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# AMERICAN MEGATRENDS, INC.
386 AT MARK II SYSTEM MOTHERBOARD
Processor 80386
Processor Speed 16/20/25/33MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard Memory 16MB (8MB on external memory card)
Maximum Video Memory None
Cache None
BIOS AMI
Dimensions 355mm x 304mm
I/O Options External memory card
NPU Options 80387/3167
IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Turbo LED | J1 | Power LED & keylock | J8 |
|---------------+----------+----------------------+----------|
| Reset switch | J2 | External battery | J9 |
|---------------+----------+----------------------+----------|
| Speaker | J7 | External memory card | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| ยป | Factory configured - do not | J26 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | Factory configured - do not | SW/1 | Off |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | Monitor type select color | SW/2 | On |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | SW/2 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+---------------------+----------------------|
| 1MB | (36) 41256 | None |
|---------------+---------------------+----------------------|
| 1MB | None | (4) 256K x 9 |
|---------------+---------------------+----------------------|
| 2MB | (36) 41256 | (4) 256K x 9 |
|---------------+---------------------+----------------------|
| 4MB | (36) 411000 | None |
|---------------+---------------------+----------------------|
| 4MB | None | (4) 1M x 9 |
|---------------+---------------------+----------------------|
| 5MB | (36) 41256 | (4) 1M x 9 |
|---------------+---------------------+----------------------|
| 5MB | (36) 411000 | (4) 256K x 9 |
|---------------+---------------------+----------------------|
| 8MB | (36) 411000 | (4) 1M x 9 |
|---------------+---------------------+----------------------|
| 16MB | None | (4) 4M x 9 |
|------------------------------------------------------------|
| Note: Board will accept 441000 chips but the configuration |
| was not available. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Bank 0 chips | Bank 1 chips | J27 |
|----------------+----------------+--------------------------|
| Installed | Not installed | Pins 1 & 2, 3 & 4 closed |
|----------------+----------------+--------------------------|
| Not installed | Installed | Pins 2 & 3, 4 & 5 closed |
|----------------+----------------+--------------------------|
| 41256 | 256K/1M | Pins 1 & 2, 3 & 4 closed |
|----------------+----------------+--------------------------|
| 411000 | 256K/1M | Pins 2 & 3, 4 & 5 closed |
|----------------+----------------+--------------------------|
| 441000 | Any chip type | Pins 1 & 2, 3 & 4 closed |
|----------------+----------------+--------------------------|
| Any chip type | 4M | Pins 2 & 3, 4 & 5 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 2 | Bank 3 |
|------------------+--------------------+--------------------|
| 8MB | (18) 411000 | (18) 411000 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Mark II | BASE board | SW/1 | SW/2 | SW/3 |
| memory | memory | | | |
|------------+-----------------+---------+---------+---------|
| 640KB | 1 bank | Off | On | On |
|------------+-----------------+---------+---------+---------|
| 896KB | 2 banks | On | On | On |
|------------+-----------------+---------+---------+---------|
| 1664KB | 1 bank | Off | Off | On |
|------------+-----------------+---------+---------+---------|
| 1920KB | 2 banks | On | Off | On |
|------------+-----------------+---------+---------+---------|
| 3712KB | 1 bank | Off | On | On |
|------------+-----------------+---------+---------+---------|
| 3968KB | 2 banks | On | On | On |
|------------+-----------------+---------+---------+---------|
| 4736KB | 1 bank | Off | On | Off |
|------------+-----------------+---------+---------+---------|
| 4992KB | 2 banks | On | On | Off |
|------------+-----------------+---------+---------+---------|
| 7808KB | 1 bank | Off | Off | On |
|------------+-----------------+---------+---------+---------|
| 8064KB | 2 banks | On | Off | On |
|------------+-----------------+---------+---------+---------|
| N/A* | 2 banks | On | Off | Off |
|------------------------------------------------------------|
| Note: * = Memory configuration in the 14MB & 15MB region |
| is enabled. For all other configurations, the region is |
| disabled. |
+------------------------------------------------------------+
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