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# UNIDENTIFIED
8MHz SYSTEM BOARD
Processor 8088
Processor Speed 4.77/8MHz
Chip Set Unknown
Max. Onboard DRAM 640KB
Cache None
BIOS ATI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Speaker | CN1 | Reset switch | JP1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
|---------------------------------------+---------+----------|
| » | Factory configured - do not alter | SW1/1 | Off |
|---+-----------------------------------+---------+----------|
| » | NPU enabled | SW1/2 | On |
|---+-----------------------------------+---------+----------|
| | NPU disabled | SW1/2 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
|Size | Bank 0 |Bank 1 |Bank 2 |Bank 3 | JP3 |SW1/3|SW1/4|
|-----+--------+-------+-------+-------+---------+-----+-----|
|256KB|(9) 4164| (9) | (9) | (9) |pins 1 & | On | Off |
| | | 4164 | 4164 | 4164 | 2 | | |
|-----+--------+-------+-------+-------+---------+-----+-----|
|640KB| (9) | (9) | (9) | (9) |pins 2 & | Off | On |
| | 41256 | 41256 | 41256 | 41256 | 3 | | |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
| |
|The exact locations of Banks 0 through 4 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | SW1/5 | SW1/6 |
|----------------------+------------------+------------------|
| No display adapter | On | On |
|----------------------+------------------+------------------|
| Color (40 x 20 mode) | Off | On |
|----------------------+------------------+------------------|
| Color (80 x 25 mode) | On | Off |
|----------------------+------------------+------------------|
| Monochrome or both | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVES INSTALLED |
|------------------------------------------------------------|
| Drive(s) Installed | SW1/switch 7 | SW1/switch 8 |
|--------------------+-------------------+-------------------|
| 1 | On | On |
|--------------------+-------------------+-------------------|
| 2 | Off | On |
|--------------------+-------------------+-------------------|
| 3 | On | Off |
|--------------------+-------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP2 |
|-------------------------+----------------------------------|
| 4.77MHz | pins 2 & 3 closed |
|-------------------------+----------------------------------|
| 8MHz | Open |
|------------------------------------------------------------|
| Note:The system runs at 8MHz when the power is switched on |
| but can be changed to 4mhz by pressing <CTRL> <ALT> |
| <-> and closing pins 1 & 2. To return back to high speed, |
| press the three keys once again. |
+------------------------------------------------------------+