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# UNIDENTIFIED
486NL
Processor CX486S/80486SX/CX486DX/80486DX/CX486DX2/80486DX2/Pentium
Overdrive
Processor 20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set OPTI
Max. 32MB
Onboard
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 220mm
I/O 32-bit VESA local bus slots (2)
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | J6 | Speaker | J24 |
|-------------------+----------+------------------+----------|
| Power LED & | J20 | Turbo switch | JJ23 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Reset switch | J22 | 32-bit VESA | SL1 & |
| | | local bus slots | SL2 |
|-------------------+----------+------------------+----------|
| Turbo LED | J23 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | J1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | J1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | J3 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | J3 | Open |
|---+--------------------------------+--------+--------------|
| » | Cyrix CPU type select CX486DX2 | J19 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Cyrix CPU type select CX486DX | J19 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | CPU type select Intel | J21 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CPU type select Cyrix | J21 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | CPU type select PGA | J29 | Closed |
|---+--------------------------------+--------+--------------|
| | CPU type select PQFP | J29 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 (U25) | TAG (U26) |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 8K x 8 | (1) 8K x 8 |
| | | 8 | | |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 32K x | NONE |
| | | 8 | 8 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J8 | J9 | J10 | J14 |
|-------+-----------------+--------+----------------+--------|
| 64KB | pins 2 & 3 | Open | pins 1 & 2 | Open |
| | closed | | closed | |
|-------+-----------------+--------+----------------+--------|
| 128KB | pins 1 & 2 | Closed | pins 2 & 3 | Open |
| | closed | | closed | |
|-------+-----------------+--------+----------------+--------|
| 256KB | pins 2 & 3 | Closed | pins 1 & 2 | Closed |
| | closed | | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J11 | J12 | J13 |
|----------+-------------------+---------+-------------------|
| 80486SX | pins 1 & 2 closed | Open | pins 2 & 3 closed |
|----------+-------------------+---------+-------------------|
| 80486DX | pins 2 & 3 closed | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J15 | J16 | J17 | J18 |
|--------+--------+--------+----------------+----------------|
| 25MHz | Closed | Open | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
|--------+--------+--------+----------------+----------------|
| 33MHz | Open | Closed | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
|--------+--------+--------+----------------+----------------|
| 40MHz | Closed | Closed | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
|--------+--------+--------+----------------+----------------|
| 50iMHz | Closed | Open | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
|--------+--------+--------+----------------+----------------|
| 50MHz | Closed | Open | pins 2 & 3 | pins 1 & 2 |
| | | | closed | closed |
|--------+--------+--------+----------------+----------------|
| 66iMHz | Open | Closed | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | J28 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | J25 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+