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# MICRO-STAR INTERNATIONAL CO., LTD.
VLB 486CT1
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium
Overdrive
Processor 20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set OPTI
Max. Onboard 32MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External keyboard | J2 | Green PC | JP38 |
|-------------------+----------+------------------+----------|
| External battery | J4 | 32 Bit VESA | S1 & S2 |
| | | slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | JP17 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP17 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP22 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP23 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP26 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP37 | pins 1 & 2 |
| | alter | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PIN OUT CONFIGURATION |
|------------------------------------------------------------|
| Function | J5 |
|----------------------------+-------------------------------|
| Keylock | pins 3 & 5 closed |
|----------------------------+-------------------------------|
| Power LED | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Speaker | pins 7 , 8 , 9 & 10 closed |
|----------------------------+-------------------------------|
| Turbo LED | pins 12 & 13 closed |
|----------------------------+-------------------------------|
| Turbo switch | pins 15, 16 & 17 closed |
|----------------------------+-------------------------------|
| Reset switch | pins 19 & 20 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 3 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 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) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M 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 | TAG |
|----------+----------------+----------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|----------+----------------+----------------+---------------|
| 128KB | (4) 32K x 8 | NONE | NONE |
|----------+----------------+----------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP6 | JP7 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 4 & 5 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP31 | JP32 | JP33 |
|-----------+--------------------+------------+--------------|
| 80486SX | pins 3 & 4 closed | Open | pins 2 & 3 , |
| | | | 4 & 5 closed |
|-----------+--------------------+------------+--------------|
| 80486SX | Open | Open | pins 1 & 2 |
| (PQFP) | | | closed |
|-----------+--------------------+------------+--------------|
| 80487SX | pins 2 & 3 , 4 & 5 | pins 1 & 2 | pins 2 & 3 , |
| | closed | closed | 4 & 5 closed |
|-----------+--------------------+------------+--------------|
| 80486DX | pins 2 & 3 , 4 & 5 | pins 2 & 3 | pins 2 & 3 , |
| | closed | closed | 4 & 5 closed |
|-----------+--------------------+------------+--------------|
| 80486DX | pins 1 & 2 closed | pins 4 & 5 | pins 1 & 2 |
| (PQFP) | | closed | closed |
|-----------+--------------------+------------+--------------|
| ODP486SX | pins 2 & 3 , 4 & 5 | pins 1 & 2 | pins 2 & 3 , |
| | closed | closed | 4 & 5 closed |
|-----------+--------------------+------------+--------------|
| 80486DX2 | pins 2 & 3 , 4 & 5 | pins 2 & 3 | pins 2 & 3 , |
| | closed | closed | 4 & 5 closed |
|-----------+--------------------+------------+--------------|
| Pentium | pins 2 & 3 , 4 & 5 | pins 1 & 2 | pins 2 & 3 , |
| Overdrive | closed | closed | 4 & 5 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | OSC. | JP8 | JP12 | JP13 | JP14 |
|-------+-------+-----------------+--------+--------+--------|
| 20MHz | 40MHz | pins 2 & 3 | Closed | Closed | Open |
| | | closed | | | |
|-------+-------+-----------------+--------+--------+--------|
| 25MHz | 25MHz | pins 2 & 3 | Open | Open | Closed |
| | | closed | | | |
|-------+-------+-----------------+--------+--------+--------|
| 33MHz | 33MHz | pins 1 & 2 | Closed | Open | Open |
| | | closed | | | |
|-------+-------+-----------------+--------+--------+--------|
| 50i | 25MHz | pins 2 & 3 | Open | Open | Closed |
| MHz | | closed | | | |
|-------+-------+-----------------+--------+--------+--------|
| 50MHz | 50MHz | pins 1 & 2 | Open | Closed | Open |
| | | closed | | | |
|-------+-------+-----------------+--------+--------+--------|
| 66i | 33MHz | pins 1 & 2 | Closed | Open | Open |
| MHz | | closed | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait states | JP19 | JP20 |
|---------------+---------------+--------------+-------------|
| £ 33MHz | 0 wait states | Open | Open |
|---------------+---------------+--------------+-------------|
| > 33MHz | 1 wait state | Closed | Closed |
+------------------------------------------------------------+