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# SOYO COMPUTER CO., LTD.
SY-020M
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 245mm 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP21 | JP22 | JP23 | JP24 | JP25 | JP26 | JP27 |
|-------+-------+-------+-------+-------+------+------+------|
| 64KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & | 1 & | 2 & |
| | | | | | 2 | 2 | 3 |
|-------+-------+-------+-------+-------+------+------+------|
| 128KB | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 | 2 & | 1 & | 1 & |
| | | | | | 3 | 2 | 2 |
|-------+-------+-------+-------+-------+------+------+------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & | 2 & | 2 & |
| | | | | | 3 | 3 | 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | Oscillator | JP9 | JP11 | JP12 | JP13 |
| | OSC1 | | | | |
|--------------+------------+-------+--------+-------+-------|
| 80486SX - | 40MHz | 2 & 3 | Open | 2 & 3 | 2 & 3 |
| 20MHz | | | | | |
|--------------+------------+-------+--------+-------+-------|
| 80486SX - | 25MHz | 1 & 2 | Open | 2 & 3 | 2 & 3 |
| 25MHz | | | | | |
|--------------+------------+-------+--------+-------+-------|
| 80487SX - | 40MHz | 2 & 3 | Closed | 2 & 3 | 1 & 2 |
| 20MHz | | | | | |
|--------------+------------+-------+--------+-------+-------|
| 80486DX - | 33MHz | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
| 25MHz | | | | | |
|--------------+------------+-------+--------+-------+-------|
| 80486DX - | 33MHz | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
| 33MHz | | | | | |
|--------------+------------+-------+--------+-------+-------|
| 80486DX - | 50MHz | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
| 50MHz | | | | | |
|--------------+------------+-------+--------+-------+-------|
| 80486DX2 - | 25MHz | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
| 50MHz | | | | | |
|--------------+------------+-------+--------+-------+-------|
| 80486DX2 - | 33MHz | 1 & 2 | Closed | 1 & 2 | 1 & 2 |
| 66MHz | | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+