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# SOYO COMPUTER CO., LTD.
486 VESA MAINBOARD
Processor CX486S/80486SX/CX486S2/80487SX/CX486DX/80486DX/CX486DX2/
80486DX2/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set ALI
Max. 128MB
Onboard
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 220mm
I/O 32-bit VESA local bus slots (2)
Options
NPU None
Options
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 VESA | SL1 & |
| | | local bus slots | SL2 |
|-------------------+----------+------------------+----------|
| External battery | J20 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP19 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Battery type select internal | JP20 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | JP20 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CPU type select PGA | JP30 | Closed |
|---+----------------------------------+--------+------------|
| | CPU type select PQFP | JP30 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | JP16 | JP22 | JP23 |
|-----------+----------------+---------------+---------------|
| 64KB | N/A | N/A | N/A |
|-----------+----------------+---------------+---------------|
| 128KB | N/A | N/A | N/A |
|-----------+----------------+---------------+---------------|
| 256KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|------------------------------------------------------------|
| Note: The jumper settings for 64KB & 128KB are unavailable |
| from manufacturer. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP6 | JP7 | JP8 | JP9 | JP10 |
|-------------+------+------+-------+------+--------+--------|
| CX486S | 1 & | 2 & | 2 & 3 | 1 & | Open | Open |
| | 2 | 3 | | 2 | | |
|-------------+------+------+-------+------+--------+--------|
| 80486SX | 1 & | 1 & | Open | 1 & | Closed | Closed |
| | 2 | 2 | | 2 | | |
|-------------+------+------+-------+------+--------+--------|
| CX486S2 | 1 & | 2 & | 2 & 3 | 1 & | Open | Open |
| | 2 | 3 | | 2 | | |
|-------------+------+------+-------+------+--------+--------|
| 80487SX | 1 & | 1 & | Open | 2 & | Closed | Closed |
| | 2 | 2 | | 3 | | |
|-------------+------+------+-------+------+--------+--------|
| CX486DX | 1 & | 1 & | Open | 2 & | Closed | Closed |
| | 2 | 2 | | 3 | | |
|-------------+------+------+-------+------+--------+--------|
| CX486DX2 | 1 & | 1 & | Open | 2 & | Closed | Closed |
| | 2 | 2 | | 3 | | |
|-------------+------+------+-------+------+--------+--------|
| 80486DX/DX2 | 1 & | 1 & | Open | 2 & | Closed | Closed |
| | 2 | 2 | | 3 | | |
|-------------+------+------+-------+------+--------+--------|
| Pentium | 2 & | 2 & | 1 & 2 | 2 & | Closed | Closed |
| Overdrive | 3 | 3 | | 3 | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP11 | JP12 | JP13 | JP14 | JP17 | JP31 |
|-------------+-------+-------+-------+------+------+--------|
| CX486S | 3 & 4 | 2 & 3 | 1 & 2 | 2 & | 2 & | Open |
| | | | | 3 | 3 | |
|-------------+-------+-------+-------+------+------+--------|
| 80486SX | Open | 1 & 2 | 1 & 2 | 1 & | 1 & | Open |
| | | | | 2 | 2 | |
|-------------+-------+-------+-------+------+------+--------|
| CX486S2 | 3 & 4 | 2 & 3 | 1 & 2 | 2 & | 2 & | Closed |
| | | | | 3 | 3 | |
|-------------+-------+-------+-------+------+------+--------|
| 80487SX | 1 & 2 | 1 & 2 | 1 & 2 | 1 & | 1 & | Open |
| | | | | 2 | 2 | |
|-------------+-------+-------+-------+------+------+--------|
| CX486DX | 2 & 3 | 1 & 2 | 1 & 2 | 2 & | 1 & | Open |
| | | | | 3 | 2 | |
|-------------+-------+-------+-------+------+------+--------|
| CX486DX2 | 2 & 3 | 1 & 2 | 1 & 2 | 2 & | 1 & | Closed |
| | | | | 3 | 2 | |
|-------------+-------+-------+-------+------+------+--------|
| 80486DX/DX2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & | 1 & | Open |
| | | | | 2 | 2 | |
|-------------+-------+-------+-------+------+------+--------|
| Pentium | 1 & 2 | 1 & 2 | 2 & 3 | 1 & | 1 & | Open |
| Overdrive | | | | 2 | 2 | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP24 | JP25 | JP26 | JP27 |
|------------+-----------+-----------+-----------+-----------|
| 25MHz | Open | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 33MHz | Closed | Open | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 40MHz | Open | Closed | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 50iMHz | Open | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 50MHz | Open | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 66iMHz | Closed | Open | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP15 | JP21 | JP33 |
|--------+-----------------+----------------+----------------|
| 25MHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 33MHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 40MHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 50iMHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 50MHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 66iMHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP28 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP29 |
|----------------------------+-------------------------------|
| <= 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+