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# UNIDENTIFIED
80486 MOTHERBOARD
Processor CX486S/80486SX/80487SX/80486DX/80486DX2/80486DX4
Processor 25/33/40/50/50i/66i/75i/100iMHz
Speed
Chip Set Unidentified
Max. Onboard 64MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 250mm x 220mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| CPU power board | J10 | Turbo LED | JP18 |
|------------------+----------+-------------------+----------|
| External battery | JP1 | Reset switch | JP19 |
|------------------+----------+-------------------+----------|
| Power LED & | JP16 | Turbo switch | JP20 |
| Keylock | | | |
|------------------+----------+-------------------+----------|
| Speaker | JP17 | 32-bit VESA local | SL1-SL3 |
| | | bus slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | VL-bus card select general | JP2 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | VL-bus card select Power 9000 | JP2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | 80486DX4 power board voltage | JP4 | Open |
| | select 3.45 | | |
|---+----------------------------------+--------+------------|
| | 80486DX4 power board voltage | JP4 | Closed |
| | select 5 | | |
|---+----------------------------------+--------+------------|
| » | 80486DX4 clock speed select | JP28 | Closed |
| | tripled | | |
|---+----------------------------------+--------+------------|
| | 80486DX4 clock speed select | JP28 | Open |
| | doubled | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | 256K |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Tag (U28) | Tag (U29) |
|-------+---------+---------+----------------+---------------|
| 64KB | (4) 8K | (4) 8K | (1) 8K x 8 | NONE |
| | x 8 | x 8 | | |
|-------+---------+---------+----------------+---------------|
| 128KB | (4) 32K | NONE | (1) 8K x 8 | NONE |
| | x 8 | | | |
|-------+---------+---------+----------------+---------------|
| 256KB | (4) 32K | (4) 32K | (1) 8K x 8 or | (1) 8K x 8 or |
| | x 8 | x 8 | (1) 32K x 8 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP9 | JP10 | JP11 | JP12 |
|-------+-----------------+----------------+--------+--------|
| 64KB | pins 1 & 2 | Open | Open | Open |
| | closed | | | |
|-------+-----------------+----------------+--------+--------|
| 128KB | pins 2 & 3 | pins 2 & 3 | Closed | Open |
| | closed | closed | | |
|-------+-----------------+----------------+--------+--------|
| 256KB | pins 1 & 2 | pins 1 & 2 | Closed | Closed |
| | closed | closed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK SPEED CONFIGURATION (MX8310) |
|------------------------------------------------------------|
| Speed | JP13 | JP14 | JP15 |
|---------------+---------------+--------------+-------------|
| 25MHz | Closed | Open | Open |
|---------------+---------------+--------------+-------------|
| 33MHz | Closed | Closed | Closed |
|---------------+---------------+--------------+-------------|
| 40MHz | Closed | Closed | Open |
|---------------+---------------+--------------+-------------|
| 50MHz | Open | Open | Closed |
|---------------+---------------+--------------+-------------|
| 50i MHz | Closed | Open | Open |
|---------------+---------------+--------------+-------------|
| 66i MHz | Closed | Closed | Closed |
|---------------+---------------+--------------+-------------|
| 75i MHz | Closed | Open | Open |
|---------------+---------------+--------------+-------------|
| 100i MHz | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK SPEED CONFIGURATION (KTS0802C/PLL52C05) |
|------------------------------------------------------------|
| Speed | JP13 | JP14 | JP15 |
|---------------+---------------+--------------+-------------|
| 25MHz | Closed | Closed | Open |
|---------------+---------------+--------------+-------------|
| 33MHz | Open | Closed | Open |
|---------------+---------------+--------------+-------------|
| 40MHz | Closed | Open | Closed |
|---------------+---------------+--------------+-------------|
| 50MHz | Closed | Open | Open |
|---------------+---------------+--------------+-------------|
| 50i MHz | Closed | Closed | Open |
|---------------+---------------+--------------+-------------|
| 66i MHz | Open | Closed | Open |
|---------------+---------------+--------------+-------------|
| 75i MHz | Closed | Closed | Open |
|---------------+---------------+--------------+-------------|
| 100i MHz | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECT |
|------------------------------------------------------------|
| Type | JP5-JP8 | JP22 | JP23 |
|------------+----------+----------------------+-------------|
| CX 486S | Closed | pins 2 & 3 closed | Open |
|------------+----------+----------------------+-------------|
| 80486SX | Closed | pins 2 & 3 closed | Open |
|------------+----------+----------------------+-------------|
| 80487SX | Closed | pins 1 & 2,3 & 4 | pins 2 & 3 |
| | | closed | closed |
|------------+----------+----------------------+-------------|
| 486DX/DX2 | Closed | pins 1 & 2,3 & 4 | pins 1 & 2 |
| | | closed | closed |
|------------+----------+----------------------+-------------|
| 80486DX4 | Open | pins 1 & 2,3 & 4 | pins 1 & 2 |
| | | closed | closed |
|------------------------------------------------------------|
| Note: Using 80486DX4, CPU power board (optional) must be |
| in J10. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP21 |
|-------------------------------+----------------------------|
| 25MHz | Open |
|-------------------------------+----------------------------|
| 33MHz | Open |
|-------------------------------+----------------------------|
| 40MHz | Open |
|-------------------------------+----------------------------|
| 50MHz | Closed |
|-------------------------------+----------------------------|
| 50i MHz | Open |
|-------------------------------+----------------------------|
| 66i MHz | Open |
|-------------------------------+----------------------------|
| 75i MHz | Open |
|-------------------------------+----------------------------|
| 100i MHz | Closed |
+------------------------------------------------------------+