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# MYLEX CORPORATION
MVI486 & MVI486LC
Processor 80486SX/80487SX/80486DX
Processor 20/25/33MHz
Speed
Chip Set OPTI
Max. Onboard 32MB
DRAM
Cache 64/128/256KB
BIOS MYLEX
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2), floppy drive
interface,
IDE interface, parallel port, serial ports (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| 32-bit VESA | J90 | IDE interface LED | JP7 |
| Local bus slot | | | |
|------------------+----------+-------------------+----------|
| 32-bit VESA | J91 | External battery | JP31 |
| Local bus slot | | | |
|------------------+----------+-------------------+----------|
| Reset switch | JP2 | Floppy drive | P1 |
| | | interface | |
|------------------+----------+-------------------+----------|
| Speaker | JP3 | IDE port | P2 |
|------------------+----------+-------------------+----------|
| Power LED & | JP4 | Serial port 2 | P3 |
| keylock | | | |
|------------------+----------+-------------------+----------|
| Turbo LED | JP5 | Serial port 1 | P4 |
|------------------+----------+-------------------+----------|
| Turbo switch | JP6 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | JP1 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP1 | Closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory clear | JP30 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory normal operation | JP30 | Open |
| | (External battery) | | |
|---+----------------------------------+--------+------------|
| | CMOS memory normal operation | JP30 | pins 2 & 3 |
| | (Internal battery) | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (1) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (1) 1M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (1) 1M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 10MB | (1) 2M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 2M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 18MB | (1) 4M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (1) 4M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (1) 8M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG/U15 | TAG/U16 | TAG/U17 |
|-------+---------+---------+----------+----------+----------|
| 64KB | (4) 8K | (4) 8K | NONE | (1) 8K x | (1) 64K |
| | x 8 | x 8 | | 8 | x 8 |
|-------+---------+---------+----------+----------+----------|
| 128KB | (4) 32K | NONE | NONE | (1) 8K x | (1) 64K |
| | x 8 | | | 8 | x 8 |
|-------+---------+---------+----------+----------+----------|
| 256KB | (4) 32K | (4) 32K | (1) 8K x | (1) 8K x | (1) 64K |
| | x 8 | x 8 | 8 | 8 | x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP14 | JP15 | JP16 | JP17 | JP18 | JP19 |
|-------+--------+-------+--------+--------+--------+--------|
| 64KB | pins 2 | pins | Open | Open | Open | Open |
| | & 3 | 2 & 3 | | | | |
|-------+--------+-------+--------+--------+--------+--------|
| 128KB | pins 1 | pins | Closed | Closed | Open | Open |
| | & 2 | 1 & 2 | | | | |
|-------+--------+-------+--------+--------+--------+--------|
| 256KB | pins 2 | pins | Closed | Closed | Closed | Closed |
| | & 3 | 2 & 3 | | | | |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP25 | JP26 | JP27 |
|----------+-------------------+-------------------+---------|
| 80486SX | Open | pins 2 & 3 closed | Open |
|----------+-------------------+-------------------+---------|
| 80487SX | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
|----------+-------------------+-------------------+---------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP8 | JP9 | JP10 |
|-------+-----------------+-----------------+----------------|
| 20MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 25MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 33MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT OUTPUT SELECTION |
|------------------------------------------------------------|
| Setting | JP28 | JP29 |
|-------------------------------+--------------+-------------|
| » | Uni-directional (printer) | Closed | Closed |
|---+---------------------------+--------------+-------------|
| | Bi-directional | Open | Open |
+------------------------------------------------------------+