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# MYLEX CORPORATION
MGI 486
Processor 80486SX/80486SX2/UMCU5/CX486DX/AM486DX/AM486DXL/80486DX/ CX486DX2/
AM486DX2/AM486DXL2/80486DX2/80486DX4/P24D/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set SIS
Max. 64MB
Onboard
DRAM
Cache 64/128/256/512KB
BIOS Award
Dimensions 250mm x 220mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Green PC | D4 | Reset switch | J5 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Green PC | J1 | Turbo switch | J6 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Power LED & | J2 | Turbo LED | J7 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J3 | Green PC | JP13 |
| | | connector | |
|-------------------+----------+------------------+----------|
| External battery | J4 | 32-bit VESA | SL1 - |
| | | local bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | JP11 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP11 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | RP1 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (OPTION 1) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|-------------+---------------+---------------+--------------|
| 1MB | (4) 256K x 9 | NONE | NONE |
|-------------+---------------+---------------+--------------|
| 4MB | (4) 1M x 9 | NONE | NONE |
|-------------+---------------+---------------+--------------|
| 16MB | (4) 4M x 9 | NONE | NONE |
|-------------+---------------+---------------+--------------|
| 64MB | (4) 16M x 9 | NONE | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (OPTION 2) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|-------------+--------------+---------------+---------------|
| 1MB | NONE | (1) 256K x 36 | NONE |
|-------------+--------------+---------------+---------------|
| 2MB | NONE | (1) 256K x 36 | (1) 256K x 36 |
|-------------+--------------+---------------+---------------|
| 4MB | NONE | (1) 1M x 36 | NONE |
|-------------+--------------+---------------+---------------|
| 5MB | NONE | (1) 256K x 36 | (1) 1M x 36 |
|-------------+--------------+---------------+---------------|
| 8MB | NONE | (1) 1M x 36 | (1) 1M x 36 |
|-------------+--------------+---------------+---------------|
| 16MB | NONE | (1) 4M x 36 | NONE |
|-------------+--------------+---------------+---------------|
| 20MB | NONE | (1) 1M x 36 | (1) 4M x 36 |
|-------------+--------------+---------------+---------------|
| 32MB | NONE | (1) 4M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (OPTION 3) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|-------------+--------------+---------------+---------------|
| 2MB | NONE | (1) 512K x 36 | NONE |
|-------------+--------------+---------------+---------------|
| 8MB | NONE | (1) 2M x 36 | NONE |
|-------------+--------------+---------------+---------------|
| 10MB | NONE | (1) 512K x 36 | (1) 2M x 36 |
|-------------+--------------+---------------+---------------|
| 16MB | NONE | (1) 2M x 36 | (1) 2M x 36 |
|-------------+--------------+---------------+---------------|
| 32MB | NONE | (1) 8M x 36 | NONE |
|-------------+--------------+---------------+---------------|
| 40MB | NONE | (1) 2M x 36 | (1) 8M x 36 |
|-------------+--------------+---------------+---------------|
| 64MB | NONE | (1) 8M x 36 | (1) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (OPTION 4) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (4) 1M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (OPTION 5) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 2M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 16MB | (4) 1M x 9 | (1) 2M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 64MB | (4) 4M x 9 | (1) 8M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM RESISTOR CONFIGURATION |
|------------------------------------------------------------|
| Setting | RP7 | RP8 | RP9 | RP10 |
|----------+------------+------------+-----------+-----------|
| Option 1 | Not | Not | Not | Installed |
| | installed | installed | installed | |
|----------+------------+------------+-----------+-----------|
| Option 2 | Not | Installed | Not | Not |
| | installed | | installed | installed |
|----------+------------+------------+-----------+-----------|
| Option 3 | Installed | Not | Not | Not |
| | | installed | installed | installed |
|----------+------------+------------+-----------+-----------|
| Option 4 | Not | Not | Not | Installed |
| | installed | installed | installed | |
|----------+------------+------------+-----------+-----------|
| Option 5 | Not | Not | Installed | Not |
| | installed | installed | | installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 x 8 |
|-------+-------------+-------------+------------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8 or (1) 32K |
| | | | x 8 |
|-------+-------------+-------------+------------------------|
| 256KB | (4) 64K x 8 | NONE | (1) 16K x 8 or (1) 32K |
| | | | x 8 |
|-------+-------------+-------------+------------------------|
| 512KB | (4) 64K x 8 | (4) 64K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP9 | JP20 |
|------------------+--------------------+--------------------|
| 64KB | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 128KB | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 256KB | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 256KB | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 512KB | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE RESISTOR CONFIGURATION |
|------------------------------------------------------------|
|Size | RP15 | RP16 | RP17 | RP18 | RP19 |
|-----+----------+----------+----------+----------+----------|
|64KB |Installed | Not | Not | Not | Not |
| | |installed |installed |installed |installed |
|-----+----------+----------+----------+----------+----------|
|128KB| Not |Installed | Not | Not | Not |
| |installed | |installed |installed |installed |
|-----+----------+----------+----------+----------+----------|
|256KB| Not | Not |Installed | Not | Not |
| |installed |installed | |installed |installed |
|-----+----------+----------+----------+----------+----------|
|256KB| Not | Not | Not |Installed | Not |
