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# UNIDENTIFIED
TURBO MAIN BOARD (426A)
Processor 8088
Processor Speed 4.77/8MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard Memory 640KB
Maximum Video Memory None
Cache None
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options None
NPU Options 8087
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------------+------------+-----------+-----------|
| Turbo switch (to | JP5 | Power LED | JP9 pins |
| turbo switch button) | | | 3 & 4 |
|-----------------------+------------+-----------+-----------|
| Turbo LED | JP9 pins 1 | Speaker | P4 |
| | & 2 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|------------------------------------+--------+--------------|
| » | Factory configured - do not | JP1 | Unidentified |
| | alter | | |
|----+-------------------------------+--------+--------------|
| | Turbo enabled | JP6 | Closed |
|----+-------------------------------+--------+--------------|
| | Turbo disabled | JP6 | Open |
|----+-------------------------------+--------+--------------|
| | Turbo enabled (CTRL, ALT, +) | JP7 | Closed |
|----+-------------------------------+--------+--------------|
| | Turbo disabled (CTRL, ALT, -) | JP7 | Open |
|----+-------------------------------+--------+--------------|
| | Keyboard lock disabled | JP8 | Closed |
|----+-------------------------------+--------+--------------|
| | Keyboard lock enabled | JP8 | Open |
|----+-------------------------------+--------+--------------|
| » | Factory configured - do not | SW1/1 | Off |
| | alter | | |
|----+-------------------------------+--------+--------------|
| | NPU not installed | SW1/2 | On |
|----+-------------------------------+--------+--------------|
| | NPU installed | SW1/2 | Off |
|------------------------------------------------------------|
| Note: JP6 is for turbo selectable through hardware. |
| JP7 is for turbo selectable through software. Both |
| jumpers cannot be closed at the same time. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------------+------------+------------+----------+----------|
| 256KB (A) | (9) 4164 | (9) 4164 | (9) 4164 | (9) 4164 |
|------------+------------+------------+----------+----------|
| 256KB (B) | (9) 41256 | None | None | None |
|------------+------------+------------+----------+----------|
| 512KB | (9) 41256 | (9) 41256 | None | None |
|------------+------------+------------+----------+----------|
| 640KB | (9) 41256 | (9) 41256 | (9) 4164 | (9) 4164 |
|------------------------------------------------------------|
| Note: The location of banks 0, 1, 2, & 3 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 |
|------------+--------------------------+--------------------|
| 256KB (A) | Pins 1 & 3, 5 & 7 closed | Pins 2 & 4 closed |
|------------+--------------------------+--------------------|
| 256KB (B) | Pins 2 & 4, 6 & 8 closed | Pins 1 & 3 closed |
|------------+--------------------------+--------------------|
| 512KB | Pins 2 & 4, 6 & 8 closed | Pins 1 & 3 closed |
|------------+--------------------------+--------------------|
| 640KB | Pins 2 & 4, 6 & 8 closed | Pins 1 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | SW1/3 | SW1/4 |
|--------------------+-------------------+-------------------|
| 128KB | Off | On |
|--------------------+-------------------+-------------------|
| 192KB | On | Off |
|--------------------+-------------------+-------------------|
| 256KB | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE SELECTION |
|------------------------------------------------------------|
| Drives installed | SW1/7 | SW1/8 |
|--------------------+-------------------+-------------------|
| 1 | On | On |
|--------------------+-------------------+-------------------|
| 2 | Off | On |
|--------------------+-------------------+-------------------|
| 3 | On | Off |
|--------------------+-------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR SELECTION |
|------------------------------------------------------------|
| Type | SW1/5 | SW1/6 |
|--------------------+-------------------+-------------------|
| None | On | On |
|--------------------+-------------------+-------------------|
| Color (40 x 20) | Off | On |
|--------------------+-------------------+-------------------|
| Color (80 x 25) | On | Off |
|--------------------+-------------------+-------------------|
| Monochrome | Off | Off |
+------------------------------------------------------------+