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# SOYO COMPUTER CO., LTD.
SY-25 J/K/L
Processor CX486S/80486SX/CX486DX/AM486DX/SL80486DX/AM486DX2/
80486DX2/AM486DX4/80486DX4/P24D/P24T
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Video Chip None
Set
Maximum 128MB (EDO supported)
Onboard
Memory
Maximum None
Video
Memory
Cache 64/128/256KB
BIOS Award
Dimensions 254mm x 218mm
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 | Label | 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 |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP17 | Pins 1 & 2 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP27 | Pins 1 & 2 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP32 | Pins 1 & 2 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP34 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION 1 |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 256K x 9 | None | None |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 | None |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | None | None |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 256K x 36 | (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 | (1) 256K x 36 | (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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION 2 |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | None | (1) 256K x 36 | None |
|------------+---------------+---------------+---------------|
| 2MB | None | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 2MB | None | (1) 512K x 36 | None |
|------------+---------------+---------------+---------------|
| 4MB | None | (1) 512K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | None | (1) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 5MB | None | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 1M x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 6MB | None | (1) 512K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | None | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | None | (1) 2M x 36 | None |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | None | (1) 1M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | None | (1) 2M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | None | (1) 4M x 36 | None |
|------------+---------------+---------------+---------------|
| 17MB | None | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 4M x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 18MB | None | (1) 512K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | None | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 4M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | None | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | None | (1) 8M x 36 | None |
|------------+---------------+---------------+---------------|
| 36MB | (4) 4M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | None | (1) 1M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | None | (1) 4M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | None | (1) 8M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 65MB | None | (1) 256K x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 68MB | None | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 72MB | (4) 16M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | None | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (4) 16M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 128MB | None | (1) 16M x 36 | (1) 16M x 36 |
|------------------------------------------------------------|
| Note: Board also accepts x 32 SIMMs. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Configuration | 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 (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 16K/32K x 8 |
|------------+--------------+--------------+-----------------|
| 256KB (B) | (4) 64K x 8 | None | (1) 16K/32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP9 | JP10 | JP13 |
|-----------+----------------+---------------+---------------|
| 64KB | Pins 2 & 3 | Open | Pins 1 & 2 |
| | closed | | closed |
|-----------+----------------+---------------+---------------|
| 128KB | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 256KB (A) | Pins 1 & 2 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 256KB (B) | Pins 1 & 2 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP29 | JP30 | JP31 |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 40MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 75iMHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 80iMHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 100iMHz | Open | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP11 | JP12 | JP14 |
|--------------+-------+-------+----------+-------+----------|
| CX 486S | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|--------------+-------+-------+----------+-------+----------|
| 80486SX | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 2 & 3 |
|--------------+-------+-------+----------+-------+----------|
| CX 486DX | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
|--------------+-------+-------+----------+-------+----------|
| AM486DX | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 3 & 4 |
|--------------+-------+-------+----------+-------+----------|
| SL80486DX | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 3 & 4 |
|--------------+-------+-------+----------+-------+----------|
| AM486DX2 | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 3 & 4 |
|--------------+-------+-------+----------+-------+----------|
| 80486DX2 | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 3 & 4 |
|--------------+-------+-------+----------+-------+----------|
| AM486DX4 | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 3 & 4 |
|--------------+-------+-------+----------+-------+----------|
| 80486DX4 | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 3 & 4 |
|--------------+-------+-------+----------+-------+----------|
| 80486DX4 | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 3 & 4 |
| (ODP) | | | | | |
|--------------+-------+-------+----------+-------+----------|
| P24D | 1 & 2 | 1 & 2 | 1 & 2, 3 | 2 & 3 | 1 & 2, 3 |
| | | | & 4 | | & 4 |
|--------------+-------+-------+----------+-------+----------|
| P24T | 2 & 3 | 1 & 2 | 3 & 4 | 2 & 3 | 3 & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP15 | JP16 | JP18 | JP19 |
|------------------+----------+-----------+---------+--------|
| CX 486S | 2 & 3 | Open | 2 & 3 | 2 & 3 |
|------------------+----------+-----------+---------+--------|
| 80486SX | Open | Open | 2 & 3 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| CX 486DX | 2 & 3 | Open | 2 & 3 | 2 & 3 |
|------------------+----------+-----------+---------+--------|
| AM486DX | 2 & 3 | Open | 2 & 3 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| SL80486DX | 2 & 3 | Open | 2 & 3 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| AM486DX2 | 2 & 3 | Open | 2 & 3 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| 80486DX2 | 2 & 3 | Open | 2 & 3 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| AM486DX4 | 2 & 3 | Open | 2 & 3 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| 80486DX4 | 2 & 3 | Open | 2 & 3 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| 80486DX4 (ODP) | 2 & 3 | Open | 2 & 3 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| P24D | 2 & 3 | Closed | 1 & 2 | 4 & 5 |
|------------------+----------+-----------+---------+--------|
| P24T | 1 & 2 | Open | 2 & 3 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP20 | JP21 | JP22 | JP23 |
|------------------+----------+----------+----------+--------|
| CX 486S | Open | Open | 2 & 3 | 2 & 3 |
|------------------+----------+----------+----------+--------|
| 80486SX | Open | 1 & 2 | Open | Open |
|------------------+----------+----------+----------+--------|
| CX 486DX | Open | Open | 2 & 3 | 2 & 3 |
|------------------+----------+----------+----------+--------|
| AM486DX | Open | 1 & 2 | Open | Open |
|------------------+----------+----------+----------+--------|
| SL80486DX | Open | 1 & 2 | Open | Open |
|------------------+----------+----------+----------+--------|
| AM486DX2 | 2 & 3 | 1 & 2 | Open | Open |
|------------------+----------+----------+----------+--------|
| 80486DX2 | Open | 1 & 2 | Open | Open |
|------------------+----------+----------+----------+--------|
| AM486DX4 | 1 & 2 | 1 & 2 | Open | Open |
|------------------+----------+----------+----------+--------|
| 80486DX4 | Open | 1 & 2 | Open | Open |
|------------------+----------+----------+----------+--------|
| 80486DX4 (ODP) | Open | 1 & 2 | Open | Open |
|------------------+----------+----------+----------+--------|
| P24D | 1 & 2 | 2 & 3 | 1 & 2 | Open |
|------------------+----------+----------+----------+--------|
| P24T | Open | Open | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP24 |
|----------------------------+-------------------------------|
| 3.45v | Pins 3 & 5, 4 & 6 closed |
|----------------------------+-------------------------------|
| 5v | Pins 1 & 3, 2 & 4 closed |
+------------------------------------------------------------+