| |installed |installed |installed | |installed |
|-----+----------+----------+----------+----------+----------|
|512KB| Not | Not | Not | Not |Installed |
| |installed |installed |installed |installed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP3 | JP17 | JP18 | JP21 | JP23 |
|------------+---------+---------+---------+--------+--------|
| 80486SX | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+---------+---------+---------+--------+--------|
| 80486SX2 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+---------+---------+---------+--------+--------|
| UMCU5 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+---------+---------+---------+--------+--------|
| CX486DX | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+---------+---------+---------+--------+--------|
| 80486DX | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+---------+---------+---------+--------+--------|
| 80486DX2 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+---------+---------+---------+--------+--------|
| 80486DX4 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+---------+---------+---------+--------+--------|
| P24D | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------+---------+---------+---------+--------+--------|
| P24T | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+--------------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|--------------------------------------------------------------------|
| Type | RP3 | RP4 | RP5 | RP6 | RP30 | RP31 |
|--------+---------+---------+---------+---------+---------+---------|
|80486SX | Not | Not |Installed| Not | Not |Installed|
| |installed|installed| |installed|installed| |
|--------+---------+---------+---------+---------+---------+---------|
|80486SX2| Not | Not |Installed| Not | Not |Installed|
| |installed|installed| |installed|installed| |
|--------+---------+---------+---------+---------+---------+---------|
| UMCU5 | Not | Not |Installed| Not | Not |Installed|
| |installed|installed| |installed|installed| |
|--------+---------+---------+---------+---------+---------+---------|
|CX486DX |Installed| Not | Not | Not |Installed| Not |
| | |installed|installed|installed| |installed|
|--------+---------+---------+---------+---------+---------+---------|
|80486DX |Installed| Not | Not | Not | Not |Installed|
| | |installed|installed|installed|installed| |
|--------+---------+---------+---------+---------+---------+---------|
|80486DX2|Installed| Not | Not | Not | Not |Installed|
| | |installed|installed|installed|installed| |
|--------+---------+---------+---------+---------+---------+---------|
|80486DX4|Installed| Not | Not | Not | Not |Installed|
| | |installed|installed|installed|installed| |
|--------+---------+---------+---------+---------+---------+---------|
| P24D | Not |Installed| Not |Installed| Not | Not |
| |installed| |installed| |installed|installed|
|--------+---------+---------+---------+---------+---------+---------|
| P24T |Installed| Not | Not | Not | Not |Installed|
| | |installed|installed|installed|installed| |
+--------------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (MX8315/UM9515 CLOCK) |
|------------------------------------------------------------|
| Speed | JP5 | JP6 | JP7 |
|---------------+---------------+--------------+-------------|
| 25MHz | Open | Open | Closed |
|---------------+---------------+--------------+-------------|
| 33MHz | Closed | Closed | Closed |
|---------------+---------------+--------------+-------------|
| 40MHz | Open | Closed | Closed |
|---------------+---------------+--------------+-------------|
| 50iMHz | Open | Open | Closed |
|---------------+---------------+--------------+-------------|
| 50MHz | Closed | Open | Open |
|---------------+---------------+--------------+-------------|
| 66iMHz | Closed | Closed | Closed |
|---------------+---------------+--------------+-------------|
| 75iMHz | Open | Open | Closed |
|---------------+---------------+--------------+-------------|
| 100iMHz | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (IMI SC466 CLOCK) |
|------------------------------------------------------------|
| Speed | JP5 | JP6 | JP7 |
|---------------+---------------+---------------+------------|
| 25MHz | Open | Open | Open |
|---------------+---------------+---------------+------------|
| 33MHz | Closed | Closed | Open |
|---------------+---------------+---------------+------------|
| 40MHz | Open | Closed | Open |
|---------------+---------------+---------------+------------|
| 50iMHz | Open | Open | Open |
|---------------+---------------+---------------+------------|
| 50MHz | Closed | Open | Open |
|---------------+---------------+---------------+------------|
| 66iMHz | Closed | Closed | Open |
|---------------+---------------+---------------+------------|
| 75iMHz | Open | Open | Open |
|---------------+---------------+---------------+------------|
| 100iMHz | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CORE FREQUENCY CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP22 | JP27 |
|---------------------+--------------------+-----------------|
| Cyrix | pins 1 & 2 closed | Open |
|---------------------+--------------------+-----------------|
| AMD486DX2 | Open | Closed |
|---------------------+--------------------+-----------------|
| Intel 80486DX (3x) | Open | Open |
|---------------------+--------------------+-----------------|
| AMD486DX4 | Open | Open |
|---------------------+--------------------+-----------------|
| Intel 80486DX4 (2x) | pins 2 & 3 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP1 | JP2 | JP4 | JP24 |
|----------+---------+---------+---------+-------------------|
| 3.3v | Open | Open | Open | pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 4.0v | Open | Open | Open | pins 2 & 3 closed |
|----------+---------+---------+---------+-------------------|
| 5.0v | Closed | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP15 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP16 |
|----------------------------+-------------------------------|
| <= 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+