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# ILON USA, INC.
M-423
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)MHz
Chip Set PC Chips
Max. Onboard DRAM 32MB
Cache 32/64/128/256KB
BIOS AMI
Dimensions 220mm x 220mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | JP1 | Power LED & | JP20 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Reset switch | JP17 | Speaker | JP21 |
|------------------+----------+-------------------+----------|
| Turbo LED | JP18 | Weitek 4167 | W1 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Turbo switch | JP19 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor type select color | JP2 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP2 | Open |
|---+--------------------------------+--------+--------------|
| » | Gate type select fast A20 | JP3 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Gate type select keyboard A20 | JP3 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | None |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | None |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | None |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 32KB | (4) 8K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER WRITE-THROUGH CONFIGURATION |
|------------------------------------------------------------|
| Size | JP4 | JP6 | JP11 | JP12 | JP13 |
|----------+---------+---------+---------+---------+---------|
| 32KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|----------+---------+---------+---------+---------+---------|
| 64KB | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
|----------+---------+---------+---------+---------+---------|
| 128KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+---------+---------+---------+---------+---------|
| 256KB | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER WRITE-BACK CONFIGURATION |
|------------------------------------------------------------|
| Size | JP7 | JP8 | JP9 | JP10 |
|------------+------------+-----------+-----------+----------|
| 32KB | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------+------------+-----------+-----------+----------|
| 64KB | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
|------------+------------+-----------+-----------+----------|
| 128KB | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 |
|------------+------------+-----------+-----------+----------|
| 256KB | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP14 | JP15 | JP16 |
|----------+------------+------------+-----------------------|
| 80486SX | pins 2 & 3 | Open | pins 2 & 3 closed |
| | closed | | |
|----------+------------+------------+-----------------------|
| 80487SX | pins 1 & 2 | pins 2 & 3 | pins 1 & 2, 3 & 4 |
| | closed | closed | closed |
|----------+------------+------------+-----------------------|
| 80486DX | pins 1 & 2 | pins 1 & 2 | pins 1 & 2, 3 & 4 |
| | closed | closed | closed |
|----------+------------+------------+-----------------------|
| 80486DX2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2, 3 & 4 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP5 |
|----------------------------+-------------------------------|
| 20MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 25MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 50iMHz | pins 2 & 3 closed |
+------------------------------------------------------------+