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# YOUNG MICRO SYSTEMS, INC.
VS3486F/S-3VL
Processor 80386DX/80486DLC/80486SX/80486DX/80486DX2
Processor Speed 25/33/40/50(internal)/50/66MHz
Chip Set Symphony
Max. Onboard DRAM 32MB
Cache 64/256/1024KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 80387DX/80487SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Turbo switch | CN1 | Power LED & keylock | CN4 |
|----------------+----------+---------------------+----------|
| Turbo LED | CN2 | Speaker | CN5 |
|----------------+----------+---------------------+----------|
| Reset switch | CN3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP24 |JP25 |JP28 |JP32 |JP33 |JP34 | JP35 | JP36 |
|---------+------+-----+-----+-----+-----+-----+------+------|
| 80386DX |2 & 3 |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|Closed|Closed|
|---------+------+-----+-----+-----+-----+-----+------+------|
| 80486SX |2 & 3 |2 & 3|2 & 3|2 & 3|2 & 3|2 & 3| Open | Open |
|---------+------+-----+-----+-----+-----+-----+------+------|
|80486DLC |2 & 3 |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|Closed|Closed|
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type |JP37 |JP38 | JP39 |JP40 |JP41 |JP42 | JP43 | JP44 |
|---------+-----+-----+------+-----+-----+-----+------+------|
| 80386DX |Open |Open |Closed|Open |Open |Open | Open |1 & 2 |
|---------+-----+-----+------+-----+-----+-----+------+------|
| 80486SX |Open |Open | Open |Open |Open |Open |Closed|2 & 3 |
|---------+-----+-----+------+-----+-----+-----+------+------|
|80486DLC |Open |Open |Closed|Open |Open |Open | Open |1 & 2 |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP24 | JP25 | JP28 | JP32 | JP33 |JP34 |JP35|JP36|
|---------+------+------+------+------+------+-----+----+----|
| 25MHz |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
|---------+------+------+------+------+------+-----+----+----|
| 33MHz |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
|---------+------+------+------+------+------+-----+----+----|
| 50i MHz |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
|---------+------+------+------+------+------+-----+----+----|
| 50MHz |1 & 2 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
|---------+------+------+------+------+------+-----+----+----|
| 66i MHz |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3 |2 & 3|Open|Open|
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP37 | JP38 |JP39 | JP40 | JP41 | JP42 |JP43|JP44 |
|--------+------+------+-----+------+------+------+----+-----|
| 25MHz | Open | Open |Open |Closed|Closed|Closed|Open|2 & 3|
|--------+------+------+-----+------+------+------+----+-----|
| 33MHz | Open | Open |Open |Closed|Closed|Closed|Open|2 & 3|
|--------+------+------+-----+------+------+------+----+-----|
|50I MHz | Open | Open |Open |Closed|Closed|Closed|Open|2 & 3|
|--------+------+------+-----+------+------+------+----+-----|
| 50MHz |Closed|Closed|Open | Open |Closed|Closed|Open|2 & 3|
|--------+------+------+-----+------+------+------+----+-----|
|66I MHz | Open | Open |Open |Closed|Closed|Closed|Open|2 & 3|
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache |
|----------------------------+-------------------------------|
| 64KB | (9) 8K x 8 |
|----------------------------+-------------------------------|
| 256KB | (9) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP26 | JP27 | JP31 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+