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# MICRONICS COMPUTERS, INC.
EISA-3 SYSTEM BOARD
Processor 80486SX/80486DX/ODP486SX/80486DX2
Processor Speed 25/33/50(internal)/50/66(internal)MHz
Chip Set Micronics
Max. Onboard DRAM 64MB
Cache 64/128/256/512KB
BIOS Phoenix
Dimensions 330mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J3 | Power LED & | J11 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo LED | J5 | Speaker | J13 |
|------------------+----------+-------------------+----------|
| Turbo switch | J8 | External keyboard | J23 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Reset switch | J9 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| | Function | Jumper | Position |
|---+------------------------------------+--------+----------|
| » | Monitor type select color | J12 | Closed |
|---+------------------------------------+--------+----------|
| | Monitor type select monochrome | J12 | Open |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | J25 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 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 |
|------+-------------+-------------+------------+------------|
| 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/U101|TAG/U102|TAG/U103 |TAG/U104 |
|-----+--------+-------+--------+--------+---------+---------|
|64KB |(4) 8K x|(4) 8K | NONE | NONE |(1) 64K x|(1) 32K x|
| | 8 | x 8 | | | 1 | 8 |
|-----+--------+-------+--------+--------+---------+---------|
|128KB|(4) 32K | NONE | NONE | NONE |(1) 64K x|(1) 32K x|
| | x 8 | | | | 1 | 8 |
|-----+--------+-------+--------+--------+---------+---------|
|256KB|(4) 32K |(4) 32K|(1) 16K |(1) 16K |(1) 64K x| NONE |
| | x 8 | x 8 | x 4 | x 4 | 1 | |
|-----+--------+-------+--------+--------+---------+---------|
|512KB|(4) 128K| NONE | NONE | NONE |(1) 64K x|(1) 32K x|
| | x 8 | | | | 1 | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J15 | J16 | J17 | J18 | J19 | J20 | J21 | J22 |
|-------+------+------+------+------+------+-----+-----+-----|
| 64KB | 1 & | 1 & | 1 & | 1 & | 1 & | 1 & | 2 & | 3 & |
| | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 4 |
|-------+------+------+------+------+------+-----+-----+-----|
| 128KB | 2 & | 1 & | 1 & | 2 & | 1 & | 1 & | 1 & | 4 & |
| | 3 | 2 | 2 | 3 | 2 | 2 | 2 | 5 |
|-------+------+------+------+------+------+-----+-----+-----|
| 256KB | 2 & | 2 & | 1 & | 1 & | 1 & | 1 & | 1 & | 1 & |
| | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 |
|-------+------+------+------+------+------+-----+-----+-----|
| 512KB | 2 & | 2 & | 2 & | 2 & | 2 & | 2 & | 1 & | 4 & |
| | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 5 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J7 | J10 |
|--------------------+-------------------+-------------------|
| 25MHz | Closed | Closed |
|--------------------+-------------------+-------------------|
| 33MHz | Open | Closed |
|--------------------+-------------------+-------------------|
| 50i MHz | Closed | Closed |
|--------------------+-------------------+-------------------|
| 50MHz | Open | Open |
|--------------------+-------------------+-------------------|
| 66i MHz | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| U1 | U2 | JP1 | JP2 | JP3 |
|---------+----------+------------+------------+-------------|
| 80486SX | NONE | pins 1 & 2 | pins 3 & 4 | pins 2 & 3 |
| | | closed | closed | closed |
|---------+----------+------------+------------+-------------|
| NONE | 80486SX | pins 1 & 2 | pins 3 & 4 | pins 2 & 3 |
| | | closed | closed | closed |
|---------+----------+------------+------------+-------------|
| NONE | 80486DX | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed | and 3 & 4 |
| | | | | closed |
|---------+----------+------------+------------+-------------|
| NONE | 80486DX2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed | and 3 & 4 |
| | | | | closed |
|---------+----------+------------+------------+-------------|
| 80486SX | 80487SX | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed | and 3 & 4 |
| | | | | closed |
|---------+----------+------------+------------+-------------|
| 80486SX | 80486DX | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed | and 3 & 4 |
| | | | | closed |
|---------+----------+------------+------------+-------------|
| 80486SX | 80486DX2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed | and 3 & 4 |
| | | | | closed |
|---------+----------+------------+------------+-------------|
| 80486SX | ODP486SX | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | | closed | closed | and 3 & 4 |
| | | | | closed |
+------------------------------------------------------------+