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# SOYO COMPUTER CO., LTD.
SY-24A
Processor 80386DX/80486SX/80486DX/80486DX2
Processor Speed 25/33/40/50(internal)/50/66(internal)MHz
Chip Set CONTAQ
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 217mm
I/O Options None
NPU Options 80387/3167
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 |
|------------------------------------+--------+--------------|
| » | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 2OMB | (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 (U28) | Dirty Bit |
| | | | | (U44) |
|---------+-----------+-----------+-----------+--------------|
| 64KB | (4) 8K x | (4) 8K x | (1) 8K x | (1) 16K x 4 |
| | 8 | 8 | 8 | |
|---------+-----------+-----------+-----------+--------------|
| 256KB | (4) 32K x | (4) 32K x | (1) 32K x | (1) 16K x 4 |
| | 8 | 8 | 8 | |
|------------------------------------------------------------|
| Note:Dirty bit need only be filled if writeback mode is |
| selected in the CMOS-advanced chipset setup. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP30 | JP31 | JP32 | JP33 | JP34 | JP35 |
|--------+--------+--------+--------+--------+-------+-------|
| 64KB | Open | Open | Open | Open | Open | 2 & 3 |
|--------+--------+--------+--------+--------+-------+-------|
| 256KB | Closed | Closed | Closed | Closed | 1 & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type |JP36 |JP37 |JP38 |JP39 |JP40 |JP41 |JP42 |JP43|JP44|
|--------+-----+-----+-----+-----+-----+-----+-----+----+----|
|80386DX |2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & |2 & |
| | | | | | | | | 3 | 3 |
|--------+-----+-----+-----+-----+-----+-----+-----+----+----|
|80486SX |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & |1 & |
| | | | | | | | | 2 | 2 |
|--------+-----+-----+-----+-----+-----+-----+-----+----+----|
|80486DX |1 & 2|1 & 2|1 & 2|1 & 2|2 & 3|2 & 3|2 & 3|2 & |1 & |
| | | | | | | | | 3 | 2 |
|--------+-----+-----+-----+-----+-----+-----+-----+----+----|
|80486DX2|1 & 2|1 & 2|1 & 2|1 & 2|2 & 3|2 & 3|2 & 3|2 & |1 & |
| | | | | | | | | 3 | 2 |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | OSC2 | JP8 | JP13 | JP14 |
|-----------+-----------+------------------+--------+--------|
| 25/50iMHz | 25MHz | pins 1 & 2 | Open | Closed |
| | | closed | | |
|-----------+-----------+------------------+--------+--------|
| 25/50iMHz | 50MHz | pins 2 & 3 | Open | Closed |
| | | closed | | |
|-----------+-----------+------------------+--------+--------|
| 33/66iMHz | 33.33MHz | pins 1 & 2 | Closed | Open |
| | | closed | | |
|-----------+-----------+------------------+--------+--------|
| 33/66iMHz | 66.667MHz | pins 2 & 3 | Closed | Open |
| | | closed | | |
|-----------+-----------+------------------+--------+--------|
| 40MHz | 40MHz | pins 1 & 2 | Open | Open |
| | | closed | | |
|-----------+-----------+------------------+--------+--------|
| 40MHz | 80MHz | pins 2 & 3 | Open | Open |
| | | closed | | |
|-----------+-----------+------------------+--------+--------|
| 50MHz | 50MHz | pins 1 & 2 | Closed | Closed |
| | | closed | | |
+------------------------------------------------------------+