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# HEDAKA
HED-918
Processor 8088/V20
Processor Speed 4.77/10MHz
Chip Set None
Max. Onboard DRAM 640KB
Cache None
BIOS AMI
Dimensions 217mm x 166mm
I/O Options None
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| Power LED | CN2 | Turbo LED | CN6 |
|-----------------+----------+--------------------+----------|
| Speaker | CN3 | External battery | CN7A |
|-----------------+----------+--------------------+----------|
| Reset switch | CN4 | Keylock | CN8 |
|-----------------+----------+--------------------+----------|
| Turbo switch | CN5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | CPU type select Intel | JP2 | pins 1 & 2 |
| | 8088 | | closed |
|---+---------------------------+---------------+------------|
| | CPU type select NEC V-20 | JP2 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/1 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | NPU disabled | SW1/2 | On |
|---+---------------------------+---------------+------------|
| | NPU enabled | SW1/2 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | 44256 Chips | 411000 Chips |
|-----------------+---------------------+--------------------|
| 0KB | NONE | NONE |
|-----------------+---------------------+--------------------|
| 128KB | U7 | NONE |
|-----------------+---------------------+--------------------|
| 256KB | U6 & U7 | NONE |
|-----------------+---------------------+--------------------|
| 384KB | U5, U6 & U7 | NONE |
|-----------------+---------------------+--------------------|
| 512KB | U4, U5, U6 & U7 | NONE |
|-----------------+---------------------+--------------------|
| 512KB | NONE | U4, U5, U6 & U7 |
|-----------------+---------------------+--------------------|
| 640KB | U3, U4, U5, U6 & U7 | NONE |
|-----------------+---------------------+--------------------|
| 640KB | U3 | U4, U5, U6 & U7 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER/SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | SW1/3 | SW1/4 |
|-------------+-------------------+-------------+------------|
| 0KB | pins 1 & 2 closed | On | On |
|-------------+-------------------+-------------+------------|
| 128KB | pins 1 & 2 closed | Off | On |
|-------------+-------------------+-------------+------------|
| 256KB | pins 1 & 2 closed | Off | On |
|-------------+-------------------+-------------+------------|
| 384KB | pins 1 & 2 closed | Off | On |
|-------------+-------------------+-------------+------------|
| 512KB | pins 1 & 2 closed | Off | On |
|-------------+-------------------+-------------+------------|
| 512KB | pins 2 & 3 closed | Off | On |
|-------------+-------------------+-------------+------------|
| 640KB | pins 1 & 2 closed | On | Off |
|-------------+-------------------+-------------+------------|
| 640KB | pins 2 & 3 closed | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE CONFIGURATION |
|------------------------------------------------------------|
| Drives installed | SW1/7 | SW1/8 |
|--------------------+-------------------+-------------------|
| 1 | On | On |
|--------------------+-------------------+-------------------|
| 2 | Off | On |
|--------------------+-------------------+-------------------|
| 3 | On | Off |
|--------------------+-------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR CONFIGURATION |
|------------------------------------------------------------|
| Type | SW1/3 | SW1/4 |
|--------------------+-------------------+-------------------|
| None | On | On |
|--------------------+-------------------+-------------------|
| 40 x 25 color | Off | On |
|--------------------+-------------------+-------------------|
| 80 x 25 color | On | Off |
|--------------------+-------------------+-------------------|
| Monochrome | Off | Off |
+------------------------------------------------------------+