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# PC CALC, INC.
AT-TURBO 286 1800
Processor 80286
Processor Speed 15MHz
Chip Set None
Max. Onboard DRAM 1MB
Cache None
BIOS Phoenix
Dimensions 355mm x 304mm
I/O Options None
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | J19 | Turbo switch | J25 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J20 | Turbo LED | J27 |
|---------------------+----------+----------------+----------|
| Reset switch | J24 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-----------------------------------+--------+---------------|
| » | DRAM select 1 wait state | E1 | Open |
|---+-------------------------------+--------+---------------|
| | DRAM select 0 wait states | E1 | Closed |
|---+-------------------------------+--------+---------------|
| » | NPU speed select high | J29 | pins 1 & 2 |
| | | | closed |
|---+-------------------------------+--------+---------------|
| | NPU speed select low | J29 | pins 2 & 3 |
| | | | closed |
|---+-------------------------------+--------+---------------|
| » | Monitor type select color | SW1 | Closed |
|---+-------------------------------+--------+---------------|
| | Monitor type select | SW1 | Open |
| | monochrome | | |
|---+-------------------------------+--------+---------------|
| » | 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 | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 512KB | (18) 41256 | NONE |
|------------------+--------------------+--------------------|
| 640KB | (18) 41256 | (18) 4164 |
|------------------+--------------------+--------------------|
| 1MB | (18) 41256 | (18) 41256 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J17 | J18 |
|----------------------+------------------+------------------|
| 512KB | pins 2 & 3 | pins 2 & 3 |
| | closed | closed |
|----------------------+------------------+------------------|
| 640KB | pins 2 & 3 | pins 1 & 2 |
| | closed | closed |
|----------------------+------------------+------------------|
| 1MB (640KB | pins 1 & 2 | pins 1 & 2 |
| base/384KB extended) | closed | closed |
|----------------------+------------------+------------------|
| 1MB (512KB | pins 1 & 2 | pins 2 & 3 |
| base/512KB extended) | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTERNAL BATTERY CONFIGURATION |
|------------------------------------------------------------|
| Size | J22 | J31 |
|--------------------+-------------------+-------------------|
| Lithium | Closed | Open |
|--------------------+-------------------+-------------------|
| Rechargeable | Closed | Closed |
+------------------------------------------------------------+