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# AMERICAN MEGATRENDS, INC.
286 MOTHERBOARD
Processor 80286
Processor Speed 8/10/12MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard Memory 1MB
Maximum Video Memory None
Cache None
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+--------------+------------|
| Speaker | J24 | Reset switch | J29 pins 1 |
| | | | & 2 |
|---------------------+----------+--------------+------------|
| Power LED & keylock | J26 | Turbo LED | J29 pins 3 |
| | | | & 4 |
|---------------------+----------+--------------+------------|
| Reset switch | J28 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| ยป | Factory configured - do not | J15 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | ROM wait state select 2 wait | J17 | Closed |
| | states | | |
|---+---------------------------------+-------+--------------|
| | ROM wait state select 1 wait | J17 | Open |
| | state | | |
|---+---------------------------------+-------+--------------|
| | Monitor type select color | J23 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | J23 | Open |
|---+---------------------------------+-------+--------------|
| | I/O wait state enabled | J27 | Closed |
|---+---------------------------------+-------+--------------|
| | I/O wait state disabled | J27 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 512KB | (18) 41256 | None |
|------------------+--------------------+--------------------|
| 640KB | (18) 41256 | (18) 4164 |
|------------------+--------------------+--------------------|
| 1MB | (18) 41256 | (18) 41256 |
|------------------------------------------------------------|
| Note: The location of banks 0 & 1 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J21 | J22 |
|-------------------+--------------------+-------------------|
| 512KB | Closed | Closed |
|-------------------+--------------------+-------------------|
| 640KB | Open | Closed |
|-------------------+--------------------+-------------------|
| 1MB | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RAM WAIT STATE SELECTION |
|------------------------------------------------------------|
| Wait state | J16 | J18 |
|--------------------+-------------------+-------------------|
| 0 | Open | Closed |
|--------------------+-------------------+-------------------|
| 1 | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS SELECTION |
|------------------------------------------------------------|
| Type | J30 | J31 |
|------------------+--------------------+--------------------|
| 27128 | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 27256 | Open | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 27512 | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+