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# SOYO COMPUTER CO., LTD.
SY-025A2
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 25/33/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 220mm x 254mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Keylock | J17 | Turbo switch | J21 |
|------------------+----------+-------------------+----------|
| Speaker | J18 | Turbo LED | J22 |
|------------------+----------+-------------------+----------|
| Reset | J19 | 32-bit VESA local | S1 & S2 |
| | | bus slots (2) | |
|------------------+----------+-------------------+----------|
| External battery | J20 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor type select color | JP3 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP3 | Open |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP5 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP5 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M 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 | JP6 | JP7 |
|------------------+--------------------+--------------------|
| 64KB | pins 1 & 2 closed | open |
|------------------+--------------------+--------------------|
| 128KB | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 256KB | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP13 | JP14 | JP15 | JP16 |
|---------------+-------------+------------+--------+--------|
| 80486SX | Open | pins 2 & 3 | Open | Open |
| (PQFP) | | closed | | |
|---------------+-------------+------------+--------+--------|
| 80486SX (PGA) | Open | pins 2 & 3 | Open | Closed |
| | | closed | | |
|---------------+-------------+------------+--------+--------|
| 80487SX | pins 2 & 3 | pins 1 & 2 | Closed | Closed |
| | closed | closed | | |
|---------------+-------------+------------+--------+--------|
| 80486DX | pins 1 & 2 | pins 1 & 2 | Closed | Closed |
| | closed | closed | | |
|---------------+-------------+------------+--------+--------|
| 80486DX2 | pins 1 & 2 | pins 1 & 2 | Closed | Closed |
| | closed | closed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | OSC at | JP8 - | JP20 | JP21 | JP22 |
| | Y1 | JP11 | | | |
|----------+---------+---------+---------+---------+---------|
| 25MHZ | 25MHz | pins 1 | Closed | Open | Closed |
| | | & 2 | | | |
| | | closed | | | |
|----------+---------+---------+---------+---------+---------|
| 33MHz | 33MHz | pins 1 | Open | Closed | Closed |
| | | & 2 | | | |
| | | closed | | | |
|----------+---------+---------+---------+---------+---------|
| 50iMHZ | 25MHz | pins 1 | Closed | Open | Closed |
| | | & 2 | | | |
| | | closed | | | |
|----------+---------+---------+---------+---------+---------|
| 50MHz | 50MHz | pins 2 | Open | Closed | Open |
| | | & 3 | | | |
| | | closed | | | |
|----------+---------+---------+---------+---------+---------|
| 66iMHz | 33MHz | pins 1 | Open | Closed | Closed |
| | | & 2 | | | |
| | | closed | | | |
|------------------------------------------------------------|
| Notes:The board may come with a clock generator at Y1. |
| |
| JP8 controls VESA bus slot S1's speed, JP9 Controls VESA |
| bus slot S1's wait states. |
| |
| JP10 controls VESA bus slot S2's speed, JP11 Controls VESA |
| bus slot S2's wait states. |
+------------------------------------------------------------+