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# MICRONICS COMPUTERS, INC.
486DX2 SYSTEM BOARD
Processor 80486DX2
Processor Speed 50(internal)MHz
Chip Set Micronics
Max. Onboard DRAM 64MB
Cache 64/256KB
BIOS Phoenix
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | J11 | Reset switch | W6 |
|-------------------+----------+------------------+----------|
| Speaker | J23 | Turbo switch | W7 |
|-------------------+----------+------------------+----------|
| Keylock/power LED | J24 | 32-bit external | S1 |
| | | memory card | |
|-------------------+----------+------------------+----------|
| Turbo LED | W5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
|--------------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW1/1 | On |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW1/2 | Off |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW1/3 | Off |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW1/4 | On |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW1/5 | Off |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW1/6 | Off |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW1/7 | Off |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW1/8 | Off |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW2/6 | On |
|---+----------------------------------+---------+-----------|
| » | Factory configured-do not alter | SW2/7 | Off |
|---+----------------------------------+---------+-----------|
| | 64KB External cache select | SW2/8 | Off |
|---+----------------------------------+---------+-----------|
| | 256KB External cache select | SW2/8 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|---------+--------------+-----------+-----------+-----------|
| 1MB | (4) 256K x 9 | NONE | NONE | NONE |
|---------+--------------+-----------+-----------+-----------|
| 2MB | (4) 256K x 9 | (4) 256K | NONE | NONE |
| | | x 9 | | |
|---------+--------------+-----------+-----------+-----------|
| 3MB | (4) 256K x 9 | (4) 256K | (4) 256K | NONE |
| | | x 9 | x 9 | |
|---------+--------------+-----------+-----------+-----------|
| 4MB | (4) 256K x 9 | (4) 256K | (4) 256K | (4) 256K |
| | | x 9 | x 9 | x 9 |
|---------+--------------+-----------+-----------+-----------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|---------+--------------+-----------+-----------+-----------|
| 5MB | (4) 256K x 9 | (4) 1M x | NONE | NONE |
| | | 9 | | |
|---------+--------------+-----------+-----------+-----------|
| 6MB | (4) 256K x 9 | (4) 256K | (4) 1M x | NONE |
| | | x 9 | 9 | |
|---------+--------------+-----------+-----------+-----------|
| 7MB | (4) 256K x 9 | (4) 256K | (4) 256K | (4) 1M x |
| | | x 9 | x 9 | 9 |
|---------+--------------+-----------+-----------+-----------|
| 8MB | (4) 1M x 9 | (4) 1M x | NONE | NONE |
| | | 9 | | |
|---------+--------------+-----------+-----------+-----------|
| 9MB | (4) 256K x 9 | (4) 1M x | (4) 1M x | NONE |
| | | 9 | 9 | |
|---------+--------------+-----------+-----------+-----------|
| 10MB | (4) 256K x 9 | (4) 256K | (4) 1M x | (4) 1M x |
| | | x 9 | 9 | 9 |
|---------+--------------+-----------+-----------+-----------|
| 12MB | (4) 1M x 9 | (4) 1M x | (4) 1M x | NONE |
| | | 9 | 9 | |
|---------+--------------+-----------+-----------+-----------|
| 13MB | (4) 256K x 9 | (4) 1M x | (4) 1M x | (4) 1M x |
| | | 9 | 9 | 9 |
|---------+--------------+-----------+-----------+-----------|
| 16MB | (4) 1M x 9 | (4) 1M x | (4) 1M x | (4) 1M x |
| | | 9 | 9 | 9 |
|---------+--------------+-----------+-----------+-----------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|---------+--------------+-----------+-----------+-----------|
| 20MB | (4) 1M x 9 | (4) 4M x | NONE | NONE |
| | | 9 | | |
|---------+--------------+-----------+-----------+-----------|
| 24MB | (4) 1M x 9 | (4) 1M x | (4) 4M x | NONE |
| | | 9 | 9 | |
|---------+--------------+-----------+-----------+-----------|
| 28MB | (4) 1M x 9 | (4) 1M x | (4) 1M x | (4) 4M x |
| | | 9 | 9 | 9 |
|---------+--------------+-----------+-----------+-----------|
| 32MB | (4) 4M x 9 | (4) 4M x | NONE | NONE |
| | | 9 | | |
|---------+--------------+-----------+-----------+-----------|
| 36MB | (4) 1M x 9 | (4) 4M x | (4) 4M x | NONE |
| | | 9 | 9 | |
|---------+--------------+-----------+-----------+-----------|
| 40MB | (4) 1M x 9 | (4) 1M x | (4) 4M x | (4) 4M x |
| | | 9 | 9 | 9 |
|---------+--------------+-----------+-----------+-----------|
| 48MB | (4) 4M x 9 | (4) 4M x | (4) 4M x | NONE |
| | | 9 | 9 | |
|---------+--------------+-----------+-----------+-----------|
| 52MB | (4) 1M x 9 | (4) 4M x | (4) 4M x | (4) 4M x |
| | | 9 | 9 | 9 |
|---------+--------------+-----------+-----------+-----------|
| 64MB | (4) 4M x 9 | (4) 4M x | (4) 4M x | (4) 4M x |
| | | 9 | 9 | 9 |
|------------------------------------------------------------|
| Note:Banks 2 & 3 are located on a memory expansion card |
| that fits in the 32-bit expansion slot. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | SW2/1 | SW2/2 | SW2/3 | SW2/4 | SW2/5 |
|---------+----------+---------+---------+---------+---------|
| 1MB | On | On | On | On | On |
|---------+----------+---------+---------+---------+---------|
| 2MB | Off | On | On | On | On |
|---------+----------+---------+---------+---------+---------|
| 3MB | On | Off | On | On | On |
|---------+----------+---------+---------+---------+---------|
| 4MB | Off | Off | On | On | On |
|---------+----------+---------+---------+---------+---------|
| 4MB | On | On | Off | On | On |
|---------+----------+---------+---------+---------+---------|
| 5MB | On | On | Off | Off | On |
|---------+----------+---------+---------+---------+---------|
| 6MB | On | Off | On | Off | On |
|---------+----------+---------+---------+---------+---------|
| 7MB | Off | On | On | Off | On |
|---------+----------+---------+---------+---------+---------|
| 8MB | Off | On | Off | On | On |
|---------+----------+---------+---------+---------+---------|
| 9MB | On | Off | Off | Off | On |
|---------+----------+---------+---------+---------+---------|
| 10MB | Off | Off | On | Off | On |
|---------+----------+---------+---------+---------+---------|
| 12MB | On | Off | Off | On | On |
|---------+----------+---------+---------+---------+---------|
| 13MB | Off | Off | Off | Off | On |
|---------+----------+---------+---------+---------+---------|
| 16MB | Off | Off | Off | On | On |
|---------+----------+---------+---------+---------+---------|
| 16MB | On | On | Off | On | Off |
|---------+----------+---------+---------+---------+---------|
| 20MB | On | On | Off | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 24MB | On | Off | On | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 28MB | Off | On | On | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 32MB | Off | On | Off | On | Off |
|---------+----------+---------+---------+---------+---------|
| 36MB | On | Off | Off | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 40MB | Off | Off | On | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 48MB | On | Off | Off | On | Off |
|---------+----------+---------+---------+---------+---------|
| 52MB | Off | Off | Off | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 64MB | Off | Off | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTERNAL CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | W3 | W4 | W15 |
|------------+-------------+-------------+-------------------|
| 64KB | Open | Open | pins 2 & 3 closed |
|------------+-------------+-------------+-------------------|
| 256KB | Closed | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+