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# AMERICAN MEGATRENDS, INC.
ATLAS PCI-III
Device Type Mainboard
Processor AM K5/AM K6/Pentium
Processor Speed 75/90/100/120/133/150/166/180/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 256MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 256/512KB
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)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| CPU fan power | J13 | IDE interface 1 | P5 |
|-------------------+----------+------------------+----------|
| Reset switch | J20 | Power connector | P6 |
|-------------------+----------+------------------+----------|
| IDE interface LED | J21 | Auxiliary power | P8 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Green PC | J22 | IDE interface 2 | P9 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Speaker | J23 | 32-bit PCI slots | PC1 – |
| | | | PC4 |
|-------------------+----------+------------------+----------|
| Power LED & | J24 | PS/2 mouse | PS2 |
| keylock | | interface | |
|-------------------+----------+------------------+----------|
| Serial port 1 | P1 | USB connector 1 | USB1 |
|-------------------+----------+------------------+----------|
| Serial port 2 | P2 | USB connector 2 | USB2 |
|-------------------+----------+------------------+----------|
| Floppy drive | P3 | VRM connector | VRM |
| interface | | | |
|-------------------+----------+------------------+----------|
| Parallel port | P4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | Factory configured - do not alter | J2 | Closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | J3 | Open |
|---+-----------------------------------+-------+------------|
| | PCI bus clock speed select | J15 | Pins 1 & 2 |
| | 33MHz/66MHz | | closed |
|---+-----------------------------------+-------+------------|
| | PCI bus clock speed select | J15 | Pins 2 & 3 |
| | 25MHz/75MHz | | closed |
|---+-----------------------------------+-------+------------|
| » | CMOS memory normal operation | J18 | Open |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | J18 | Closed |
|---+-----------------------------------+-------+------------|
| | PS/2 mouse IRQ12 enabled | J19 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | PS/2 mouse IRQ12 disabled | J19 | Pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 128MB | (2) 16M x 36 | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 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) 16M x 36 | (2) 16M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-----------+----------------+---------------+---------------|
| 256KB | (2) 32K x 32 | None | (1) 32K x 8 |
|-----------+----------------+---------------+---------------|
| 512KB | (2) 32K x 32 | (2) 32K x 32 | (1) 32K x 8 |
|------------------------------------------------------------|
| Note: The location of banks 0 & 1 and the TAG is |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J1 | J9 | J10 | J11 | J12 |
|----------+----------+----------+---------+--------+--------|
| 256KB | Open | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 512KB | Closed | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier| J5 | J6 | J7 | J8 |
|---------+-----------+----------+------+------+------+------|
| 75MHz | 50MHz | 1.5x |Closed|Closed| Open | Open |
|---------+-----------+----------+------+------+------+------|
| 90MHz | 60MHz | 1.5x |Closed| Open | Open | Open |
|---------+-----------+----------+------+------+------+------|
| 100MHz | 50MHz | 1.5x | Open |Closed| Open | Open |
|---------+-----------+----------+------+------+------+------|
| 120MHz | 60MHz | 2x |Closed| Open | Open |Closed|
|---------+-----------+----------+------+------+------+------|
| 133MHz | 66MHz | 2x | Open |Closed| Open |Closed|
|---------+-----------+----------+------+------+------+------|
| 150MHz | 60MHz | 2.5x |Closed| Open |Closed|Closed|
|---------+-----------+----------+------+------+------+------|
| 166MHz | 66MHz | 2.5x | Open |Closed|Closed|Closed|
|---------+-----------+----------+------+------+------+------|
| 180MHz | 60MHz | 3x |Closed| Open |Closed| Open |
|---------+-----------+----------+------+------+------+------|
| 200MHz | 66MHz | 3x | Open |Closed|Closed| Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | J14 |
|-----------------------------+------------------------------|
| » | NO VRM module installed | Pins 1 & 2, 3 & 4, 5 & 6 |
| | | closed |
|---+-------------------------+------------------------------|
| | 2.8v VRM installed | Open |
|---+-------------------------+------------------------------|
| | 3.1v VRM installed | Open |
+------------------------------------------------------------+