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# UNIDENTIFIED
U486 (ML-U486DX50/33HS/V1)
Processor 80486SX/80487SX/80486DX
Processor Speed 33/50MHz
Chip Set UMC
Video Chip Set None
Maximum Onboard Memory 32MB
Maximum Video Memory None
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J3 | Turbo LED | J11 |
|---------------------+----------+----------------+----------|
| Speaker | J8 | Reset switch | J12 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J9 | Turbo switch | JP1 |
|---------------------+----------+----------------+----------|
| Turbo switch | J10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Battery type select internal | J1 | Closed |
|---+---------------------------------+-------+--------------|
| | Battery type select external | J1 | Open |
|---+---------------------------------+-------+--------------|
| » | NPU synchronous with CPU | J5 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | NPU asynchronous with CPU | J5 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Monitor type select color | J6 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | J6 | Open |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | J7 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | J13 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | J13 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W4 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION (33MHZ CPU) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|----------+----------------+----------------+---------------|
| 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 |
|------------------------------------------------------------|
| Note: The location of banks 0 & 1 are unidentified. |
| The speed for the cache is 15ns and 25ns for the TAG. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION (50MHZ CPU) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|----------+----------------+----------------+---------------|
| 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 |
|------------------------------------------------------------|
| Note: The location of banks 0 & 1 are unidentified. |
| The speed for the cache is 15ns and 20ns for the TAG. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W1 | W2 | W3 | W5 | W6 | W7 | W8 | W9 |
|------+------+------+-----+-----+------+------+------+------|
| 64KB |1 & 2 | Open |1 & 2|1 & 2| Open | Open | Open | Open |
|------+------+------+-----+-----+------+------+------+------|
|128KB |2 & 3 |1 & 2 |1 & 2|2 & 3|Closed| Open | Open |Closed|
|------+------+------+-----+-----+------+------+------+------|
|256KB |1 & 2 |2 & 3 |2 & 3|2 & 3|Closed|Closed|Closed|Closed|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK SELECTION |
|------------------------------------------------------------|
| Setting | W10 |
|-------------------------------+----------------------------|
| 1x | Open |
|-------------------------------+----------------------------|
| 2x | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | W11 | W12 |
|------------+--------------------------+--------------------|
| 80486SX | Pins 2 & 3 closed | Open |
|------------+--------------------------+--------------------|
| 80487SX | Pins 1 & 2, 3 & 4 closed | Pins 2 & 3 closed |
|------------+--------------------------+--------------------|
| 80486DX | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TURBO SELECTION |
|------------------------------------------------------------|
| Setting | J10 | JP1 |
|--------------------+-------------------+-------------------|
| Enabled | Closed | Open |
|--------------------+-------------------+-------------------|
| Disabled | Open | Closed |
+------------------------------------------------------------+