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# SOYO TECHNOLOGY CO., LTD.
SY-027 B2/B5
Processor 80486SX/SL80486SX/CX486DX/U5/AM486DXL/80486DX/SL80486DX/
CX486DX2/AM486DX2/AM486DXL2/80486DX2/SL80486DX2/AM486DX4/ 80486DX4/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)100(internal)MHz
Speed
Chip Set Unidentified
Max. 64MB
Onboard
DRAM
Cache 128/256
BIOS Award
Dimensions 220mm x 220mm
I/O 32-bit PCI slots (4), green PC connector
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface | J1 | Turbo switch | J21 |
|-------------------+----------+------------------+----------|
| Power LED & | J17 | Turbo LED | J22 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J18 | IDE interface | JP28 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Reset switch | J19 | Green PC | JW6 |
| | | connector | |
|-------------------+----------+------------------+----------|
| External battery | J20 | 32-bit PCI slots | PCI1 - |
| | | | PCI4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|---------------------------------------+---------+----------|
| » | Factory configured - do not alter | JP32 | Closed |
|---+-----------------------------------+---------+----------|
| » | CMOS memory normal operation | JP33 | Open |
|---+-----------------------------------+---------+----------|
| | CMOS memory clear | JP33 | Closed |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | JP65 | Open |
|------------------------------------------------------------|
| Note: The location of JP32 is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (1) 512K x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (1) 512K x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 6MB | (1) 1M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 10MB | (1) 2M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 2M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 18MB | (1) 4M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (1) 4M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 8M x 36 | NONE |
|------------------+--------------------+--------------------|
| 34MB | (1) 8M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (1) 8M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (1) 8M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (1) 8M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | (1) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (4) 64K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP26 |
|----------------------------+-------------------------------|
| 128KB | Open |
|----------------------------+-------------------------------|
| 256KB | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP6 | JP9 | JP10 | JP13 | JP23 | JP24 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486SX | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| SL80486SX | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| CX486DX | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
|------------+-------+-------+-------+-------+-------+-------|
| U5 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DXL | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| SL80486DX | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| CX486DX2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DX2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX2 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DXL2 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| SL80486DX2 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| AM486DX4 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX4 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| P24D | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------+-------+-------+-------+-------+-------+-------|
| P24T | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP52 | JP53 | JP54 | JP55 | JP56 | JP57 |
|------------+-------+--------+--------+-------+------+------|
| 80486SX | Open | Open | Open | Open | Open | Open |
|------------+-------+--------+--------+-------+------+------|
| SL80486SX | Open | Open | Open | Open | 1 & | Open |
| | | | | | 2 | |
|------------+-------+--------+--------+-------+------+------|
| CX486DX | 2 & 3 | Open | Open | 1 & 2 | 1 & | 2 & |
| | | | | | 2 | 3 |
|------------+-------+--------+--------+-------+------+------|
| U5 | 3 & 4 | Open | Open | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+--------+--------+-------+------+------|
| 80486DX | Open | Open | Open | Open | Open | Open |
|------------+-------+--------+--------+-------+------+------|
| AM486DXL | 3 & 4 | Open | Open | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+--------+--------+-------+------+------|
| SL80486DX | Open | Open | Open | Open | 1 & | Open |
| | | | | | 2 | |
|------------+-------+--------+--------+-------+------+------|
| CX486DX2 | 2 & 3 | Open | Open | 1 & 2 | 1 & | 2 & |
| | | | | | 2 | 3 |
|------------+-------+--------+--------+-------+------+------|
