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# CHAINTECH COMPUTER COMPANY, LTD.
416SX/420SX/425SX/433SC/450SC
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 16/20/25/33/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 64MB
Cache 32/64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Reset switch | J1 | Speaker | J4 |
|----------------+----------+---------------------+----------|
| Turbo switch | J2 | Power LED & keylock | J5 |
|----------------+----------+---------------------+----------|
| Turbo LED | J3 | External battery | J7 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Turbo enabled | J2 | Closed |
|---+----------------------------------+--------+------------|
| | Turbo disabled | J2 | Open |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | J6 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | J6 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP7 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP17 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP17 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | Open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 6MB | (4) 256K x | (4) 256K x | (1) 1M x | NONE |
| | 9 | 9 | 36 | |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 10MB | (4) 256K x | (4) 256K x | (1) 1M x | (1) 1M x |
| | 9 | 9 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (4) 1M x 9 | (4) 1M x 9 |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 18MB | (4) 256K x | (4) 256K x | (1) 4M x | NONE |
| | 9 | 9 | 36 | |
|------+-------------+-------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 36 | (1) 1M x 36 | (4) 1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 1M x 36 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 36MB | (4) 4M x 9 | (4) 4M x 9 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 36 | (1) 4M x 36 | (4) 1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (4) 4M x 9 | (4) 4M x 9 |
|------+-------------+-------------+------------+------------|
| 40MB | (4) 4M x 9 | (4) 4M x 9 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 4M x 36 | (4) 1M x 9 | (4) 1M x 9 |
|------+-------------+-------------+------------+------------|
| 40MB | (4) 1M x 9 | (4) 1M x 9 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP20 | JP21 |
|-----------+-------------+------------+----------+----------|
| Option 1 | pins 1 & 2 | pins 1 & 2 | pins 1 & | pins 1 & |
| | closed | closed | 2 closed | 2 closed |
|-----------+-------------+------------+----------+----------|
| Option 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & | pins 2 & |
| | closed | closed | 3 closed | 3 closed |
|------------------------------------------------------------|
| Note: Option 1- Banks 0 & 1 use x 9 SIMMS and Banks 2 & 3 |
| use X 36 SIMMS. |
| |
| Option 2- Banks 0 & 1 use x 36 SIMMS and Banks 2 & 3 use X |
| 9 SIMMS. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 32KB | (4) 8K x 8 | NONE |
|------------------+--------------------+--------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | NONE |
|------------------+--------------------+--------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 | JP11 |
|-------+-------------+------------+------------+------------|
| 32KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 64KB | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 128KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Size | JP12 | JP13 | JP14 | JP15 | JP16 |
|----------+----------+----------+---------+--------+--------|
| 32KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 64KB | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 128KB | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
|----------+----------+----------+---------+--------+--------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP4 | JP5 | JP6 |
|-----------+-------------------+--------+-------------------|
| 80486SX | pins 2 & 3 closed | Open | Open |
|-----------+-------------------+--------+-------------------|
| ODP486SX | pins 1 & 2 closed | Closed | pins 2 & 3 closed |
|-----------+-------------------+--------+-------------------|
| 80487SX | pins 1 & 2 closed | Closed | pins 2 & 3 closed |
|-----------+-------------------+--------+-------------------|
| 80486DX | pins 1 & 2 closed | Closed | pins 1 & 2 closed |
|-----------+-------------------+--------+-------------------|
| 80486DX2 | pins 1 & 2 closed | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP3 |
|----------------------------+-------------------------------|
| 16MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 20MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| > 25MHz | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note:Depending on board version, cache and accompanying |
| jumpers may not be present. |
+------------------------------------------------------------+