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# SOYO COMPUTER CO., LTD.
SY-020C/D
Processor 80486SX/80486DX
Speed 20/25/33/50MHz
Chip Set ETEQ
Max. Onboard DRAM 32MB
SRAM Cache 64/256KB
BIOS AMI
Dimensions 325mm x 220mm
I/O Options 32-bit external memory card slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J17 | Turbo switch | J21 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J18 | Turbo LED | J22 |
|-------------------+----------+------------------+----------|
| Reset switch | J19 | 32-Bit external | S1 |
| | | memory card | |
|-------------------+----------+------------------+----------|
| External battery | J20 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE JUMPERS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP2 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP3 | pins 1 & 2 |
| | | | 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 | Bank 2 | Bank 3 |
|--------+----------------+------------+----------+----------|
| 1MB | (4) 256K x 9 | NONE | NONE | NONE |
|--------+----------------+------------+----------+----------|
| 2MB | (4) 256K x 9 | (4) 256K x | NONE | NONE |
| | | 9 | | |
|--------+----------------+------------+----------+----------|
| 3MB | (4) 256K x 9 | (4) 256K x | (4) 256K | NONE |
| | | 9 | x 9 | |
|--------+----------------+------------+----------+----------|
| 4MB | (4) 256K x 9 | (4) 256K x | (4) 256K | (4) 256K |
| | | 9 | x 9 | x 9 |
|--------+----------------+------------+----------+----------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|--------+----------------+------------+----------+----------|
| 5MB | (4) 1M x 9 | (4) 256K x | NONE | NONE |
| | | 9 | | |
|--------+----------------+------------+----------+----------|
| 6MB | (4) 256K x 9 | (4) 256K x | (4) 1M x | NONE |
| | | 9 | 9 | |
|--------+----------------+------------+----------+----------|
| 7MB | (4) 256K x 9 | (4) 256K x | (4) 256K | (4) 1M x |
| | | 9 | x 9 | 9 |
|--------+----------------+------------+----------+----------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|--------+----------------+------------+----------+----------|
| 9MB | (4) 1M x 9 | (4) 1M x 9 | (4) 256K | NONE |
| | | | x 9 | |
|--------+----------------+------------+----------+----------|
| 10MB | (4) 256K x 9 | (4) 256K x | (4) 1M x | (4) 1M x |
| | | 9 | 9 | 9 |
|--------+----------------+------------+----------+----------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x | NONE |
| | | | 9 | |
|--------+----------------+------------+----------+----------|
| 13MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x | (4) 256K |
| | | | 9 | x 9 |
|--------+----------------+------------+----------+----------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x | (4) 1M x |
| | | | 9 | 9 |
|--------+----------------+------------+----------+----------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|--------+----------------+------------+----------+----------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|--------+----------------+------------+----------+----------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x | NONE |
| | | | 9 | |
|--------+----------------+------------+----------+----------|
| 28MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x | (4) 4M x |
| | | | 9 | 9 |
|--------+----------------+------------+----------+----------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|--------+----------------+------------+----------+----------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x | NONE |
| | | | 9 | |
|--------+----------------+------------+----------+----------|
| 37MB | (4) 256K x 9 | (4) 1M x 9 | (4) 4M x | (4) 4M x |
| | | | 9 | 9 |
|--------+----------------+------------+----------+----------|
| 40MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x | (4) 4M x |
| | | | 9 | 9 |
|--------+----------------+------------+----------+----------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x | NONE |
| | | | 9 | |
|--------+----------------+------------+----------+----------|
| 49MB | (4) 256K x 9 | (4) 4M x 9 | (4) 4M x | (4) 4M x |
| | | | 9 | 9 |
|--------+----------------+------------+----------+----------|
| 52MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x | (4) 4M x |
| | | | 9 | 9 |
|--------+----------------+------------+----------+----------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x | (4) 4M x |
| | | | 9 | 9 |
|------------------------------------------------------------|
| Note:Banks 2 & 3 are used when a 32-bit external memory |
| card is installed at S1. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | (2) 16K x 4 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (2) 16K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP15 | JP16 | JP17 | JP18 | JP33 |
|----------+----------+----------+--------+--------+---------|
| 64KB | Open | Open | 2 & 3 | 2 & 3 | Open |
|----------+----------+----------+--------+--------+---------|
| 256KB | Closed | Closed | 1 & 2 | 1 & 2 | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP103 | JP104 | JP106 |
|----------+-------------------+-------------------+---------|
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed | Closed |
|----------+-------------------+-------------------+---------|
| 80486SX | pins 1 & 2 closed | pins 1 & 2 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU | Oscillator | Oscillator | JP13 | JP23 |
| Speed | U18 | U22 | | |
|--------+------------+------------+-------------+-----------|
| 20MHz | 40MHz | N/A | pins 1 & 2 | pins 1 & |
| | | | closed | 2 closed |
|--------+------------+------------+-------------+-----------|
| 25MHz | N/A | 50MHz | pins 2 & 3 | pins 1 & |
| | | | closed | 2 closed |
|--------+------------+------------+-------------+-----------|
| 33MHz | N/A | 66MHz | pins 2 & 3 | pins 1 & |
| | | | closed | 2 closed |
|--------+------------+------------+-------------+-----------|
| 50MHz | N/A | 50MHz | pins 2 & 3 | pins 2 & |
| | | | closed | 3 closed |
+------------------------------------------------------------+