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# AMERICAN MEGATRENDS, INC.
ATLAS PCI - II
Processor Pentium
Processor Speed 75/90/100/120/133MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard 256MB DRAM (EDO supported)
Memory
Maximum Video None
Memory
Cache 256/512/1024KB
BIOS AMI
Dimensions 254mm x 203mm
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), green VGA interface, cache slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface 2 | J1 | Green PC | J27 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Serial port 1 | J3 | Reset switch | J29 |
|-------------------+----------+------------------+----------|
| Serial port 2 | J4 | Turbo LED | J33 |
|-------------------+----------+------------------+----------|
| Parallel port | J6 | IDE interface | J34 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Floppy drive | J7 | Green VGA | J42 |
| interface | | interface | |
|-------------------+----------+------------------+----------|
| IDE interface 1 | J8 | Chassis fan | J46 |
| | | power | |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J13 | 32-bit PCI slots | PC1 - |
| interface | | | PC4 |
|-------------------+----------+------------------+----------|
| Power LED & | J19 | Cache slot | SL1 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J22 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| | Jumper information unidentified | J20 | N/A |
|---+---------------------------------+-------+--------------|
| | Jumper information unidentified | J31 | N/A |
|---+---------------------------------+-------+--------------|
| » | PS/2 mouse IRQ12 enabled | J38 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | PS/2 mouse IRQ12 disabled | J38 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Jumper information unidentified | J45 | N/A |
|---+---------------------------------+-------+--------------|
| | Jumper information unidentified | J47 | N/A |
|---+---------------------------------+-------+--------------|
| | Jumper information unidentified | J50 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 512K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 256K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 256K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 1M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 512K 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 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 256K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 4M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K 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 |
|------------------+--------------------+--------------------|
| 68MB | (2) 8M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 512K 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) 16M x 36 | None |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 130MB | (2) 16M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 132MB | (2) 16M x 36 | (2) 512K 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) 16M x 36 | (2) 16M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | SL1 |
|------------------+--------------------+--------------------|
| 256KB (A) | (8) 32K x 8 | Not installed |
|------------------+--------------------+--------------------|
| 256KB (B) | None | Installed |
|------------------+--------------------+--------------------|
| 512KB (A) | (8) 64K x 8 | Not installed |
|------------------+--------------------+--------------------|
| 512KB (B) | None | Installed |
|------------------+--------------------+--------------------|
| 1MB (C) | (8) 128K x 8 | Not installed |
|------------------+--------------------+--------------------|
| 1MB (C) | None | Installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J16 | J26 | J28 |
|-----------+----------------+---------------+---------------|
| 256KB (A) | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 256KB (B) | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 512KB (A) | Pins 1 & 2 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 512KB (B) | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 1MB (C) | Pins 1 & 2 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 1MB (C) | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TYPE CONFIGURATION |
|------------------------------------------------------------|
| Setting | J30 |
|------------------------------+-----------------------------|
| SMT cache enabled | Pins 1 & 2 closed |
|------------------------------+-----------------------------|
| SMT cache disabled | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | J24 | J25 | J37 | J39 |
|------------+------------+------------+---------+-----------|
| 75MHz | Closed | Closed | Open | Open |
|------------+------------+------------+---------+-----------|
| 90MHz | Closed | Open | Open | Open |
|------------+------------+------------+---------+-----------|
| 100MHz | Open | Closed | Open | Open |
|------------+------------+------------+---------+-----------|
| 120MHz | Closed | Open | Open | Closed |
|------------+------------+------------+---------+-----------|
| 133MHz | Open | Closed | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | J11 |
|----------------------------+-------------------------------|
| VR | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| VRE | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | J2 | J12 | J21 |
|---------------------+------------+------------+------------|
| From regulator | Open | 1 & 2, 3 & | 1 & 2, 3 & |
| | | 4, 5 & 6 | 4, 5 & 6 |
|---------------------+------------+------------+------------|
| From regulator & | Open | 1 & 2, 3 & | Open |
| VRM | | 4, 5 & 6 | |
|---------------------+------------+------------+------------|
| From 3.3v power | 1 & 2, 3 & | Open | 1 & 2, 3 & |
| supply | 4, 5 & 6 | | 4, 5 & 6 |
+------------------------------------------------------------+