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# UNIDENTIFIED
TURBO MAINBOARD (4.77/10MHZ)
Processor 8088
Processor Speed 4.77/10MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard Memory 640KB
Maximum Video Memory None
Cache None
BIOS Unidentified
Dimensions 276mm x 196mm
I/O Options None
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------+----------------|
| Speaker | JP1 | Turbo LED | JP5 pins 1 & 2 |
|----------------+----------+---------------+----------------|
| Keylock | JP3 | Power LED | JP5 pins 3 & 4 |
|----------------+----------+---------------+----------------|
| Reset switch | JP4 | Turbo switch | JP6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+--------+-----------|
| » | Factory configured - do not alter | SW1/1 | Off |
|---+-----------------------------------+--------+-----------|
| » | NPU not installed | SW1/2 | On |
|---+-----------------------------------+--------+-----------|
| | NPU installed | SW1/2 | Off |
|---+-----------------------------------+--------+-----------|
| » | Factory configured - do not alter | SW1/3 | Off |
|---+-----------------------------------+--------+-----------|
| » | Factory configured - do not alter | SW1/4 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank | Bank 3 | Bank |
| | | | | 2A | | 3A |
|-------+---------+--------+--------+-------+--------+-------|
| 256KB | (9) | None | None | None | None | None |
| | 41256 | | | | | |
|-------+---------+--------+--------+-------+--------+-------|
| 512KB | (9) | (9) | None | None | None | None |
| | 41256 | 41256 | | | | |
|-------+---------+--------+--------+-------+--------+-------|
| 576KB | (9) | (9) | (2) | (1) | None | None |
| | 41256 | 41256 | 4464 | 4164 | | |
|-------+---------+--------+--------+-------+--------+-------|
| 640KB | (9) | (9) | (2) | (1) | (2) | (1) |
| | 41256 | 41256 | 4464 | 4164 | 4464 | 4164 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TURBO SELECTION |
|------------------------------------------------------------|
| Type | JP7 | JP8 |
|---------------------------+----------------+---------------|
| Always in turbo mode | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed |
|---------------------------+----------------+---------------|
| Turbo select through | Pins 2 & 3 | Pins 1 & 2 |
| software | closed | closed |
|---------------------------+----------------+---------------|
| Turbo select through | Pins 1 & 2 | Pins 1 & 2 |
| software & keyboard | closed | closed |
|------------------------------------------------------------|
| Note: To toggle between normal and turbo modes, press |
| CTRL, ALT, + to enable turbo and CTRL, ALT, - to |
| disable turbo. |
+------------------------------------------------------------+