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# MICRONICS COMPUTERS, INC.
JX30G VL-BUS
Processor 80486SX/80486DX/80486DX2/Pentium Overdrive
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set Micronics
Max. Onboard 64MB
DRAM
Cache 64/128/256KB
BIOS Phoenix
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2), floppy drive
interface,
IDE interface, parallel port, PS/2 mouse port,
serial ports (2)
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| IDE interface | CN2 | Speaker | J30 |
|--------------------+----------+-----------------+----------|
| Floppy drive | CN3 | Power LED & | J31 |
| interface | | keylock | |
|--------------------+----------+-----------------+----------|
| External battery | J8 | 32-bit VESA | S1 |
| | | Local bus slot | |
|--------------------+----------+-----------------+----------|
| Serial port 2 | J9 | 32-bit VESA | S2 |
| | | Local bus slot | |
|--------------------+----------+-----------------+----------|
| External | J10 | Turbo LED | W18 |
| keyboard/PS2 style | | | |
| mouse | | | |
|--------------------+----------+-----------------+----------|
| Serial port 1 | J14 | Reset switch | W20 |
|--------------------+----------+-----------------+----------|
| Parallel port | J16 | IDE interface | W21 |
| | | LED | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 3 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 4 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select color | W2 | Closed |
|---+---------------------------+---------------+------------|
| | Monitor type select | W2 | Open |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| » | PS/2 mouse enabled | W3 | Closed |
|---+---------------------------+---------------+------------|
| | PS/2 mouse disabled | W3 | Open |
|---+---------------------------+---------------+------------|
| » | Parity enabled | W4 | Closed |
|---+---------------------------+---------------+------------|
| | Parity disabled | W4 | Open |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W6 | Open |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Parallel port | W7 | pins 1 & 2 |
| | unidirectional (for | | closed |
| | printer) | | |
|---+---------------------------+---------------+------------|
| | Parallel port | W7 | pins 2 & 3 |
| | bi-directional | | closed |
|---+---------------------------+---------------+------------|
| » | CMOS memory normal | W8 | pins 2 & 3 |
| | operation | | closed |
|---+---------------------------+---------------+------------|
| | CMOS memory clear | W8 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W9 | Open |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W25 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W26 | N/A |
| | not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REAL TIME CLOCK SETTINGS |
|------------------------------------------------------------|
| Settings | W1 | W5 |
|-----------------------------------------+---------+--------|
| DALLAS Real Time Clock enabled | Closed | N/A |
|-----------------------------------------+---------+--------|
| MOTOROLA 146818 Real Time Clock enabled | Open | N/A |
|-----------------------------------------+---------+--------|
| DALLAS Real Time Clock clear | N/A | Closed |
|-----------------------------------------+---------+--------|
| Real time clock normal operation | N/A | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 256K x | (1) 256K x | (1) 1M x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 256K x | (1) 256K x | (1) 1M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 256K x | (1) 256K x | (1) 4M x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG/U34 | TAG/U61 |
|---------+-------------+----------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x | (1) 8K x 8 | (1) 8K x 8 |
| | | 8 | | |
|---------+-------------+----------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 32K x | (1) 32K x |
| | | | 8 | 8 |
|---------+-------------+----------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K | (1) 32K x | (1) 32K x |
| | | x 8 | 8 | 8 |
|------------------------------------------------------------|
| Note:If Write-Through caching is not being used, the chip |
| at U61 is not installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W10 | W11 | W22 | W23 | W24 |
|----------+----------+----------+---------+--------+--------|
| 64KB | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 128KB | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHING METHOD CONFIGURATION |
|------------------------------------------------------------|
| Method | Size | W16 | W17 |
|---------------+-------+------------------+-----------------|
| Write-Through | All | Open | Open |
|---------------+-------+------------------+-----------------|
| Write-Back | 64KB | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|---------------+-------+------------------+-----------------|
| Write-Back | 128KB | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|---------------+-------+------------------+-----------------|
| Write-Back | 256KB | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | W12 |
|------------------------------+-----------------------------|
| 80486SX | pins 1 & 2 closed |
|------------------------------+-----------------------------|
| 80486DX | pins 2 & 3 closed |
|------------------------------+-----------------------------|
| 804896DX2 | pins 2 & 3 closed |
|------------------------------+-----------------------------|
| Pentium Overdrive | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU PQFP CONFIGURATION |
|------------------------------------------------------------|
| PQFP | W13 |
|----------------------------+-------------------------------|
| Enabled | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Disabled | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | SW1/switch 1 | SW1/switch 2 |
|------------------+--------------------+--------------------|
| 25MHz | Off | On |
|------------------+--------------------+--------------------|
| 33MHz | On | On |
|------------------+--------------------+--------------------|
| 50i MHz | Off | On |
|------------------+--------------------+--------------------|
| 66i MHz | On | On |
+------------------------------------------------------------+