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# AMERICAN MEGATRENDS, INC.
ATLAS PCI PENTIUM ISA
Processor Pentium
Processor 90/100MHz
Speed
Chip Set American Megatrends
Max. Onboard 128MB
DRAM
Cache 256/512KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit PCI bus slots (4), floppy drive interface,
IDE interface (2), green PC feature, parallel
port, PS/2 mouse port, serial ports (2), green PC
monitor connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Green PC power | J1 | Power LED & | J15 |
| connector | | keylock | |
|------------------+----------+-------------------+----------|
| Serial port 1 | J4 | Speaker | J17 |
|------------------+----------+-------------------+----------|
| Serial port 2 | J5 | Reset switch | J18 |
|------------------+----------+-------------------+----------|
| Parallel port | J7 | Turbo switch | J20 |
|------------------+----------+-------------------+----------|
| Floppy drive | J8 | Turbo LED | J24 |
| interface | | | |
|------------------+----------+-------------------+----------|
| IDE interface | J10 | Green PC monitor | J25 |
| (secondary) | | connector | |
|------------------+----------+-------------------+----------|
| IDE interface | J11 | IDE interface IDE | J28 |
| (primary) | | | |
|------------------+----------+-------------------+----------|
| PS/2 mouse port | J13 | 32-bit PCI bus | SL1 - |
| | | slots | SL4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Cache memory type select write | J29 | Open |
| | back | | |
|---+----------------------------------+--------+------------|
| | Cache memory type select write | J29 | Closed |
| | through | | |
|---+----------------------------------+--------+------------|
| » | Parallel port IRQ select IRQ7 | J37 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Parallel port IRQ select IRQ5 | J37 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Serial port 2 IRQ select IRQ3 | J38 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Serial port 2 IRQ select IRQ4 | J38 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Serial port 1 IRQ select IRQ4 | J39 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Serial port 1 IRQ select IRQ3 | J39 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Onboard mouse IRQ12 enabled | J40 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Bus mouse IRQ12 enabled | J40 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J47 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | J48 | Open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J48 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J51 | Open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | NONE |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 16M x 36 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 256KB | (8) 32K x 8 |
|----------------------------+-------------------------------|
| 512KB | (8) 64K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J21 | J22 | J23 |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 512KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU OUTPUT SIGNAL BUFFER CONFIGURATION |
|------------------------------------------------------------|
| Output signal buffer | J30 | J32 |
|----------------------+------------------+------------------|
| Normal system | Open | Open |
|----------------------+------------------+------------------|
| Loaded system | Closed | Open |
|----------------------+------------------+------------------|
| Extra loaded system | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP33 |
|-------------------------------+----------------------------|
| 60/66/90i/100iMHz | Closed |
|-------------------------------+----------------------------|
| 50/100iMHz | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 3.3 VOLT POWER SOURCE CONFIGURATION (INTERNAL) |
|------------------------------------------------------------|
| J3 | J34 | P3 & P4 |
|-----------+---------------------------------+--------------|
| Open | pins 1 & 2, 3 & 4, 5 & 6 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 3.3 VOLT POWER SOURCE CONFIGURATION (EXTERNAL) |
|------------------------------------------------------------|
| J3 | J34 | P3 & P4 |
|---------------------------------+-----------+--------------|
| pins 1 & 2, 3 & 4, 5 & 6 closed | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT DMA CONFIGURATION |
|------------------------------------------------------------|
| DMA channel | J43 | J44 |
|------------------+--------------------+--------------------|
| None | Open | Open |
|------------------+--------------------+--------------------|
| DRQ0 | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| DRQ1 | pins 3 & 4 closed | pins 3 & 4 closed |
|------------------+--------------------+--------------------|
| DRQ3 | pins 5 & 6 closed | pins 5 & 6 closed |
+------------------------------------------------------------+