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# IBM CORPORATION
AT-TURBO 286
Processor 80286
Processor Speed 6/8/10MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard Memory 1MB
Maximum Video Memory None
Cache None
BIOS Unidentified
Dimensions 355mm x 304mm
I/O Options None
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Speaker | J19 | External battery | J21 |
|-------------------+----------+------------------+----------|
| Power LED & | J20 | Reset switch | J24 |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| ยป | Factory configured - do not | J23 | Unidentified |
| | alter (wait state select) | | |
|---+---------------------------------+-------+--------------|
| | Monitor type select color | SW1 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | SW1 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | BIOS type select 27128 | U57 | Pins 1 & 8, |
| | | | 2 & 7 closed |
|---+---------------------------------+-------+--------------|
| | BIOS type select 27256 | U57 | Pins 3 & 6, |
| | | | 4 & 5 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Type | Bank 0 | Bank 1 |
|-------+----------------------------+-----------+-----------|
| 512KB | 512KB | (9) 41256 | None |
|-------+----------------------------+-----------+-----------|
| 640KB | 640KB | (9) 41256 | (9) 4164 |
|-------+----------------------------+-----------+-----------|
| 1MB | 640KB internal/384KB | (9) 41256 | (9) 41256 |
| | expansion | | |
|-------+----------------------------+-----------+-----------|
| 1MB | 512KB internal/512KB | (9) 41256 | (9) 41256 |
| | expansion | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J17 | J18 |
|------------------+--------------------+--------------------|
| 512KB | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 640KB | Pins 1 & 2 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 1MB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 1MB | Pins 2 & 3 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | J25 |
|----------------------------+-------------------------------|
| 6MHz | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 8MHz | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 10MHz | Pins 1 & 2 closed |
+------------------------------------------------------------+