TEXT View Source
# MICRONICS COMPUTERS, INC.
486DX2/50 SYSTEM BOARD
Processor 80486DX2
Processor Speed 50(internal)MHz
Chip Set Micronics
Max. Onboard DRAM 64MB (32MB on external memory board)
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| External battery | J11 | Turbo LED | W5 |
|--------------------+----------+-----------------+----------|
| Speaker | J23 | Reset switch | W6 |
|--------------------+----------+-----------------+----------|
| Power LED & | J24 | Turbo switch | W7 |
| keylock | | | |
|--------------------+----------+-----------------+----------|
| External keyboard | W1 | 32-bit external | SL1 |
| connector | | memory card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|---+-----------------------------------+---------+----------|
| » | I/O delay enabled | SW1/4 | Off |
|---+-----------------------------------+---------+----------|
| | I/O delay disabled | SW1/4 | On |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | SW1/5 | Off |
|---+-----------------------------------+---------+----------|
| » | Video BIOS cache enabled | SW1/6 | Off |
|---+-----------------------------------+---------+----------|
| | Video BIOS cache disabled | SW1/6 | On |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | SW1/7 | Off |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | SW1/8 | Off |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | SW2/6 | On |
|---+-----------------------------------+---------+----------|
| » | Cache enabled | SW2/7 | Off |
|---+-----------------------------------+---------+----------|
| | Cache disabled | SW2/7 | On |
|---+-----------------------------------+---------+----------|
| » | Cache enabled | SW2/8 | Off |
|---+-----------------------------------+---------+----------|
| | Cache disabled | SW2/8 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 3MB | (4) 256K x | (4) 256K x | (4) 256K x | NONE |
| | 9 | 9 | 9 | |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 256K x | (4) 256K x | (4) 256K x | (4) 256K x |
| | 9 | 9 | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (4) 256K x | (4) 1M x 9 | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 6MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 7MB | (4) 256K x | (4) 256K x | (4) 256K x | (4) 1M x 9 |
| | 9 | 9 | 9 | |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 9MB | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 10MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 13MB | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 28MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 |
|------+-------------+-------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 40MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------+-------------+-------------+------------+------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 52MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------+-------------+-------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------------------------------------------------------------|
| Note: Banks 2 & 3 are located on the external memory card. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | Off |
|---------+----------+---------+---------+---------+---------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W3 | W4 | W15 |
|------------+-------------+-------------+-------------------|
| 64KB | Open | Open | pins 2 & 3 closed |
|------------+-------------+-------------+-------------------|
| 256KB | Closed | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+