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# AMERICAN MEGATRENDS, INC.
ATLAS PCI LPX
Processor Pentium
Processor Speed 75/90/100/120/133/150MHz
Chip Set Unidentified
Video Chip Set ATI
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video 2MB
Memory
Cache 256/512KB
BIOS AMI
Dimensions 330mm x 228mm
I/O Options Floppy drive interface, green PC connector,
IDE interfaces (2), parallel port, PS/2 mouse
port, serial ports (2), VGA feature
connector, VGA port, riser slot, cache slot,
MIDI/joystick interface
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Floppy drive | J1 | Turbo LED | J32 |
| interface | | | |
|---------------------+----------+----------------+----------|
| IDE interface 1 | J2 | Chassis fan | J34 |
| | | power | |
|---------------------+----------+----------------+----------|
| MIDI/joystick | J3 | IDE interface | J36 |
| interface | | LED | |
|---------------------+----------+----------------+----------|
| IDE interface 2 | J4 | Parallel port | J37 |
|---------------------+----------+----------------+----------|
| PS/2 mouse port | J9 | VGA port | J41 |
|---------------------+----------+----------------+----------|
| Serial port 1 | J14 | VGA feature | J42 |
| | | connector | |
|---------------------+----------+----------------+----------|
| Serial port 2 | J19 | Green PC | J44 |
| | | connector | |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J26 | Cache slot | SL1 |
|---------------------+----------+----------------+----------|
| Reset switch | J28 | Riser slot | SL2 |
|---------------------+----------+----------------+----------|
| Speaker | J31 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| | Serial port 2 used as serial port | J8 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Serial port 2 used as IR | J8 | Pins 1 & 2 |
| | connector | | closed |
|---+-----------------------------------+-------+------------|
| » | Serial port 2 IRQ select IRQ3 | J11 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Serial port 2 IRQ select IRQ4 | J11 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Serial port 1 IRQ select IRQ4 | J12 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Serial port 1 IRQ select IRQ3 | J12 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Parallel port IRQ select IRQ7 | J13 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Parallel port IRQ select IRQ5 | J13 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | PS/2 mouse enabled | J20 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | PS/2 mouse disabled | J20 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Jumper information unavailable | J23 | N/A |
|---+-----------------------------------+-------+------------|
| | Jumper information unavailable | J24 | N/A |
|---+-----------------------------------+-------+------------|
| | Jumper information unavailable | J25 | N/A |
|---+-----------------------------------+-------+------------|
| | On board video enabled | J27 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | On board video disabled | J27 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | CMOS memory normal operation | J29 | Open |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | J29 | Closed |
|---+-----------------------------------+-------+------------|
| | Jumper information unavailable | J30 | N/A |
|---+-----------------------------------+-------+------------|
| | On board video IRQ enabled | J33 | Closed |
|---+-----------------------------------+-------+------------|
| | On board video IRQ disabled | J33 | Open |
|---+-----------------------------------+-------+------------|
| | Jumper information unavailable | J34 | N/A |
|---+-----------------------------------+-------+------------|
| | Jumper information unavailable | J35 | N/A |
|---+-----------------------------------+-------+------------|
| | Jumper information unavailable | J45 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|----------------+---------------------+---------------------|
| 2MB | (2) 256K x 36 | None |
|----------------+---------------------+---------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|----------------+---------------------+---------------------|
| 8MB | (2) 1M x 36 | None |
|----------------+---------------------+---------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|----------------+---------------------+---------------------|
| 10MB | (2) 256K x 36 | (2) 1M x 36 |
|----------------+---------------------+---------------------|
| 16MB | (2) 2M x 36 | None |
|----------------+---------------------+---------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|----------------+---------------------+---------------------|
| 18MB | (2) 2M x 36 | (2) 256K x 36 |
|----------------+---------------------+---------------------|
| 18MB | (2) 256K x 36 | (2) 2M x 36 |
|----------------+---------------------+---------------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 |
|----------------+---------------------+---------------------|
| 24MB | (2) 1M x 36 | (2) 2M x 36 |
|----------------+---------------------+---------------------|
| 32MB | (2) 4M x 36 | None |
|----------------+---------------------+---------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|----------------+---------------------+---------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|----------------+---------------------+---------------------|
| 34MB | (2) 256K x 36 | (2) 4M x 36 |
|----------------+---------------------+---------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|----------------+---------------------+---------------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 |
|----------------+---------------------+---------------------|
| 48MB | (2) 4M x 36 | (2) 2M 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 |
|----------------+---------------------+---------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|----------------+---------------------+---------------------|
| 66MB | (2) 256K x 36 | (2) 8M x 36 |
|----------------+---------------------+---------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|----------------+---------------------+---------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
|----------------+---------------------+---------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|----------------+---------------------+---------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|----------------+---------------------+---------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|----------------+---------------------+---------------------|
| 96MB | (2) 4M x 36 | (2) 8M x 36 |
|----------------+---------------------+---------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|----------------+---------------------+---------------------|
| 128MB | (2) 16M x 36 | None |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. Board also accepts x 32 |
| SIMMs. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | SL1 |
|----------------------------+-------------------------------|
| 256KB | Installed |
|----------------------------+-------------------------------|
| 512KB | Installed |
|------------------------------------------------------------|
| Note: Cache modules can be asynchronous, pipeline burst or |
| synchronous burst. Only one module can be installed at |
| SL1. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|-------------------+--------------------+-------------------|
| 1MB | 1MB | None |
|-------------------+--------------------+-------------------|
| 2MB | 1MB | 1MB |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is not configurable. |
| The size of the Bank 1 chips are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| CPU speed | Clock speed | J46 | J48 |
|---------------+---------------+--------------+-------------|
| 75MHz | 50MHz | Open | Open |
|---------------+---------------+--------------+-------------|
| 90MHz | 60MHz | Open | Open |
|---------------+---------------+--------------+-------------|
| 100MHz | 50MHz | Closed | Open |
|---------------+---------------+--------------+-------------|
| 100MHz | 66MHz | Open | Open |
|---------------+---------------+--------------+-------------|
| 120MHz | 60MHz | Closed | Open |
|---------------+---------------+--------------+-------------|
| 133MHz | 66MHz | Closed | Open |
|---------------+---------------+--------------+-------------|
| 150MHz | 50MHz | Open | Closed |
|---------------+---------------+--------------+-------------|
| 150MHz | 60MHz | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HOST CLOCK SELECTION |
|------------------------------------------------------------|
| Speed | J21 | J22 |
|-------------------+--------------------+-------------------|
| 50MHz | Closed | Closed |
|-------------------+--------------------+-------------------|
| 60MHz | Closed | Open |
|-------------------+--------------------+-------------------|
| 66MHz | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | J38 |
|-------------------------------+----------------------------|
| 3.135v - 3.45v (standard CPU) | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| 3.45v - 3.6v (VRE CPU) | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 3.3V POWER SUPPLY SELECTION |
|------------------------------------------------------------|
| Setting | J39 | J40 | J47 |
|----------------+---------------+-------------+-------------|
| Voltage | 1 & 2, 3 & 4, | Open | 1 & 2, 3 & |
| regulator | 5 & 6 | | 4, 5 & 6 |
|----------------+---------------+-------------+-------------|
| Power supply | 1 & 2, 3 & 4, | 1 & 2, 3 & | Open |
| | 5 & 6 | 4, 5 & 6 | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI HOST CLOCK SELECTION |
|------------------------------------------------------------|
| Speed | J43 |
|----------------------------+-------------------------------|
| 50MHz | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 60MHz | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 66MHz | Pins 1 & 2 closed |
+------------------------------------------------------------+