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# SOYO COMPUTER CO., LTD.
486VESA VER. 4.2
Processor CX486M6/CX486M7/80486SX/80486DX/80486DX280486DX4/P24D/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Max. 128MB
Onboard
DRAM
Cache 64/128/256KB
BIOS Award
Dimensions 254mm x 220mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Power LED & | J17 | Turbo LED | J22 |
| keylock | | | |
|------------------+----------+-------------------+----------|
| Speaker | J18 | Green PC | JP4 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Reset switch | J19 | Green PC | JP6 |
| | | connector | |
|------------------+----------+-------------------+----------|
| External battery | J20 | Green PC | JP7 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Turbo switch | J21 | 32-bit VESA local | SL1 - |
| | | bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | JP17 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP27 | Closed |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (SETTING 1) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 256K x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (4) 256K x 9 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (4) 256K x 9 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (4) 1M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (4) 16M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 65MB | (4) 256K x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 68MB | (4) 1M x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 72MB | (4) 1M x 9 | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (4) 4M x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 96MB | (4) 4M x 9 | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 128MB | (4) 16M x 9 | (1) 16M x 36 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (SETTING 2) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (1) 256K x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (1) 256K x 36 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (1) 512K x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 4MB | (1) 512K x 36 | (1) 512K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | (1) 1M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 6MB | (1) 256K x 36 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (SETTING 2 CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 8MB | (1) 2M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | (1) 1M x 36 | (1) 2M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 16MB | (1) 4M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (1) 256K x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 18MB | (1) 256K x 36 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (1) 512K x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 32MB | (1) 8M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 36MB | (1) 1M x 36 | (1) 4M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 36MB | (1) 1M x 36 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 36 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 64MB | (1) 16M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 65MB | (1) 256K x 36 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 68MB | (1) 1M x 36 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 72MB | (1) 1M x 36 | (1) 1M x 36 | (4) 16M x 9 |
|------------+---------------+---------------+---------------|
| 80MB | (1) 4M x 36 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 96MB | (1) 4M x 36 | (1) 4M x 36 | (4) 16M x 9 |
|------------+---------------+---------------+---------------|
| 128MB | (1) 16M x 36 | (1) 16M x 36 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP35 | JP36 | JP37 |
|---------+----------------+----------------+----------------|
| 1 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 16K x 8 or (1) 32K |
| | | | x 8 |
|-------+-------------+-------------+------------------------|
| 256KB | (4) 64K x 8 | NONE | (1) 16K x 8 or (1) 32K |
| | | | x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP9 | JP10 | JP13 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP12 | JP14 | JP15 | JP16 |
|----------+-------+-------+-------+--------+-------+--------|
| CX486 | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | Open | Open |
| (M6) | | | | | | |
|----------+-------+-------+-------+--------+-------+--------|
| CX486 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2, | 2 & 3 | Open |
| (M7) | | | | 3 & 4 | | |
|----------+-------+-------+-------+--------+-------+--------|
| 80486SX | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 | Open | Open |
|----------+-------+-------+-------+--------+-------+--------|
| 80486DX | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2, | 2 & 3 | Open |
| | | | | 3 & 4 | | |
|----------+-------+-------+-------+--------+-------+--------|
| 80486DX2 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2, | 2 & 3 | Open |
| | | | | 3 & 4 | | |
|----------+-------+-------+-------+--------+-------+--------|
| P24D | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2, | 2 & 3 | Closed |
| | | | | 3 & 4 | | |
|----------+-------+-------+-------+--------+-------+--------|
| 80486DX4 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2, | 2 & 3 | Open |
| | | | | 3 & 4 | | |
|----------+-------+-------+-------+--------+-------+--------|
| P24T | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2, | 1 & 2 | Open |
| | | | | 3 & 4 | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type |JP18 |JP19 | JP20 |JP21 |JP22 |JP23 | JP111 |
|----------+-----+-----+------+-----+-----+-----+------------|
|CX486 (M6)|2 & 3|2 & 3| Open |Open |2 & 3|2 & 3| 2 & 3 |
|----------+-----+-----+------+-----+-----+-----+------------|
|CX486 (M7)|2 & 3|2 & 3| Open |Open |2 & 3|2 & 3| 2 & 3 |
|----------+-----+-----+------+-----+-----+-----+------------|
| 80486SX |2 & 3|4 & 5| Open |1 & 2|Open |Open | 3 & 4 |
|----------+-----+-----+------+-----+-----+-----+------------|
| 80486DX |2 & 3|4 & 5| Open |1 & 2|Open |Open | 3 & 4 |
|----------+-----+-----+------+-----+-----+-----+------------|
| 80486DX2 |2 & 3|4 & 5| Open |1 & 2|Open |Open | 3 & 4 |
|----------+-----+-----+------+-----+-----+-----+------------|
| P24D |1 & 2|4 & 5|Closed|2 & 3|1 & 2|Open |1 & 2, 3 & 4|
|----------+-----+-----+------+-----+-----+-----+------------|
| 80486DX4 |2 & 3|Open | Open |1 & 2|Open |Open | 3 & 4 |
|----------+-----+-----+------+-----+-----+-----+------------|
| P24T |1 & 2|1 & 2| Open |Open |1 & 2|1 & 2| 3 & 4 |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP29 | JP30 | JP31 | JP34 |
|------------+-----------+-----------+-----------+-----------|
| 25MHz | Closed | Open | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 33MHz | Open | Closed | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 40MHz | Closed | Open | Open | Closed |
|------------+-----------+-----------+-----------+-----------|
| 50iMHz | Closed | Open | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 50MHz | Open | Closed | Open | Closed |
|------------+-----------+-----------+-----------+-----------|
| 66iMHz | Open | Closed | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 75iMHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 100iMHz | Open | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP24 |
|----------------------------+-------------------------------|
| 3.3v | pins 1 & 2, 4 & 5 closed |
|----------------------------+-------------------------------|
| 5.0v | pins 2 & 3, 5 & 6 closed |
+------------------------------------------------------------+