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# AMERICAN MEGATRENDS, INC.
AMI-386XT SERIES-6
Processor 80386DX
Processor Speed 8/16/20/25MHz
Chip Set AMI
Max. Onboard DRAM None (16MB on 32-bit external memory cards)
Cache 64KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card slot
NPU Options 80387DX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Turbo LED | J1 | Power LED & keylock | J20 |
|--------------+----------+-----------------------+----------|
| Reset switch | J2 | External battery | J21 |
|--------------+----------+-----------------------+----------|
| Speaker | J19 | 32-bit external | S1 |
| | | memory card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|---------------------------------+---------------+----------|
| » | BIOS type select 27128 | J4 | pins 1 & |
| | | | 2 closed |
|---+-----------------------------+---------------+----------|
| | BIOS type select 27256 | J4 | pins 2 & |
| | | | 3 closed |
|---+-----------------------------+---------------+----------|
| » | Monitor type select color | SW1/1 | On |
|---+-----------------------------+---------------+----------|
| | Monitor type select | SW1/1 | Off |
| | monochrome | | |
|---+-----------------------------+---------------+----------|
| » | CPU speed select 8MHz | SW1/2 | On |
|---+-----------------------------+---------------+----------|
| | CPU speed select | SW1/2 | Off |
| | 16/20/25MHz | | |
|---+-----------------------------+---------------+----------|
| » | NPU disabled | SW1/3 | On |
|---+-----------------------------+---------------+----------|
| | NPU enabled | SW1/3 | Off |
|---+--------------------------------------------------------|
| | Note : The cache is factory installed and can not be |
| | altered. |
| | |
| | The size and location of the cache and tag chips are |
| | unknown. |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| DRAM CONFIGURATION (CARD 1) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (36) 41256 | None |
|------------------+--------------------+--------------------|
| 2MB | (36) 41256 | (36) 41256 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION (CARD 1) |
|------------------------------------------------------------|
| Size | Base Memory | SW2/1 | SW2/2 | SW2/3 |
|------------+-------------+-----------+----------+----------|
| 512KB | 512KB | Off | Off | Off |
|------------+-------------+-----------+----------+----------|
| 640KB | 640KB | Off | On | Off |
|------------+-------------+-----------+----------+----------|
| 896KB | 512KB | Off | Off | On |
|------------+-------------+-----------+----------+----------|
| 1024KB | 640KB | Off | On | On |
|------------+-------------+-----------+----------+----------|
| 1536KB | 512KB | On | Off | Off |
|------------+-------------+-----------+----------+----------|
| 1664KB | 640KB | On | On | Off |
|------------+-------------+-----------+----------+----------|
| 1920KB | 512KB | On | Off | On |
|------------+-------------+-----------+----------+----------|
| 1920KB | 640KB | On | On | On |
+------------------------------------------------------------+
IMG IMG 3
+------------------------------------------------------------+
| DRAM CONFIGURATION (CARD-2) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (36) 411000 | None |
|------------------+--------------------+--------------------|
| 8MB | (36) 411000 | (36) 411000 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION (CARD-2) |
|------------------------------------------------------------|
| Size | Base Memory | SW3/1 | SW3/2 | SW3/3 |
|------------+-------------+-----------+----------+----------|
| 3584KB | 512KB | Off | Off | Off |
|------------+-------------+-----------+----------+----------|
| 3712KB | 640KB | Off | On | Off |
|------------+-------------+-----------+----------+----------|
| 3968KB | 512KB | Off | Off | On |
|------------+-------------+-----------+----------+----------|
| 4096KB | 640KB | Off | On | On |
|------------+-------------+-----------+----------+----------|
| 7680KB | 512KB | On | Off | Off |
|------------+-------------+-----------+----------+----------|
| 7808KB | 640KB | On | On | Off |
|------------+-------------+-----------+----------+----------|
| 8064KB | 512KB | On | Off | On |
|------------+-------------+-----------+----------+----------|
| 8192KB | 640KB | On | On | On |
+------------------------------------------------------------+
IMG IMG 4
+------------------------------------------------------------+
| DAUGHTER BOARD DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|----------------+---------------------+---------------------|
| 4MB | (36) 411000 | None |
|----------------+---------------------+---------------------|
| 8MB | (36) 411000 | (36) 411000 |
|------------------------------------------------------------|
| Note: Each system memory card can be connected to a |
| daughter board, for an additional 4 to 8MB of memory. The |
| daughter board's Strips J2 & J3 (component side) plug into |
| the J2 & J3 Strips (solder side) on the system memory |
| boards. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DAUGHTER BOARD DRAM SWITCH CONFIGURATION FOR CARD 1 |
|------------------------------------------------------------|
| Size | Base Memory | SW2/1 | SW2/2 |
|--------------+-------------------+-------------+-----------|
| 5632KB | 512KB | Off | Off |
|--------------+-------------------+-------------+-----------|
| 5760KB | 640KB | Off | On |
|--------------+-------------------+-------------+-----------|
| 9728KB | 512KB | On | Off |
|--------------+-------------------+-------------+-----------|
| 9856KB | 640KB | On | On |
|------------------------------------------------------------|
| Note: The system memory card must be filled to maximum |
| capacity (2MB) to implement the daughter board. When the |
| daughter board is plugged into the system memory board the |
| switches previously used to set the base memory size on |
| the system memory card is then used to set the base memory |
| size of the daughter board. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DAUGHTER BOARD DRAM SWITCH CONFIGURATION FOR CARD 2 |
|------------------------------------------------------------|
| Size | Base Memory | SW3/1 | SW3/2 | SW3/3 |
|-------------+-------------+----------+----------+----------|
| 11776KB | 512KB | Off | Off | N/A |
|-------------+-------------+----------+----------+----------|
| 11904KB | 640KB | Off | On | N/A |
|-------------+-------------+----------+----------+----------|
| 14848KB | 512KB | On | Off | On |
|-------------+-------------+----------+----------+----------|
| 14976KB | 640KB | On | On | On |
|-------------+-------------+----------+----------+----------|
| 15744KB | 512KB | On | Off | Off |
|-------------+-------------+----------+----------+----------|
| 15872KB | 640KB | On | On | Off |
|------------------------------------------------------------|
| Note: The system memory card must be filled to maximum |
| capacity (8MB) to implement the daughter board. When the |
| daughter board is plugged into the system memory board, |
| the switches previously used to set the base memory size |
| on the system memory card are then used to set the base |
| memory size of the daughter board. |
+------------------------------------------------------------+