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# YOUNG MICRO SYSTEMS, INC.
VS3486F (REV. 2.0)
Processor 80386DX/80486SX/80487SX/CX486DLC/80486DX/80486DX2
Processor 25/33/50(internal)/50/66(internal)MHz
Speed
Chip Set Symphony
Video Chip None
Set
Maximum 32MB
Onboard
Memory
Maximum None
Video Memory
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 80387DX/4167
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Turbo switch | J1 | Power LED & keylock | J4 |
|----------------+----------+---------------------+----------|
| Turbo LED | J2 | Speaker | J5 |
|----------------+----------+---------------------+----------|
| Reset switch | J3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| ยป | Factory configured - do not | JP1 | Unidentified |
| | 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) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 |
|------------------------------------------------------------|
| Note: The location of banks 0 & 1 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP26 | JP27 | JP31 |
|-------+-----------------+-----------------+----------------|
| 64KB | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP24 | JP25 | JP28 | JP32 |
|-----------------+----------+----------+----------+---------|
| 80368DX | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|-----------------+----------+----------+----------+---------|
| CX486DLC | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|-----------------+----------+----------+----------+---------|
| 80486SX | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|-----------------+----------+----------+----------+---------|
| 80486DX-25/33 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|-----------------+----------+----------+----------+---------|
| 80486DX-50 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|-----------------+----------+----------+----------+---------|
| 80486DX2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP33 | JP34 | JP35 | JP36 | JP37 | JP38 |
|--------------+-------+------+-------+-------+-------+------|
| 80368DX | 2 & 3 |2 & 3 |Closed |Closed | Open | Open |
|--------------+-------+------+-------+-------+-------+------|
| CX486DLC | 2 & 3 |2 & 3 |Closed |Closed | Open | Open |
|--------------+-------+------+-------+-------+-------+------|
| 80486SX | 1 & 2 |1 & 2 | Open | Open | Open | Open |
|--------------+-------+------+-------+-------+-------+------|
|80486DX-25/33 | 1 & 2 |1 & 2 | Open | Open | Open | Open |
|--------------+-------+------+-------+-------+-------+------|
| 80486DX-50 | 1 & 2 |1 & 2 | Open | Open |Closed |Closed|
|--------------+-------+------+-------+-------+-------+------|
| 80486DX2 | 1 & 2 |1 & 2 | Open | Open | Open | Open |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP39 | JP40 | JP41 | JP42 | JP43 |JP44 |
|--------------+-------+-------+-------+-------+-------+-----|
| 80368DX |Closed | Open | Open | Open | Open |2 & 3|
|--------------+-------+-------+-------+-------+-------+-----|
| CX486DLC |Closed | Open | Open | Open | Open |2 & 3|
|--------------+-------+-------+-------+-------+-------+-----|
| 80486SX | Open | Open | Open | Open |Closed |1 & 2|
|--------------+-------+-------+-------+-------+-------+-----|
|80486DX-25/33 | Open |Closed |Closed |Closed | Open |1 & 2|
|--------------+-------+-------+-------+-------+-------+-----|
| 80486DX-50 | Open |Closed |Closed |Closed | Open |1 & 2|
|--------------+-------+-------+-------+-------+-------+-----|
| 80486DX2 | Open |Closed |Closed |Closed | Open |1 & 2|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+