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# UNIDENTIFIED
486SX/DX/DX2-MAINBOARD
Processor 80486SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set UNI
Video Chip Set None
Maximum Onboard 32MB
Memory
Maximum Video Memory None
Cache 64/128/256KB
BIOS AMI
Dimensions 260mm x 220mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Turbo switch | H1 | Reset switch | H5 |
|---------------+----------+----------------------+----------|
| Turbo LED | H2 | External battery | J1 |
|---------------+----------+----------------------+----------|
| Power LED & | H3 | 32-bit VESA local | SL1 - |
| keylock | | bus slots | SL3 |
|---------------+----------+----------------------+----------|
| Speaker | H4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | Turbo enabled | H1 | Closed |
|---+-----------------------------------+-------+------------|
| | Turbo enabled through keyboard | H1 | Open |
| | (CTRL, ALT, +) | | |
|---+-----------------------------------+-------+------------|
| | Turbo disabled through keyboard | H1 | Open |
| | (CTRL, ALT, -) | | |
|---+-----------------------------------+-------+------------|
| » | CMOS memory normal operation | J1 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | J1 | Pins 3 & 4 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Battery type select external | J1 | Closed |
|---+-----------------------------------+-------+------------|
| » | Monitor type select color | J3 | Closed |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | J3 | Open |
|---+-----------------------------------+-------+------------|
| » | VL-BUS clock normal operation | JP43 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | VL-BUS clock adjusted | JP43 | Pins 1 & 2 |
| | | | 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 |
|------------+---------------+---------------+---------------|
| 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 CONFIGURATION |
|------------------------------------------------------------|
| Size | JP6 | JP7 | JP8 | JP9 |
|-------+--------+--------+--------+-------------------------|
| 64KB | Open | Closed | Open | Pins 1 & 2 closed |
|-------+--------+--------+--------+-------------------------|
| 128KB | Open | Closed | Closed | Pins 1 & 2, 3 & 4 |
| | | | | closed |
|-------+--------+--------+--------+-------------------------|
| 256KB | Closed | Closed | Closed | Pins 1 & 2, 4 & 5 |
| | | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP29 | JP30 | JP31 |
|---------------+--------------+--------------+--------------|
| 20MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP4 |
|--------------------------+---------------------------------|
| 80486SX | Pins 5 & 6 closed |
|--------------------------+---------------------------------|
| 80486DX | Pins 1 & 2, 4 & 5, 6 & 7 closed |
|--------------------------+---------------------------------|
| 80486DX2 | Pins 1 & 2, 4 & 5, 6 & 7 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS WAIT STATE SELECTION |
|------------------------------------------------------------|
| Setting | JP20 |
|---------------------------------+--------------------------|
| | 0 | Open |
|--------+------------------------+--------------------------|
| » | 1 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP19 |
|---------------------------------+--------------------------|
| | <= 33MHz | Open |
|----+----------------------------+--------------------------|
| » | >33 MHz | Closed |
+------------------------------------------------------------+