(TXT) View Source
# CHAINTECH COMPUTER COMPANY, LTD.
VESA MAINBOARD SIS 486 (REV. 2)
Processor 80486SX/CX486M7/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set SIS
Max. Onboard 128MB
DRAM
Cache 128/256/512KB
BIOS AMI/Award
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (3), green PC
connector
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J1 | Reset switch | J6 |
|------------------+----------+-------------------+----------|
| Turbo switch | J3 | Power LED & | J7 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo LED | J4 | Green PC | JP26 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Speaker | J5 | 32-bit VESA local | SL1 - |
| | | bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | SMOUT type select normal mode | J2 | Closed |
|---+----------------------------------+--------+------------|
| | SMOUT type select standby mode | J2 | Open |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP16 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP16 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | Open |
| | 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 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 65MB | (4) 256K x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 68MB | (4) 1M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 80MB | (4) 4M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 | JP3 | JP4 |
|-------+------------+------------+-------------+------------|
| 128KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2, | pins 1 & 2 |
| | closed | closed | 3 & 4 | closed |
| | | | closed | |
|-------+------------+------------+-------------+------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3, | pins 1 & 2 |
| | closed | closed | 4 & 5 | closed |
| | | | closed | |
|-------+------------+------------+-------------+------------|
| 512KB | pins 1 & 2 | pins 2 & 3 | pins 1 & 2, | pins 2 & 3 |
| | closed | closed | 3 & 4 | closed |
| | | | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP8 | JP9 | JP10 | JP11 | JP12 |JP13 |JP14 |
|------------+------+-------+------+------+------+-----+-----|
| 80486SX |2 & 3 | Open |2 & 3 | Open |3 & 4 |1 & 2|2 & 3|
|------------+------+-------+------+------+------+-----+-----|
| CX486M7 |1 & 2 |Closed |2 & 3 |2 & 3 |2 & 3 |Open |1 & 2|
|------------+------+-------+------+------+------+-----+-----|
|80486DX/DX2 |1 & 2 |Closed |2 & 3 |2 & 3 |3 & 4 |1 & 2|2 & 3|
|------------+------+-------+------+------+------+-----+-----|
| P23S |2 & 3 | Open |2 & 3 | Open |3 & 4 |1 & 2|2 & 3|
|------------+------+-------+------+------+------+-----+-----|
| P24D |1 & 2 |Closed |1 & 2 |2 & 3 |1 & 2 |2 & 3|2 & 3|
|------------+------+-------+------+------+------+-----+-----|
| P24S |1 & 2 |Closed |2 & 3 |2 & 3 |3 & 4 |1 & 2|2 & 3|
|------------+------+-------+------+------+------+-----+-----|
| P24T |1 & 2 |Closed |1 & 2 |1 & 2 |3 & 4 |Open |1 & 2|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP15 | JP21 | JP22 | JP24 | JP25 | JP30 |
|-------------+-------+-------+-------+------+------+--------|
| 80486SX | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open | Open |
|-------------+-------+-------+-------+------+------+--------|
| CX486M7 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & | 2 & | Open |
| | | | | 3 | 3 | |
|-------------+-------+-------+-------+------+------+--------|
| 80486DX/DX2 | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open | Open |
|-------------+-------+-------+-------+------+------+--------|
| P23S | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open | Open |
|-------------+-------+-------+-------+------+------+--------|
| P24D | 4 & 5 | 2 & 3 | 1 & 2 | Open | 1 & | Closed |
| | | | | | 2 | |
|-------------+-------+-------+-------+------+------+--------|
| P24S | 4 & 5 | 2 & 3 | 1 & 2 | Open | Open | Open |
|-------------+-------+-------+-------+------+------+--------|
| P24T | 1 & 2 | 1 & 2 | 1 & 2 | 1 & | 1 & | Open |
| | | | | 2 | 2 | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP5 | JP6 | JP7 |
|---------------+--------------+--------------+--------------|
| 25MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 40MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 50iMHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK DELAY CONFIGURATION |
|------------------------------------------------------------|
| Delay | JP20 |
|-------------------------------+----------------------------|
| 0 delay | pins 1 & 2 closed |
|-------------------------------+----------------------------|
| 1 gate buffer delay | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU INPUT FREQUENCY CONFIGURATION |
|------------------------------------------------------------|
| input | JP23 |
|----------------------------+-------------------------------|
| Single input | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Double input | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP28 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP29 |
|----------------------------+-------------------------------|
| <= 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+