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# SOYO COMPUTER CO., LTD.
SY-024B1/B2
Processor 80386DX/CX486DLC/80486SX/80486DX/ODP486SX/80486DX2
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set OPTI
Max. 32MB
Onboard
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options None
NPU Options 80387
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J17 | External battery | J20 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J18 | Turbo switch | J21 |
|-------------------+----------+------------------+----------|
| Reset switch | J19 | Turbo LED | J22 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| ยป | Monitor type select monochrome | JP3 | Open |
|---+----------------------------------+---------+-----------|
| | Monitor type select color | JP3 | 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG (U22) | TAG (U23) |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 32K x | NONE |
| | | 8 | 8 | |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 8K x 8 | (1) 8K x 8 |
| | | 8 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP6 | JP7 | JP8 | JP9 | JP10 |
|-------+--------+--------+--------+--------+--------+-------|
| 64KB | Open | Open | Open | Open | Open | 2 & 3 |
|-------+--------+--------+--------+--------+--------+-------|
| 128KB | Closed | Closed | Closed | Open | Open | 1 & 2 |
|-------+--------+--------+--------+--------+--------+-------|
| 256KB | Closed | Closed | Closed | Closed | Closed | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+-------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|-------------------------------------------------------------|
| Type | JP4 |JP11| JP12 |JP13| JP14 |JP15|JP16|JP18| JP31 |
|--------+------+----+------+----+------+----+----+----+------|
|80386DX |Closed|1 & | Open |2 & | N/A |N/A |N/A |2 & |Closed|
| | | 2 | | 3 | | | | 3 | |
|--------+------+----+------+----+------+----+----+----+------|
|CX486DLC|Closed|1 & |Closed|2 & | N/A |N/A |N/A |2 & |Closed|
| | | 2 | | 3 | | | | 3 | |
|--------+------+----+------+----+------+----+----+----+------|
|80486SX | N/A |2 & | N/A |1 & | Open |N/A |2 & |1 & | Open |
| | | 3 | | 2 | | | 3 | 2 | |
|--------+------+----+------+----+------+----+----+----+------|
|80486DX | N/A |2 & | N/A |1 & |Closed|2 & |1 & |1 & | Open |
| | | 3 | | 2 | | 3 | 2 | 2 | |
|--------+------+----+------+----+------+----+----+----+------|
|ODP486SX| N/A |2 & | N/A |1 & | Open |N/A |1 & |1 & | Open |
| | | 3 | | 2 | | | 2 | 2 | |
|--------+------+----+------+----+------+----+----+----+------|
|80486DX2| N/A |2 & | N/A |1 & |Closed|2 & |1 & |1 & | Open |
| | | 3 | | 2 | | 3 | 2 | 2 | |
|-------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+-------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP24 | JP25 | JP26 | JP27 |
|----------+------------+------------+-----------+-----------|
| 25MHz | Closed | Open | Closed | Open |
|----------+------------+------------+-----------+-----------|
| 33MHz | Closed | Closed | Open | Open |
|----------+------------+------------+-----------+-----------|
| 40MHz | Open | Open | Closed | Closed |
|----------+------------+------------+-----------+-----------|
| 50iMHz | Closed | Open | Closed | Open |
|----------+------------+------------+-----------+-----------|
| 50MHz | Closed | Open | Closed | Closed |
|----------+------------+------------+-----------+-----------|
| 66iMHz | Closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK SOURCE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP17 | JP19 |
|--------------------+-------------------+-------------------|
| AV9107-03 | Open | Closed |
|--------------------+-------------------+-------------------|
| Oscillator | pins 1 & 2 closed | pins 2 & 3 closed |
| installed at OSC1 | | |
+------------------------------------------------------------+