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# UNIDENTIFIED
TURBO MAIN BOARD
Processor 8088
Processor Speed 8MHz
Chip Set Unidentified
Max. Onboard DRAM 640KB
Cache None
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options None
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+----------------+---------------|
| Reset switch | JP1 | Turbo LED | P6 pins 1 & 2 |
|----------------+----------+----------------+---------------|
| Turbo LED | P3 | Reset switch | P6 pins |
|----------------+----------+----------------+---------------|
| Speaker | P4 | Keylock | P6 pins |
|----------------+----------+----------------+---------------|
| Turbo switch | P5 | Turbo LED | P7 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|------------------------+---------------+-------------------|
| » | Turbo enabled | P5 | pins 1 & 2 closed |
|---+--------------------+---------------+-------------------|
| | Turbo disabled | P5 | pins 3 & 4 closed |
|---+--------------------+---------------+-------------------|
| » | Turbo enabled | SW2/1 | Off |
|---+--------------------+---------------+-------------------|
| | Turbo disabled | SW2/1 | On |
|---+--------------------+---------------+-------------------|
| » | NPU disabled | SW2/2 | On |
|---+--------------------+---------------+-------------------|
| | NPU enabled | SW2/2 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|---------+------------+------------+------------+-----------|
| 64KB | (9) 4164 | NONE | NONE | NONE |
|---------+------------+------------+------------+-----------|
| 128KB | (9) 4164 | (9) 4164 | NONE | NONE |
|---------+------------+------------+------------+-----------|
| 192KB | (9) 4164 | (9) 4164 | (9) 4164 | NONE |
|---------+------------+------------+------------+-----------|
| 256KB | (9) 4164 | (9) 4164 | (9) 4164 | (9) 4164 |
|---------+------------+------------+------------+-----------|
| 256KB | (9) 41256 | NONE | NONE | NONE |
|---------+------------+------------+------------+-----------|
| 640KB | (9) 41256 | (9) 41256 | (9) 4164 | (9) 4164 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | SW2/3 | SW2/4 |
|--------------------+-------------------+-------------------|
| 64KB | On | On |
|--------------------+-------------------+-------------------|
| 128KB | Off | On |
|--------------------+-------------------+-------------------|
| 192KB | Off | On |
|--------------------+-------------------+-------------------|
| 256KB | Off | Off |
|--------------------+-------------------+-------------------|
| 640KB | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | JP2 |
|-------------------------------+----------------------------|
| Bank 0 & 1 = 41256 | Closed |
|-------------------------------+----------------------------|
| Bank 2 & 3 = 4164 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | JP2 |
|-------------------------------+----------------------------|
| Bank 0 & 1 = 4164 | Open |
|-------------------------------+----------------------------|
| Bank 2 & 3 = 4164 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR CONFIGURATION |
|------------------------------------------------------------|
| Type | SW2/5 | SW2/6 |
|--------------------+-------------------+-------------------|
| Monochrome | Off | Off |
|--------------------+-------------------+-------------------|
| 40 x 25 color | Off | On |
|--------------------+-------------------+-------------------|
| 80 x 25 color | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE CONFIGURATION |
|------------------------------------------------------------|
| Type | SW2/7 | SW2/8 |
|-------------------+--------------------+-------------------|
| 1 | On | On |
|-------------------+--------------------+-------------------|
| 2 | Off | On |
|-------------------+--------------------+-------------------|
| 3 | On | Off |
|-------------------+--------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+