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# MYLEX CORPORATION
MDE486
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set OPTI
Max. Onboard 128MB
DRAM
Cache 64/128/256/512KB
BIOS Mylex
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card slot, floppy
interface, IDE interface, parallel port,
serial ports (2)
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| 32-bit external | CN1 | Reset switch | P2 |
| memory card | | | |
|----------------------+----------+---------------+----------|
| Serial port 1 | CN2 | Speaker | P3 |
|----------------------+----------+---------------+----------|
| Serial port 2 | CN3 | Power LED & | P4 |
| | | keylock | |
|----------------------+----------+---------------+----------|
| Parallel port | CN4 | Turbo LED | P5 |
|----------------------+----------+---------------+----------|
| IDE interface | CN5 | IDE interface | P6 |
| | | LED | |
|----------------------+----------+---------------+----------|
| Floppy drive | CN6 | | |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J11 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J12 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J20 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J21 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | P1 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | P1 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|---------+--------------+-------------+----------+----------|
| 4MB | (4) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|---------+--------------+-------------+----------+----------|
| 8MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 36 | 36 | | |
|---------+--------------+-------------+----------+----------|
| 12MB | (4) 256K x | (4) 256K x | (4) 256K | NONE |
| | 36 | 36 | x 36 | |
|---------+--------------+-------------+----------+----------|
| 16MB | (4) 256K x | (4) 256K x | (4) 256K | (4) 256K |
| | 36 | 36 | x 36 | x 36 |
|---------+--------------+-------------+----------+----------|
| 16MB | (4) 1M x 36 | NONE | NONE | NONE |
|---------+--------------+-------------+----------+----------|
| 20MB | (4) 1M x 36 | (4) 256K x | NONE | NONE |
| | | 36 | | |
|---------+--------------+-------------+----------+----------|
| 24MB | (4) 1M x 36 | (4) 256K x | (4) 256K | NONE |
| | | 36 | x 36 | |
|---------+--------------+-------------+----------+----------|
| 28MB | (4) 1M x 36 | (4) 256K x | (4) 256K | (4) 256K |
| | | 36 | x 36 | x 36 |
|---------+--------------+-------------+----------+----------|
| 32MB | (4) 1M x 36 | (4) 1M x 36 | NONE | NONE |
|---------+--------------+-------------+----------+----------|
| 36MB | (4) 1M x 36 | (4) 1M x 36 | (4) 256K | NONE |
| | | | x 36 | |
|---------+--------------+-------------+----------+----------|
| 40MB | (4) 1M x 36 | (4) 1M x 36 | (4) 256K | (4) 256K |
| | | | x 36 | x 36 |
|---------+--------------+-------------+----------+----------|
| 48MB | (4) 1M x 36 | (4) 1M x 36 | (4) 1M x | NONE |
| | | | 36 | |
|---------+--------------+-------------+----------+----------|
| 52MB | (4) 1M x 36 | (4) 1M x 36 | (4) 1M x | (4) 256K |
| | | | 36 | x 36 |
|---------+--------------+-------------+----------+----------|
| 64MB | (4) 1M x 36 | (4) 1M x 36 | (4) 1M x | (4) 1M x |
| | | | 36 | 36 |
|---------+--------------+-------------+----------+----------|
| 64MB | (4) 4M x 36 | NONE | NONE | NONE |
|---------+--------------+-------------+----------+----------|
| 128MB | (4) 4M x 36 | (4) 4M x 36 | NONE | NONE |
|---------+--------------+-------------+----------+----------|
| 192MB | (4) 4M x 36 | (4) 4M x 36 | (4) 4M x | NONE |
| | | | 36 | |
|---------+--------------+-------------+----------+----------|
| 256MB | (4) 4M x 36 | (4) 4M x 36 | (4) 4M x | (4) 4M x |
| | | | 36 | 36 |
|------------------------------------------------------------|
| Note:Banks 2 and 3 are used when a 32-bit external memory |
| card is installed at CN1. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG (U19) | TAG (U20) |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 8K x 8 | (1) 8K x 8 |
| | | 8 | | |
|-------+-------------+------------+------------+------------|
| 512KB | (4) 128K x | NONE | (1) 32K x | NONE |
| | 8 | | 8 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J1 | J2 | J3 | J4 | J5 | J6 | J8 |
|-------+-------+-------+-------+-------+-------+------+-----|
| 64KB | Open | Open | Open | Open | Open | Open |2 & 3|
|-------+-------+-------+-------+-------+-------+------+-----|
| 128KB | Open | Open |Closed | Open |Closed | Open |1 & 2|
|-------+-------+-------+-------+-------+-------+------+-----|
| 256KB | Open |Closed |Closed |Closed |Closed | Open |2 & 3|
|-------+-------+-------+-------+-------+-------+------+-----|
| 512KB |Closed |Closed |Closed |Closed |Closed |Closed|1 & 2|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J9 | J10 |
|------------+--------------------+--------------------------|
| 80486SX | Open | pins 1 & 2, 3 & 4 closed |
|------------+--------------------+--------------------------|
| ODP486SX | pins 1 & 2 closed | pins 2 & 3 closed |
|------------+--------------------+--------------------------|
| 80487SX | pins 1 & 2 closed | pins 2 & 3 closed |
|------------+--------------------+--------------------------|
| 80486DX | pins 2 & 3 closed | pins 1 & 2, 3 & 4 closed |
|------------+--------------------+--------------------------|
| 80486DX2 | pins 2 & 3 closed | pins 1 & 2, 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
|Speed | J7 | J13 | J14 | J15 | J16 | J17 | J18 | J19 |
|------+------+------+------+------+------+------+-----+-----|
|20MHz |Closed| Open | Open |Closed| Open | Open |1 & 2|1 & 2|
|------+------+------+------+------+------+------+-----+-----|
|25MHz | Open |Closed|Closed| Open | Open | Open |1 & 2|2 & 3|
|------+------+------+------+------+------+------+-----+-----|
|33MHz | Open | Open |Closed| Open |Closed| Open |1 & 2|2 & 3|
|------+------+------+------+------+------+------+-----+-----|
|50iMHz| Open |Closed|Closed| Open | Open | Open |1 & 2|2 & 3|
|------+------+------+------+------+------+------+-----+-----|
|50MHz | Open | Open | Open | Open |Closed|Closed|2 & 3|2 & 3|
|------+------+------+------+------+------+------+-----+-----|
|66iMHz| Open | Open |Closed| Open |Closed| Open |1 & 2|2 & 3|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+