| AM486DX2 | Open | Open | Open | Open | Open | Open |
|------------+-------+--------+--------+-------+------+------|
| 80486DX2 | Open | Open | Open | Open | Open | Open |
|------------+-------+--------+--------+-------+------+------|
| AM486DXL2 | 3 & 4 | Open | Open | Open | 2 & | Open |
| | | | | | 3 | |
|------------+-------+--------+--------+-------+------+------|
| SL80486DX2 | Open | Open | Open | Open | 1 & | Open |
| | | | | | 2 | |
|------------+-------+--------+--------+-------+------+------|
| AM486DX4 | Open | Open | Open | Open | Open | Open |
|------------+-------+--------+--------+-------+------+------|
| 80486DX4 | Open | Open | Open | Open | 1 & | Open |
| | | | | | 2 | |
|------------+-------+--------+--------+-------+------+------|
| P24D | Open | Closed | Closed | Open | 1 & | Open |
| | | | | | 2 | |
|------------+-------+--------+--------+-------+------+------|
| P24T | 1 & 2 | Open | Open | 2 & 3 | 1 & | 1 & |
| | | | | | 2 | 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP58 | JP59 | JP60 | JP62 | JP63 | JP64 |
|------------+-------+-------+--------+-------+-------+------|
| 80486SX | Open | Open | Open | Open | 2 & 3 | 1 & |
| | | | | | | 2 |
|------------+-------+-------+--------+-------+-------+------|
| SL80486SX | 1 & 2 | 2 & | Open | Open | 2 & 3 | 3 &4 |
| | | 3, 4 | | | | |
| | | & 5 | | | | |
|------------+-------+-------+--------+-------+-------+------|
| CX486DX | 2 & 3 | 1 & | Open | 3 & 4 | 1 & | 3 &4 |
| | | 2, 3 | | | 2, 3 | |
| | | & 4 | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| U5 | Open | Open | Open | 1 & | 2 & 3 | 1 & |
| | | | | 2, 3 | | 2 |
| | | | | & 4 | | |
|------------+-------+-------+--------+-------+-------+------|
| 80486DX | Open | Open | Open | 3 & 4 | 1 & | 1 & |
| | | | | | 2, 3 | 2 |
| | | | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| AM486DXL | Open | Open | Open | 1 & | 1 & | 1 & |
| | | | | 2, 3 | 2, 3 | 2 |
| | | | | & 4 | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| SL80486DX | 1 & 2 | 2 & | Open | 3 & 4 | 1 & | 3 &4 |
| | | 3, 4 | | | 2, 3 | |
| | | & 5 | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| CX486DX2 | 2 & 3 | 1 & | Open | 3 & 4 | 1 & | 3 &4 |
| | | 2, 3 | | | 2, 3 | |
| | | & 4 | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| AM486DX2 | Open | Open | Open | 3 & 4 | 1 & | 1 & |
| | | | | | 2, 3 | 2 |
| | | | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| 80486DX2 | Open | Open | Open | 3 & 4 | 1 & | 1 & |
| | | | | | 2, 3 | 2 |
| | | | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| AM486DXL2 | Open | Open | Open | 1 & | 1 & | 1 & |
| | | | | 2, 3 | 2, 3 | 2 |
| | | | | & 4 | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| SL80486DX2 | 1 & 2 | 2 & | Open | 3 & 4 | 1 & | 3 &4 |
| | | 3, 4 | | | 2, 3 | |
| | | & 5 | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| AM486DX4 | Open | Open | Open | 3 & 4 | 1 & | 1 & |
| | | | | | 2, 3 | 2 |
| | | | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| 80486DX4 | 1 & 2 | 2 & | Open | 3 & 4 | 1 & | 3 &4 |
| | | 3, 4 | | | 2, 3 | |
| | | & 5 | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| P24D | 1 & 2 | 2 & | Closed | 3 & 4 | 1 & | 3 &4 |
| | | 3, 4 | | | 2, 3 | |
| | | & 5 | | | & 4 | |
|------------+-------+-------+--------+-------+-------+------|
| P24T | 1 & 2 | 2 & | Open | 2 & 3 | 1 & | 3 & |
| | | 3, 4 | | | 2, 3 | 4, 5 |
| | | & 5 | | | & 4 | & 6 |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP22 |
|--------------------------+---------------------------------|
| 25MHz | pins 1 & 2 closed |
|--------------------------+---------------------------------|
| 33MHz | pins 1 & 2, 3 & 4, 5 & 6 closed |
|--------------------------+---------------------------------|
| 40MHz | pins 1 & 2, 3 & 4 closed |
|--------------------------+---------------------------------|
| 50iMHz | pins 1 & 2 closed |
|--------------------------+---------------------------------|
| 50MHz | pins 5 & 6 closed |
|--------------------------+---------------------------------|
| 66iMHz | pins 1 & 2, 3 & 4, 5 & 6 closed |
|--------------------------+---------------------------------|
| 75iMHz | pins 1 & 2 closed |
|--------------------------+---------------------------------|
| 80iMHz | pins 1 & 2, 3 & 4 closed |
|--------------------------+---------------------------------|
| 100iMHz | pins 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (AM486 ONLY) |
|------------------------------------------------------------|
| Speed | JP61 |
|----------------------------+-------------------------------|
| 2x | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP51 |
|----------------------------+-------------------------------|
| 2x | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 2.5x | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3x | Open |
+------------------------------------------------------------+