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# UNIDENTIFIED
M-421
Processor 80486SX/80486DX/80486DX2
Processor Speed 25/33/50(internal)/66(internal)MHz
Chip Set PC Chips
Video Chip Set None
Maximum Onboard Memory 32MB
Maximum Video Memory None
Cache None
BIOS AMI
Dimensions 220mm x 220mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Speaker | J1 | Turbo switch | J4 |
|-------------------+----------+------------------+----------|
| Power LED & | J2 | Reset switch | J5 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Turbo LED | J3 | External battery | JP4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|------------------------------------+-------+---------------|
| | Battery type select internal | JP4 | Pins 2 & 3 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Battery type select external | JP4 | Open |
|---+--------------------------------+-------+---------------|
| | CMOS memory clear | JP4 | Pins 3 & 4 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| ยป | Monitor type select monochrome | JP5 | Open |
|---+--------------------------------+-------+---------------|
| | Monitor type select color | JP5 | 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | None |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP1 | JP2 |
|------------------+--------------------+--------------------|
| 80486SX | Pins 1 & 2 closed | Open |
|------------------+--------------------+--------------------|
| 80486DX | Pins 2 & 3 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486DX2 | Pins 2 & 3 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NPU SELECTION |
|------------------------------------------------------------|
| Note: To install a 4167 NPU, install the Math Coprocessor |
| Daughterboard over the CPU socket. |
+------------------------------------------------------------+