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# UNIDENTIFIED
SIS 486
Processor CX486SX/80486SX/80487SX/CX486DX/80486DX/80486DX2
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set SIS
Max. Onboard 64MB
DRAM
Cache 128/256KB
BIOS AMI
Dimensions 254mm x 220mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+-----------+----------------+-----------|
| Auxiliary | CN1 | Turbo switch | JP22 pins |
| keyboard | | | 15 - 17 |
| connector | | | |
|-------------------+-----------+----------------+-----------|
| External battery | CN3 | Reset switch | JP22 pins |
| | | | 19 - 20 |
|-------------------+-----------+----------------+-----------|
| Power LED & | JP22 pins | Bus mouse port | JP22 pins |
| keylock | 1 - 5 | | 19 - 20 |
|-------------------+-----------+----------------+-----------|
| Speaker | JP22 pins | 32-bit VESA | SL1 - SL3 |
| | 6 - 10 | local bus | |
| | | slots | |
|-------------------+-----------+----------------+-----------|
| Turbo LED | JP22 pins | | |
| | 12 - 13 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Battery type select internal | CN3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | CN3 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JGPC | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP1 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP1 | Closed |
|---+----------------------------------+--------+------------|
| » | PQFP CPU disabled | JP5 | Closed |
|---+----------------------------------+--------+------------|
| | PQFP CPU enabled | JP5 | Open |
|---+----------------------------------+--------+------------|
| » | CPU speed select 50MHz (Cyrix | JP6 | pins 1 & 2 |
| | only) | | closed |
|---+----------------------------------+--------+------------|
| | CPU speed select <50MHz (Cyrix | JP6 | pins 2 & 3 |
| | only) | | closed |
|---+----------------------------------+--------+------------|
| » | CPU type select all | JP16 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU type select 80486DX-40/50 | JP16 | pins 1 & 2 |
| | only | | closed |
|---+----------------------------------+--------+------------|
| » | VESA card select normal | JP23 | Open |
|---+----------------------------------+--------+------------|
| | VESA card select Genoa | JP23 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 4MB | (4) 256K x 9 | (1) 256K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | NONE | (1) 512K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (1) 512K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (4) 4M x 9 | (1) 512K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | NONE | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | JPA | JPB | JPC |
|------+-----------------+-----------------+-----------------|
| 4MB | pins 1 & 2 | pins 4 & 5 | pins 1 & 2 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 4MB | pins 2 & 3 | Open | Open |
| | closed | | |
|------+-----------------+-----------------+-----------------|
| 8MB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 20MB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 4MB | Open | Open | pins 2 & 3 |
| | | | closed |
|------+-----------------+-----------------+-----------------|
| 8MB | pins 2 & 3 | Open | Open |
| | closed | | |
|------+-----------------+-----------------+-----------------|
| 8MB | Open | pins 4 & 5 | pins 1 & 2 |
| | | closed | closed |
|------+-----------------+-----------------+-----------------|
| 12MB | pins 1 & 2 | pins 4 & 5 | pins 1 & 2 |
| | closed | closed | closed |
|------+-----------------+-----------------+-----------------|
| 16MB | Open | Open | Open |
|------+-----------------+-----------------+-----------------|
| 16MB | Open | Open | pins 2 & 3 |
| | | | closed |
|------+-----------------+-----------------+-----------------|
| 32MB | pins 2 & 3 | Open | Open |
| | closed | | |
|------+-----------------+-----------------+-----------------|
| 64MB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 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 | JP2 | JP3 | JP4 |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP12 | JP13 | JP15 |
|-----------+-------------------+-------------------+--------|
| 80486SX | Open | pins 2 & 3 closed | Open |
|-----------+-------------------+-------------------+--------|
| 80487SX | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
|-----------+-------------------+-------------------+--------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
|-----------+-------------------+-------------------+--------|
| 80486DX2 | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JS0 | JS1 | JS2 |
|-------------+-------------+------------+-------------------|
| 25MHz | Open | Open | Closed |
|-------------+-------------+------------+-------------------|
| 33MHz | Closed | Open | Open |
|-------------+-------------+------------+-------------------|
| 40MHz | Closed | Closed | Open |
|-------------+-------------+------------+-------------------|
| 50iMHz | Open | Open | Closed |
|-------------+-------------+------------+-------------------|
| 50MHz | Open | Closed | pins 1 & 2 closed |
|-------------+-------------+------------+-------------------|
| 66iMHz | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP8 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP9 |
|----------------------------+-------------------------------|
| <= 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+