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# DTK COMPUTER, INC.
PEM-2531D
Processor 80386DX
Processor Speed 25MHz
Chip Set DTK
Max. Onboard DRAM 16MB (8MB on external memory card)
Cache None
BIOS DTK
Dimensions 333mm x 222mm
I/O Options 32-bit external memory card slot (PEI-307)
NPU Options 80387/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------+----------+------------------------+----------|
| Power LED & | J1 | Turbo switch | J4 |
| keylock | | | |
|-------------+----------+------------------------+----------|
| Speaker | J2 | Reset switch | J5 |
|-------------+----------+------------------------+----------|
| Turbo LED | J3 | 32-bit external memory | S1 |
| | | card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | CPU speed select fast | J4 | Open |
|---+---------------------------+---------------+------------|
| | CPU speed select slow | J4 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | CPU speed select | J4 | pins 2 & 3 |
| | switchable from keyboard | | closed |
|---+---------------------------+---------------+------------|
| » | NPU disabled | W1 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | NPU enabled | W1 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Monitor type select | W2 | pins 1 & 2 |
| | monochrome | | closed |
|---+---------------------------+---------------+------------|
| | Monitor type select color | W2 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Bus speed select CPU/2 | SW1/7 | Off |
|---+---------------------------+---------------+------------|
| | Bus speed select CPU/4 | SW1/7 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/8 |
|---------+----------+---------+---------+---------+---------|
| 1MB | Off | On | On | On | Off |
|---------+----------+---------+---------+---------+---------|
| 2MB | On | Off | On | On | On |
|---------+----------+---------+---------+---------+---------|
| 4MB | Off | Off | Off | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 5MB | Off | On | Off | On | Off |
|---------+----------+---------+---------+---------+---------|
| 8MB | On | On | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait state | Read state | SW1/5 | SW1/6 |
|---------------+---------------+--------------+-------------|
| 1 | 3 | Off | On |
|---------------+---------------+--------------+-------------|
| 1 | 2 | On | Off |
|---------------+---------------+--------------+-------------|
| 2 | 3 | On | On |
+------------------------------------------------------------+