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# SOYO COMPUTER CO., LTD.
SY-021
Processor 80386DX/80486SX/80486DX
Processor Speed 25/33/40/50MHz
Chip Set Intel
Max. Onboard 32MB
DRAM
Cache 64/256KB (on CPU/Cache card)
BIOS Intel
Dimensions 330mm x 218mm
I/O Options 32-bit external CPU/Cache card slot, bus
mouse, floppy drive interface, parallel port,
serial port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| 32-bit external | CN1 | Speaker | J18 |
| CPU/Cache card | | | |
|-------------------+----------+------------------+----------|
| Bus mouse | J2 | Reset switch | J19 |
|-------------------+----------+------------------+----------|
| Serial port | J3 | External battery | J20 |
|-------------------+----------+------------------+----------|
| Parallel port | J5 | Turbo switch | J21 |
|-------------------+----------+------------------+----------|
| Floppy drive | J7 | Turbo LED | J22 |
| interface | | | |
|-------------------+----------+------------------+----------|
| Power LED & | J17 | | |
| keylock | | | |
|------------------------------------------------------------|
| Note:The Turbo switch and Turbo LED may not be present on |
| all board revisions. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Floppy drive interface select | J6 | Open |
| | 1.44MB | | |
|---+----------------------------------+--------+------------|
| | Floppy drive interface select | J6 | pins 1 & 2 |
| | 1.2MB | | closed |
|---+----------------------------------+--------+------------|
| » | Wait states select zero | J8 | Open |
|---+----------------------------------+--------+------------|
| | Wait states select one | J8 | Closed |
|---+----------------------------------+--------+------------|
| » | Posted write control enabled | J9 | Open |
|---+----------------------------------+--------+------------|
| | Posted write control disabled | J9 | Closed |
|---+----------------------------------+--------+------------|
| » | 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 |
|------------------------------------------------------------|
| Note:Jumper JP3 and JP5 may not be present on all board |
| revisions. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (4) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (4) 256K x 36 | (4) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (4) 512K x 36 | NONE |
|------------------+--------------------+--------------------|
| 12MB | (4) 512K x 36 | (4) 256K x 36 |
|------------------+--------------------+--------------------|
| 16MB | (4) 512K x 36 | (4) 512K x 36 |
|------------------+--------------------+--------------------|
| 16MB | (4) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 36 | (4) 256K x 36 |
|------------------+--------------------+--------------------|
| 24MB | (4) 1M x 36 | (4) 512K x 36 |
|------------------+--------------------+--------------------|
| 32MB | (4) 1M x 36 | (4) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (4) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 36MB | (4) 2M x 36 | (4) 256K x 36 |
|------------------+--------------------+--------------------|
| 40MB | (4) 2M x 36 | (4) 512K x 36 |
|------------------+--------------------+--------------------|
| 48MB | (4) 2M x 36 | (4) 1M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (4) 2M x 36 | (4) 2M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (4) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 68MB | (4) 4M x 36 | (4) 256K x 36 |
|------------------+--------------------+--------------------|
| 72MB | (4) 4M x 36 | (4) 512K x 36 |
|------------------+--------------------+--------------------|
| 80MB | (4) 4M x 36 | (4) 1M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (4) 4M x 36 | (4) 2M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (4) 4M x 36 | (4) 4M x 36 |
+------------------------------------------------------------+