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# MICRONICS COMPUTERS, INC.
EISA 3 VL-BUS SYSTEM BOARD
Processor 80486SX/80487SX/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set Micronics
Max. Onboard 64MB
DRAM
Cache 64/128/256/512KB
BIOS Phoenix
Dimensions 355mm x 304mm
I/O Options 32-bit VESA local bus slots (2), floppy drive
interface, IDE interface,
parallel port, serial ports (2)
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Hard drive LED | CN1 | Parallel port | J30 |
|---------------------+----------+----------------+----------|
| External battery | J3 | Floppy drive | J31 |
| | | interface | |
|---------------------+----------+----------------+----------|
| Turbo switch | J4 | IDE interface | J32 |
|---------------------+----------+----------------+----------|
| Turbo LED | J5 | Serial port 1 | J33 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J8 | Serial port 2 | J34 |
|---------------------+----------+----------------+----------|
| Speaker | J10 | 32-bit VESA | S1 |
| | | Local bus slot | |
|---------------------+----------+----------------+----------|
| Reset switch | J11 | 32-bit VESA | S2 |
| | | Local bus slot | |
|---------------------+----------+----------------+----------|
| External keyboard | J13 | | |
| connector | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | W1 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | W7 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | W7 | Open |
|---+----------------------------------+--------+------------|
| » | AT style keyboard | W16 | Open |
|---+----------------------------------+--------+------------|
| | PS/2 style keyboard | W16 | Closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | W17 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | W17 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Real Time Clock memory normal | W18 | Open |
| | operation | | |
|---+----------------------------------+--------+------------|
| | Real Time Clock memory clear | W18 | Closed |
|------------------------------------------------------------|
| Note: W18 may not appear on the system mainboard, |
| depending upon the clock chip installed. If W18 is |
| present, use it instead of W17. The location of W18 is |
| unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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/U42|TAG/U43|TAG/U44|TAG/U45 |
|-----+------------+--------+-------+-------+-------+--------|
|64KB | (4) 8K x 8 |(4) 8K x| NONE | NONE |(1) 64K|(1) 8K x|
| | | 8 | | | x 8 | 8 |
|-----+------------+--------+-------+-------+-------+--------|
|128KB|(4) 32K x 8 | NONE | NONE | NONE |(1) 64K|(1) 8K x|
| | | | | | x 8 | 8 |
|-----+------------+--------+-------+-------+-------+--------|
|256KB|(4) 32K x 8 |(4) 32K |(1) 16K|(1) 16K|(1) 64K| NONE |
| | | x 8 | x1 | x1 | x 8 | |
|-----+------------+--------+-------+-------+-------+--------|
|512KB|(4) 128K x 8| NONE | NONE | NONE |(1) 64K|(1) 32K |
| | | | | | x 8 | x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W8 | W9 | W10 | W11 | W12 | W13 | W14 | W15 |
|-------+-----+-----+------+------+------+------+------+-----|
| 64KB | 1 & | 1 & | 1 & | 1 & | 1 & | 1 & | 3 & | 2 & |
| | 2 | 2 | 2 | 2 | 2 | 2 | 4 | 3 |
|-------+-----+-----+------+------+------+------+------+-----|
| 128KB | 2 & | 1 & | 1 & | 2 & | 1 & | 1 & | 4 & | 1 & |
| | 3 | 2 | 2 | 3 | 2 | 2 | 5 | 2 |
|-------+-----+-----+------+------+------+------+------+-----|
| 256KB | 2 & | 2 & | 1 & | 2 & | 2 & | 1 & | 1 & | 1 & |
| | 3 | 3 | 2 | 3 | 3 | 2 | 2 | 2 |
|-------+-----+-----+------+------+------+------+------+-----|
| 512KB | 2 & | 2 & | 2 & | 2 & | 2 & | 2 & | 4 & | 1 & |
| | 3 | 3 | 3 | 3 | 3 | 3 | 5 | 2 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| U1 | U2 | W2 | W5 | W6 |
|----------------+----------+----------+----------+----------|
| None | 80486SX | pins 1 & | pins 1 & | None |
| | (PQFP) | 2 | 2 | |
|----------------+----------+----------+----------+----------|
| 80486SX | None | pins 1 & | pins 2 & | pins 2 & |
| | | 2 | 3 | 3 |
|----------------+----------+----------+----------+----------|
| 80487SX | 80486SX | pins 1 & | pins 2 & | pins 1 & |
| | (PQFP) | 2 | 3 | 2, 3 & 4 |
|----------------+----------+----------+----------+----------|
| 80487SX | None | pins 1 & | pins 2 & | pins 1 & |
| | | 2 | 3 | 2, 3 & 4 |
|----------------+----------+----------+----------+----------|
| 80486DX | 80486SX | pins 2 & | pins 1 & | pins 1 & |
| | (PQFP) | 3 | 2 | 2, 3 & 4 |
|----------------+----------+----------+----------+----------|
| 80486DX | None | pins 2 & | pins 1 & | pins 1 & |
| | | 3 | 2 | 2, 3 & 4 |
|----------------+----------+----------+----------+----------|
| 80486DX2 | 80486SX | pins 1 & | pins 2 & | pins 1 & |
| | (PQFP) | 2 | 3 | 2, 3 & 4 |
|----------------+----------+----------+----------+----------|
| 80486DX2 | None | pins 1 & | pins 1 & | pins 1 & |
| | | 2 | 2 | 2, 3 & 4 |
|----------------+----------+----------+----------+----------|
| Pentium | None | pins 2 & | pins 2 & | pins 1 & |
| Overdrive | | 3 | 3 | 2, 3 & 4 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU | Speed | W3 |
|--------------------+--------------------+------------------|
| 80486SX/80486DX | 25MHz | On |
|--------------------+--------------------+------------------|
| 80486SX/80486DX | 33MHz | Off |
|--------------------+--------------------+------------------|
| 80486DX2 | 50i MHz | On |
|--------------------+--------------------+------------------|
| 80486DX2 | 66i MHz | Off |
+------------------------------------------------------------+