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# SOYO COMPUTER CO., LTD.
486 VESA GREEN MAINBOARD
Processor CX486S/80486SX/CX486DX/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set Unidentified
Max. Onboard 128MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 220mm
I/O Options 32-bit VESA local bus slots (2), green PC
connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Green PC | J4 | Turbo switch | J21 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Power LED & | J17 | Turbo LED | J22 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J18 | Green PC | JP28 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Reset switch | J19 | Green PC | JP34 |
| | | connector | |
|-------------------+----------+------------------+----------|
| External battery | J20 | 32-bit VESA | SL1 & |
| | | local bus slots | SL2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | JP3 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select | JP3 | Closed |
| | color/EGA/VGA | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP5 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP5 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CPU type select PGA | JP18 | Closed |
|---+----------------------------------+--------+------------|
| | CPU type select PQFP | JP18 | Open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP23 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP31 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP32 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP35 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP36 | Open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 68MB | (4) 1M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 80MB | (4) 4M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M 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 | JP24 | JP25 | JP26 |
|-------+-----------------+-----------------+----------------|
| 64KB | Open | pins 1 & 2 | Open |
| | | closed | |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP4 | JP6 | JP8 | JP9 |
|----------------+--------+--------+--------+--------+-------|
| CX486SX | 1 & 2 | 2 & 3 | Open | Open | 2 & 3 |
|----------------+--------+--------+--------+--------+-------|
| 80486SX | 2 & 3 | 1 & 2 | Closed | Open | 2 & 3 |
|----------------+--------+--------+--------+--------+-------|
| CX486DX | 1 & 2 | 2 & 3 | Open | Closed | 1 & 2 |
|----------------+--------+--------+--------+--------+-------|
| 80486DX | 2 & 3 | 1 & 2 | Closed | Closed | 1 & 2 |
|----------------+--------+--------+--------+--------+-------|
| 80486DX2 | 2 & 3 | 1 & 2 | Closed | Closed | 1 & 2 |
|----------------+--------+--------+--------+--------+-------|
| Pentium | 1 & 2 | 1 & 2 | Open | Closed | 1 & 2 |
| Overdrive | | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP10 | JP11 | JP12 | JP13 |
|---------------------+---------+---------+---------+--------|
| CX486SX | 2 & 3 | 2 & 3 | 2 & 3 | Open |
|---------------------+---------+---------+---------+--------|
| 80486SX | 4 & 5 | Open | Open | Open |
|---------------------+---------+---------+---------+--------|
| CX486DX | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|---------------------+---------+---------+---------+--------|
| 80486DX | 4 & 5 | Open | Open | Open |
|---------------------+---------+---------+---------+--------|
| 80486DX2 | 4 & 5 | Open | Open | Open |
|---------------------+---------+---------+---------+--------|
| Pentium Overdrive | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP16 | JP17 | JP29 | JP33 |
|----------------+--------------+------------+-------+-------|
| CX486SX | 1 & 2, 3 & 4 | 1 & 2, 3 & | 2 & 3 | 2 & 3 |
| | | 4 | | |
|----------------+--------------+------------+-------+-------|
| 80486SX | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 |
|----------------+--------------+------------+-------+-------|
| CX486DX | 1 & 2, 3 & 4 | 1 & 2, 3 & | 1 & 2 | 2 & 3 |
| | | 4 | | |
|----------------+--------------+------------+-------+-------|
| 80486DX | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 |
|----------------+--------------+------------+-------+-------|
| 80486DX2 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 |
|----------------+--------------+------------+-------+-------|
| Pentium | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
| Overdrive | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP20 | JP21 | JP22 |
|--------------------------------+---------+--------+--------|
| 25MHz | Closed | Open | Closed |
|--------------------------------+---------+--------+--------|
| 33MHz | Open | Closed | Closed |
|--------------------------------+---------+--------+--------|
| 40MHz | Closed | Open | Open |
|--------------------------------+---------+--------+--------|
| 50MHz | Open | Closed | Open |
|--------------------------------+---------+--------+--------|
| 50MHz (Pentium Overdrive only) | Closed | Open | Closed |
|--------------------------------+---------+--------+--------|
| 50iMHz | Closed | Open | Closed |
|--------------------------------+---------+--------+--------|
| 66iMHz | Open | Closed | Closed |
+------------------------------------------------------------+