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# MICRONICS COMPUTERS, INC.
80486 ASIC EISA SYSTEM BOARD
Processor 80486DX/80486DX2
Processor Speed 33/50(internal)MHz
Chip Set Intel
Max. Onboard 64MB
DRAM
Cache 64/256KB
BIOS Phoenix
Dimensions 355mm x 304mm
I/O Options 32-bit local bus slot, floppy drive interface,
parallel port, serial ports (2)
NPU Options 4167
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| External keyboard | J1 | Speaker | J22 |
| connector | | | |
|----------------------+----------+---------------+----------|
| Parallel port | J4 | Power LED & | J23 |
| | | keylock | |
|----------------------+----------+---------------+----------|
| Serial port 1 | J5 | 32-bit Local | S1 |
| | | bus slot | |
|----------------------+----------+---------------+----------|
| Serial port 2 | J15 | Reset switch | W5 |
|----------------------+----------+---------------+----------|
| Floppy drive | J17 | Turbo switch | W6 |
| interface | | | |
|----------------------+----------+---------------+----------|
| External battery | J17A | Turbo LED | W7 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Factory configured - do | SW1/6 | On |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/7 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select color | SW1/8 | On |
|---+---------------------------+---------------+------------|
| | Monitor type select | SW1/8 | Off |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W11 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W12 | pins 1 & 2 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Floppy drive interface | W13 | pins 1 & 2 |
| | enabled | | closed |
|---+---------------------------+---------------+------------|
| | Floppy drive interface | W13 | pins 2 & 3 |
| | disabled | | closed |
|---+---------------------------+---------------+------------|
| » | CPU select 486DX2/50MHz | W43 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | CPU select 486DX/33MHz | W43 | Open |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | W45 | pins 1 & 2 |
| | not alter | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT CONFIGURATION |
|------------------------------------------------------------|
| I/O | Port | W3 | W4 | W10 |
| Address | | | | |
|-----------+----------+-------------+-----------+-----------|
| 3BC-3BEh | LPT1 | pins 1 & 2 | pins 2 & | pins 2 & |
| | | closed | 3 closed | 3 closed |
|-----------+----------+-------------+-----------+-----------|
| 378-37Ah | LPT2 | pins 1 & 2 | pins 1 & | pins 2 & |
| | | closed | 2 closed | 3 closed |
|-----------+----------+-------------+-----------+-----------|
| 278-27Ah | LPT3 | pins 2 & 3 | pins 1 & | pins 2 & |
| | | closed | 2 closed | 3 closed |
|-----------+----------+-------------+-----------+-----------|
| N/A | Disabled | pins 2 & 3 | pins 2 & | pins 2 & |
| | | closed | 3 closed | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT CONFIGURATION |
|------------------------------------------------------------|
| Port 1 | Port 2 | W2 | W8 | W9 |
|----------+----------+------------+------------+------------|
| COM1 | COM2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed | closed |
|----------+----------+------------+------------+------------|
| COM1 | Disabled | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed | closed |
|----------+----------+------------+------------+------------|
| Disabled | COM2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed | closed |
|----------+----------+------------+------------+------------|
| Disabled | Disabled | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 3MB | (4)256K x 9 | (4)256K x 9 | (4)256K x | NONE |
| | | | 9 | |
|------+-------------+-------------+------------+------------|
| 4MB | (4)256K x 9 | (4)256K x 9 | (4)256K x | (4)256K x |
| | | | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 4MB | (4)1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (4)256K x 9 | (4)1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 6MB | (4)256K x 9 | (4)256K x 9 | (4)1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 7MB | (4)256K x 9 | (4)256K x 9 | (4)256K x | (4)1M x 9 |
| | | | 9 | |
|------+-------------+-------------+------------+------------|
| 8MB | (4)1M x 9 | (4)1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 9MB | (4)256K x 9 | (4)1M x 9 | (4)1M x 9 | (4)1M x 9 |
|------+-------------+-------------+------------+------------|
| 10MB | (4)256K x 9 | (4)256K x 9 | (4)1M x 9 | (4)1M x 9 |
|------+-------------+-------------+------------+------------|
| 12MB | (4)1M x 9 | (4)1M x 9 | (4)1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 13MB | (4)256K x 9 | (4)1M x 9 | (4)1M x 9 | (4)1M x 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
|Size|SW1/switch |SW1/switch|SW1/switch|SW1/switch|SW1/switch|
| | 1 | 2 | 3 | 4 | 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| On | On | Off | On | On |
|----+-----------+----------+----------+----------+----------|
|16MB| Off | Off | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION (CONT.) |
|------------------------------------------------------------|
|Size|SW1/switch |SW1/switch|SW1/switch|SW1/switch|SW1/switch|
| | 1 | 2 | 3 | 4 | 5 |
|----+-----------+----------+----------+----------+----------|
|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 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------------------------------------------------------|
| Note:The exact location of TAG is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W20 | W21 | W41 | W44 |
|-------+-------------+------------+------------+------------|
| 64KB | Open | Open | Open | Pins 2 & 3 |
| | | | | closed |
|-------+-------------+------------+------------+------------|
| 256KB | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+