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# UNIDENTIFIED
HT12HS
Processor 80286
Processor Speed 12/16/20MHz
Chip Set VLSI
Max. Onboard DRAM 4MB
Cache None
BIOS AMI/Eurosoft/Quadtel
Dimensions 220mm x 220mm
I/O Options None
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| Auxiliary keyboard | JP1 | Turbo switch | JP10 |
| connector | | | |
|----------------------+----------+---------------+----------|
| External battery | JP2 | Reset switch | JP11 |
|----------------------+----------+---------------+----------|
| Speaker | JP8 | Power LED & | JP12 |
| | | keylock | |
|----------------------+----------+---------------+----------|
| Turbo LED | JP9 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| | Monitor type select color | JP3 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP3 | Open |
|---+--------------------------------+--------+--------------|
| | CMOS memory normal operation | JP4 | Closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP4 | Open |
|---+--------------------------------+--------+--------------|
| | BIOS type select 27256 | JP5 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | BIOS type select 27128 | JP5 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | NPU speed select 4.77MHz | JP6 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | NPU speed select 10.6MHz | JP6 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | P 0 | Bank 1 | P 1 | Bank | Bank |
| | | | | | 0A | 1A |
|-------+--------+--------+--------+--------+--------+-------|
| 512KB | (4) | (2) | NONE | NONE | NONE | NONE |
| | 44256 | 41256 | | | | |
|-------+--------+--------+--------+--------+--------+-------|
| 640KB | (4) | (2) | (4) | (2) | NONE | NONE |
| | 44256 | 41256 | 4464 | 4164 | | |
|-------+--------+--------+--------+--------+--------+-------|
| 1MB | (4) | (2) | (4) | (2) | NONE | NONE |
| | 44256 | 41256 | 44256 | 41256 | | |
|-------+--------+--------+--------+--------+--------+-------|
| 2MB | NONE | NONE | NONE | NONE | (2) 1M | NONE |
| | | | | | x 9 | |
|-------+--------+--------+--------+--------+--------+-------|
| 4MB | (4) | (2) | (4) | (2) | NONE | NONE |
| | 441000 | 411000 | 441000 | 411000 | | |
|-------+--------+--------+--------+--------+--------+-------|
| 4MB | NONE | NONE | NONE | NONE | (2) 1M | (2) |
| | | | | | x 9 | 1M x |
| | | | | | | 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| System clock | Bus clock | DRAM speed | JP7 |
|---------------+---------------+---------------+------------|
| 12MHz | 8MHz asynch | 100ns | Open |
|---------------+---------------+---------------+------------|
| 12MHz | 6MHz synch | 100ns | Closed |
|---------------+---------------+---------------+------------|
| 16MHz | 8MHz synch | 80ns | Closed |
|---------------+---------------+---------------+------------|
| 20MHz | 8MHz asynch | 60/70ns | Open |
|---------------+---------------+---------------+------------|
| 20MHz | 10MHz synch | 60/70ns | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note: The location of pin 1 is unidentified. |
+------------------------------------------------------------+