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# VISIONEX
CLT486VL2 486AT MOTHERBOARD
MSI 486VL2 486 VESA L.B. / ISA
Processor 80486SX/80487SX/ODP486/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard 32MB
Memory
Maximum Video Memory None
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Turbo LED | JP10 | External battery | JP17 |
|---------------+----------+----------------------+----------|
| Speaker | JP11 | Turbo switch | JP95 |
|---------------+----------+----------------------+----------|
| Power LED & | JP13 | 32-bit VESA local | SL1 & |
| keylock | | bus slots | SL2 |
|---------------+----------+----------------------+----------|
| Reset switch | JP15 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| | PQFP CPU disabled | JP1 | Closed |
|---+-----------------------------------+-------+------------|
| | PQFP CPU enabled | JP1 | Open |
|---+-----------------------------------+-------+------------|
| | Monitor type select | JP12 | Closed |
| | CGA/EGA/PGA/VGA | | |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | JP12 | Open |
|---+-----------------------------------+-------+------------|
| ยป | CMOS memory normal operation | JP16 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | JP16 | 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) 256K x 9 | (4) 1M 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 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M 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 | (1) 8K/32K x 8 |
|-----------+---------------+---------------+----------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP7 | JP8 |
|------------------+--------------------+--------------------|
| 64KB | Pins 2 & 3 closed | Pins 2 & 4 closed |
|------------------+--------------------+--------------------|
| 128KB | Pins 1 & 2 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 256KB | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | ID3 | JP33 | JP72 |
|------------+------------+----------------------+-----------|
| 20MHz | Open | Pins 2 & 4 closed | Closed |
|------------+------------+----------------------+-----------|
| 25MHz | Open | Pins 2 & 4 closed | Closed |
|------------+------------+----------------------+-----------|
| 33MHz | Open | Pins 2 & 4 closed | Open |
|------------+------------+----------------------+-----------|
| 50iMHz | Open | Pins 2 & 4 closed | Closed |
|------------+------------+----------------------+-----------|
| 50MHz | Closed | Pins 1 & 2 closed | Open |
|------------+------------+----------------------+-----------|
| 66iMHz | Open | Pins 2 & 4 closed | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP2 | JP3 | JP4 |
|---------------+----------------------+------------+--------|
| 80486SX | Open | Open | Open |
| (PQFP) | | | |
|---------------+----------------------+------------+--------|
| 80486SX (PGA) | Pins 2 & 3 closed | Open | Open |
|---------------+----------------------+------------+--------|
| 80487SX | Pins 1 & 2, 3 & 4 | Pins 1 & 2 | Closed |
| | closed | closed | |
|---------------+----------------------+------------+--------|
| ODP486 | Pins 1 & 2, 3 & 4 | Pins 1 & 2 | Open |
| | closed | closed | |
|---------------+----------------------+------------+--------|
| 80486DX | Pins 1 & 2, 3 & 4 | Pins 2 & 3 | Open |
| | closed | closed | |
|---------------+----------------------+------------+--------|
| 80486DX2 | Pins 1 & 2, 3 & 4 | Pins 2 & 3 | Open |
| | closed | closed | |
|------------------------------------------------------------|
| Note: The location of the PQFP is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS WAIT STATE SELECTION |
|------------------------------------------------------------|
| Setting | ID2 |
|-------------------------------+----------------------------|
| 0 | Open |
|-------------------------------+----------------------------|
| 1 | Closed |
+------------------------------------------------------------+