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# YOUNG MICRO SYSTEMS, INC.
VS486F/S-3VL
Processor 80486SX/80486DX/80486DX2
Processor Speed 25/33/40/50(internal)/66(internal)MHz
Chip Set Symphony
Max. Onboard DRAM 64MB
Cache 64/256/1024KB
BIOS AMI
Dimensions 230mm x 218mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | J1 | Turbo switch | JP24 |
|-------------------+----------+------------------+----------|
| Power LED & | JP20 | 32-bit VESA | S1 |
| keylock | | Local bus slot | |
|-------------------+----------+------------------+----------|
| Speaker | JP21 | 32-bit VESA | S2 |
| | | Local bus slot | |
|-------------------+----------+------------------+----------|
| Reset switch | JP22 | 32-bit VESA | S3 |
| | | Local bus slot | |
|-------------------+----------+------------------+----------|
| Turbo LED | JP23 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J2 | Unknown |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Flash BIOS write protect enabled | JP2 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Flash BIOS write protect | JP2 | pins 2 & 3 |
| | disabled | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | Unknown |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
|Speed | JA1 | JP4 | JP5 | JP6 | JP7 | JP10 | JP11 |
|------+--------+-------+------+------+------+-------+-------|
|25MHz |pins 2 &|pins 2 | Open |Closed|Closed|pins 1 |pins 2 |
| | 3 | & 3 | | | | & 2 | & 3 |
|------+--------+-------+------+------+------+-------+-------|
|33MHz |pins 2 &|pins 2 |Closed| Open |Closed|pins 1 |pins 2 |
| | 3 | & 3 | | | | & 2 | & 3 |
|------+--------+-------+------+------+------+-------+-------|
| 50I |pins 1 &|pins 1 | Open |Closed|Closed|pins 1 |pins 1 |
| MHz | 2 | & 2 | | | | & 2 | & 2 |
|------+--------+-------+------+------+------+-------+-------|
| 66I |pins 2 &|pins 2 |Closed| Open |Closed|pins 1 |pins 2 |
| MHz | 3 | & 3 | | | | & 2 | & 3 |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP12 | JP13 | JP14 |JP15| JP16 | JP17 | JP18 |JP30|
|-------+-------+------+------+----+------+------+------+----|
| 25MHz |Closed | Open |Closed|Open| Open |Closed| Open |Open|
|-------+-------+------+------+----+------+------+------+----|
| 33MHz |Closed | Open |Closed|Open| Open |Closed| Open |Open|
|-------+-------+------+------+----+------+------+------+----|
|50I MHz|Closed |Closed| Open |Open|Closed|Closed|Closed|Open|
|-------+-------+------+------+----+------+------+------+----|
|66I MHz|Closed |Closed| Open |Open|Closed|Closed|Closed|Open|
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Max Cachable | Cache | TAG |
|------------+---------------+---------------+---------------|
| 64KB | 8MB | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | 32MB | (4) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | 64MB | (4) 128K x 8 | (1) 128K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP19 | JP25 | JP26 |
|-------+------------+----------+----------+--------+--------|
| 64KB | pins 2 & 3 | pins 1 & | pins 1 & | pins 1 | pins 1 |
| | | 2 | 2 | & 2 | & 2 |
|-------+------------+----------+----------+--------+--------|
| 256KB | pins 2 & 3 | pins 1 & | pins 2 & | pins 2 | pins 2 |
| | | 2 | 3 | & 3 | & 3 |
|-------+------------+----------+----------+--------+--------|
| 1MB | pins 1 & 2 | pins 2 & | pins 2 & | pins 2 | pins 2 |
| | | 3 | 3 | & 3 | & 3 |
+------------------------------------------------------------+