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# SOYO COMPUTER CO., LTD.
SY-23D
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/66(internal)MHz
Chip Set ETEQ
Max. Onboard DRAM 32MB
Cache None
BIOS AMI
Dimensions 241mm x 220mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J17 | External battery | J20 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J18 | Turbo switch | J21 |
|-------------------+----------+------------------+----------|
| Reset switch | J19 | Turbo LED | J22 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+---------+------------|
| » | Monitor type select monochrome | JP3 | Open |
|----+--------------------------------+---------+------------|
| | Monitor type select color | JP3 | Closed |
|----+--------------------------------+---------+------------|
| » | CMOS memory normal operation | JP5 | pins 1 & 2 |
| | | | closed |
|----+--------------------------------+---------+------------|
| | CMOS memory clear | JP5 | pins 2 & 3 |
| | | | closed |
|----+--------------------------------+---------+------------|
| » | PGA or PQFP CPU enabled | J23 | Open |
|----+--------------------------------+---------+------------|
| | PGA CPU enabled, PQFP CPU | J23 | Closed |
| | disabled | | |
|------------------------------------------------------------|
| Note:If using the "PGA or PQFP" setting (J23 open) please |
| note that only one CPU can be installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP101 | JP102 | JP103 | JP104 |
|----------+--------+--------------+------------+------------|
| 80486SX | Open | pins 2 & 3 | open | pins 2 & 3 |
| | | closed | | closed |
|----------+--------+--------------+------------+------------|
| 80487SX | Closed | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed | closed |
|----------+--------+--------------+------------+------------|
| 80486DX | Closed | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed | closed |
|----------+--------+--------------+------------+------------|
| ODP486SX | Closed | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed | closed |
|----------+--------+--------------+------------+------------|
| 80486DX2 | Closed | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | OSC U24 | J24 | J25 | J26 |
|-----------+------------+-----------+-----------+-----------|
| 20MHz | 40MHz | Open | Closed | Closed |
|-----------+------------+-----------+-----------+-----------|
| 25MHz | 50MHz | Closed | Open | Closed |
|-----------+------------+-----------+-----------+-----------|
| 33MHz | 66.67MHz | Closed | Closed | Open |
|-----------+------------+-----------+-----------+-----------|
| 50iMHz | 50MHz | Closed | Open | Closed |
|-----------+------------+-----------+-----------+-----------|
| 66iMHz | 66.67MHz | Closed | Closed | Open |
|------------------------------------------------------------|
| Note:The location of socket U24 is unknown. |
+------------------------------------------------------------+