-----+---------+----------------------+---------------------|
| | 2.1v | 9 & 10 | 9 & 10 |
|-----+---------+----------------------+---------------------|
| | 2.2v | 7 & 8 | 7 & 8 |
|-----+---------+----------------------+---------------------|
| | 2.3v | 7 & 8, 9 & 10 | 7 & 8, 9 & 10 |
|-----+---------+----------------------+---------------------|
| | 2.4v | 5 & 6 | 5 & 6 |
|-----+---------+----------------------+---------------------|
| | 2.5v | 5 & 6, 9 & 10 | 5 & 6, 9 & 10 |
|-----+---------+----------------------+---------------------|
| | 2.6v | 5 & 6, 7 & 8 | 5 & 6, 7 & 8 |
|-----+---------+----------------------+---------------------|
| | 2.7v | 5 & 6, 7 & 8, 9 & 10 | 5 & 6, 7 & 8, 9 & |
| | | | 10 |
|-----+---------+----------------------+---------------------|
| | 2.8v | 3 & 4 | 3 & 4 |
|-----+---------+----------------------+---------------------|
| | 2.9v | 3 & 4, 9 & 10 | 3 & 4, 9 & 10 |
|-----+---------+----------------------+---------------------|
| | 3.0v | 3 & 4, 7 & 8 | 3 & 4, 7 & 8 |
|-----+---------+----------------------+---------------------|
| | 3.1v | 3 & 4, 7 & 8, 9 & 10 | 3 & 4, 7 & 8, 9 & |
| | | | 10 |
|-----+---------+----------------------+---------------------|
| | 3.2v | 3 & 4, 5 & 6 | 3 & 4, 5 & 6 |
|-----+---------+----------------------+---------------------|
| » | 3.3v | 3 & 4, 5 & 6, 9 & 10 | 3 & 4, 5 & 6, 9 & |
| | | | 10 |
|-----+---------+----------------------+---------------------|
| | 3.4v | 3 & 4, 5 & 6, 7 & 8 | 3 & 4, 5 & 6, 7 & 8 |
|-----+---------+----------------------+---------------------|
| | 3.5v | 3 & 4, 5 & 6, 7 & 8, | 3 & 4, 5 & 6, 7 & |
| | | 9 & 10 | 8, 9 & 10 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. J5 |
| controls Slot 1 & J15 controls Slot 2. |
+------------------------------------------------------------+