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# MICRONICS COMPUTERS, INC.
486/25
Processor 80486DX
Processor Speed 25MHz
Chip Set Micronics
Max. Onboard DRAM 16MB
Cache 64/128/256KB
BIOS Phoenix
Dimensions 355mm x 304mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J2 | Reset switch | W4 |
|---------------------+----------+----------------+----------|
| Speaker | J22 | Turbo LED | W5 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J23 | Turbo switch | W6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Internal cache enabled | SW1/1 | On |
|---+---------------------------+---------------+------------|
| | Internal cache disabled | SW1/1 | Off |
|---+---------------------------+---------------+------------|
| » | On board BIOS enabled | SW1/2 | Off |
|---+---------------------------+---------------+------------|
| | External BIOS enabled | SW1/2 | On |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/3 | On |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | External cache enabled | SW1/4 | On |
|---+---------------------------+---------------+------------|
| | External cache disabled | SW1/4 | Off |
|---+---------------------------+---------------+------------|
| » | BIOS relocation disabled | SW1/5 | Off |
|---+---------------------------+---------------+------------|
| | BIOS relocation enabled | SW1/5 | On |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/6 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select | SW1/7 | On |
| | color, CGA, EGA, or VGA | | |
|---+---------------------------+---------------+------------|
| | Monitor type select | SW1/7 | Off |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/8 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW2/5 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | D00000-EFFFFF cacheable | SW2/6 | Off |
|---+---------------------------+---------------+------------|
| | D00000-EFFFFF | SW2/6 | On |
| | non-cacheable | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W1 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W2 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W3 | N/A |
| | not alter | | |
|------------------------------------------------------------|
| Note:The exact location of W2 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
|Size|Bank 0 |Bank 1 |Bank 2 |Bank 3 |SW1/1|SW1/2|SW1/3|SW1/4|
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|1MB |(4)256K| NONE | NONE | NONE | On | On | On | On |
| | x 9 | | | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|2MB |(4)256K|(4)256K| NONE | NONE | Off | On | On | On |
| | x 9 | x 9 | | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|3MB |(4)256K|(4)256K|(4)256K| NONE | On | Off | On | On |
| | x 9 | x 9 | x 9 | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|4MB |(4)256K|(4)256K|(4)256K|(4)256K| Off | Off | On | On |
| | x 9 | x 9 | x 9 | x 9 | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|4MB |(4)1M x| NONE | NONE | NONE | On | On | Off | On |
| | 9 | | | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|5MB |(4)256K|(4)1M x| NONE | NONE | On | On | Off | Off |
| | x 9 | 9 | | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|6MB |(4)256K|(4)256K|(4)1M x| NONE | On | Off | On | Off |
| | x 9 | x 9 | 9 | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|7MB |(4)256K|(4)256K|(4)256K|(4)1M x| Off | On | On | Off |
| | x 9 | x 9 | x 9 | 9 | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|8MB |(4)1M x|(4)1M x| NONE | NONE | Off | On | Off | On |
| | 9 | 9 | | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|9MB |(4)256K|(4)1M x|(4)1M x| NONE | On | Off | Off | Off |
| | x 9 | 9 | 9 | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|10MB|(4)256K|(4)256K|(4)1M x|(4) 1M | Off | Off | On | Off |
| | x 9 | x 9 | 9 | x 9 | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|12MB|(4)1M x|(4)1M x|(4)1M x| NONE | On | Off | Off | On |
| | 9 | 9 | 9 | | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|13MB|(4)256K|(4)1M x|(4)1M x|(4)1M x| Off | Off | Off | Off |
| | x 9 | 9 | 9 | 9 | | | | |
|----+-------+-------+-------+-------+-----+-----+-----+-----|
|16MB|(4)1M x|(4)1M x|(4)1M x|(4)1M x| Off | Off | Off | On |
| | 9 | 9 | 9 | 9 | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------------------------------------------------------|
| Note:The exact location of the TAG chip is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | SW2/7 | SW2/8 | W8 | W9 |
|-------+-------+-------+------------------+-----------------|
| 64KB | Off | Off | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
|-------+-------+-------+------------------+-----------------|
| 128KB | On | On | pins 2 & 3 | pins 1 & 2 |
| | | | closed | closed |
|-------+-------+-------+------------------+-----------------|
| 256KB | Off | On | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
+------------------------------------------------------------+