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# UNIDENTIFIED
XTT
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 |
|---------------------+------------+--------------+----------|
| Power LED & keylock | JP7 | Turbo switch | JP8 pins |
| | | | 3 & 4 |
|---------------------+------------+--------------+----------|
| Reset switch | JP8 pins 1 | Speaker | JP9 |
| | & 2 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| | Wait state select 3 wait states | JP3 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Wait state select 2 wait states | JP3 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | SW1/5 is set to on | JP5 | Closed |
|---+-----------------------------------+-------+------------|
| | SW1/5 is set to off | JP5 | Open |
|---+-----------------------------------+-------+------------|
| ยป | Factory configured - do not alter | SW1/1 | Off |
|---+-----------------------------------+-------+------------|
| | NPU not installed | SW1/2 | On |
|---+-----------------------------------+-------+------------|
| | NPU installed | SW1/2 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|---------+------------+------------+------------+-----------|
| 256KB | (9) 41256 | None | None | None |
|---------+------------+------------+------------+-----------|
| 512KB | (9) 41256 | (9) 41256 | None | None |
|---------+------------+------------+------------+-----------|
| 640KB | (9) 41256 | (9) 41256 | (9) 41256 | None |
|---------+------------+------------+------------+-----------|
| 640KB | (9) 41256 | (9) 41256 | (9) 4164 | (9) 4164 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Number of banks with 41256 | JP4 |
| chips installed | |
|---------------------------------+--------------------------|
| 0 | Pins 1 & 3, 2 & 4 closed |
|---------------------------------+--------------------------|
| 1 | Pins 2 & 4 closed |
|---------------------------------+--------------------------|
| 2 | Pins 1 & 3 closed |
|---------------------------------+--------------------------|
| 3 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Banks used | SW1/3 | SW1/4 |
|--------------------+-------------------+-------------------|
| 1 | On | On |
|--------------------+-------------------+-------------------|
| 2 | On | Off |
|--------------------+-------------------+-------------------|
| 3 | Off | On |
|--------------------+-------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP6 |
|-------------------------------+----------------------------|
| Switchable through keyboard | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| 4.77MHz | Open |
|-------------------------------+----------------------------|
| 8MHz | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE SELECTION |
|------------------------------------------------------------|
| Drives installed | SW1/7 | SW1/8 |
|--------------------+-------------------+-------------------|
| 1 | On | On |
|--------------------+-------------------+-------------------|
| 2 | On | Off |
|--------------------+-------------------+-------------------|
| 3 | Off | On |
|--------------------+-------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR SELECTION |
|------------------------------------------------------------|
| Type | SW1/5 | SW1/6 |
|--------------------+-------------------+-------------------|
| EGA | On | On |
|--------------------+-------------------+-------------------|
| Color (80 x 25) | On | Off |
|--------------------+-------------------+-------------------|
| Color (40 x 25) | Off | On |
|--------------------+-------------------+-------------------|
| Monochrome | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS SELECTION |
|------------------------------------------------------------|
| Type | JP2 |
|-------+----------------------------------------------------|
| 2764 | Pins 3 & 15, 4 & 14, 5 & 13, 6 & 12, 7 & 11, 8 & |
| | 10 closed |
|-------+----------------------------------------------------|
| 27128 | Pins 2 & 15, 3 & 14, 4 & 13, 5 & 12, 6 & 11, 7 & |
| | 10 closed |
|-------+----------------------------------------------------|
| 27256 | Pins 1 & 15, 2 & 14, 3 & 13, 4 & 12, 5 & 11, 6 & |
| | 10 closed |
+------------------------------------------------------------+